[ruby-dev:52181] [Ruby Bug#21673] Segmentation Fault in IRB when refining `Kernel#puts` using `Module#refine` (Regression since Ruby 3.4)
Issue #21673 has been reported by yokomaru (Yoko Suzuki). ---------------------------------------- Bug #21673: Segmentation Fault in IRB when refining `Kernel#puts` using `Module#refine` (Regression since Ruby 3.4) https://bugs.ruby-lang.org/issues/21673 * Author: yokomaru (Yoko Suzuki) * Status: Open * ruby -v: ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- In the IRB environment running Ruby 3.4 and later, the VM crashes with a Segmentation Fault when a module refining `Kernel#puts` is defined and `puts` is subsequently executed. The crash does not occur when the exact same code is executed as a regular Ruby script. **Environment** Reproduced on multiple environments: ``` macOS 15.5 (Apple Silicon M1, MacBook Pro) - ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24] - ruby 3.5.0dev (2025-11-06 master cf4a034d59) +PRISM [arm64-darwin24] - irb 1.15.3 (also reproduced with 1.13.1) - Installed via rbenv ``` ``` Arch Linux (AArch64) - Linux 6.11.6-arch1-1 - ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [x86_64-linux] - irb 1.15.3 - Installed via mise ``` This does not occur on: Ruby 3.3.10 + IRB 1.13.1 **Steps to Reproduce (Reproduction Script)** The crash reproduces with these steps (on Ruby 3.4+): 1. Start irb. ```bash $ irb ``` 2. Define the refinement module for `Kernel#puts`. ```ruby module Foo refine Kernel do def puts end end end # Explicit 'using Foo' is NOT required ``` 3. Execute `puts` at the IRB prompt. ```ruby puts # ← Segmentation Fault occurs here ``` **Expected Result** As observed in Ruby 3.3.10, the IRB session should continue to operate normally. **Actual Result (Execution Log Excerpt)** The full crash logs (for macOS and Arch Linux) and the macOS crash report are provided in the attached files. ``` $ irb irb(main):001* module Foo irb(main):002* refine Kernel do irb(main):003* def puts irb(main):004* end irb(main):005* end irb(main):006> end => #<refinement:Kernel@Foo> irb(main):007> put/Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/context.rb:636: [BUG] Segmentation fault at 0x0000000000000030 ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24] puts -- Crash Report log information -------------------------------------------- See Crash Report log file in one of the following locations: * ~/Library/Logs/DiagnosticReports * /Library/Logs/DiagnosticReports for more details. Don't forget to include the above Crash Report log file in bug reports. -- Control frame information ----------------------------------------------- c:0049 p:---- s:0274 e:000273 CFUNC :public_method c:0048 p:---- s:0271 e:000270 CFUNC :bind_call c:0047 p:0221 s:0265 e:000264 METHOD /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/context.rb:636 c:0046 p:0034 s:0251 e:000250 METHOD /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/context.rb:648 c:0045 p:0010 s:0239 e:000238 BLOCK /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/input-method.rb:277 c:0044 p:0024 s:0233 e:000232 METHOD /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/reline-0.6.2/lib/reline/line_editor.rb:787 <...snip...> -- Ruby level backtrace information ---------------------------------------- /Users/USER/.rbenv/versions/3.4.7/bin/irb:25:in '<main>' /Users/USER/.rbenv/versions/3.4.7/bin/irb:25:in 'load' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/exe/irb:9:in '<top (required)>' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:54:in 'start' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:173:in 'run' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:173:in 'catch' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:174:in 'block in run' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:193:in 'eval_input' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:278:in 'each_top_level_statement' <internal:kernel>:168:in 'loop' <...snip...> -- C level backtrace information ------------------------------------------- /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_bugreport+0xb6c) [0x102ccdaa8] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_bug_for_fatal_signal+0x100) [0x102b07bfc] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(sigsegv+0x84) [0x102c2e2f4] /usr/lib/system/libsystem_platform.dylib(_sigtramp+0x38) [0x19e60c624] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_callable_method_entry_with_refinements+0xd8) [0x102caabb4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_callable_method_entry_with_refinements+0xd8) [0x102caabb4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(obj_method+0x160) [0x102bcbf74] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call0_body+0x35c) [0x102cc4b50] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_call_kw+0xc4) [0x102cae300] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x46c8) [0x102ca77f0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x1b4) [0x102ca1fa4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_yield+0xa8) [0x102cafa54] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_ary_each+0x40) [0x102a5b7f8] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x1b4) [0x102ca1fa4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_yield+0xa8) [0x102cafa54] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_protect+0xb0) [0x102b13918] /Users/USER/.rbenv/versions/3.4.7/lib/ruby/3.4.0/arm64-darwin24/io/console.bundle(ttymode+0x1e0) [0x102462ab4] /Users/USER/.rbenv/versions/3.4.7/lib/ruby/3.4.0/arm64-darwin24/io/console.bundle(ttymode) (null):0 /Users/USER/.rbenv/versions/3.4.7/lib/ruby/3.4.0/arm64-darwin24/io/console.bundle(console_raw+0x40) [0x102460ca0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x134) [0x102ca1f24] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_yield+0xa8) [0x102cafa54] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_ensure+0xac) [0x102b13a70] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x134) [0x102ca1f24] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(catch_i+0x6c) [0x102cc6d50] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_catch_protect+0xbc) [0x102cb1b70] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_f_catch+0x70) [0x102cb2560] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x1b4) [0x102ca1fa4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(load_iseq_eval+0x224) [0x102b73b50] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_load_internal+0x84) [0x102b70e8c] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_f_load+0x8c) [0x102b72aa0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x46c8) [0x102ca77f0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x134) [0x102ca1f24] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_ec_exec_node+0x8c) [0x102b12c14] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(ruby_run_node+0x40) [0x102b12b3c] /Users/USER/.rbenv/versions/3.4.7/bin/ruby(main+0x68) [0x1022c0618] ``` ---Files-------------------------------- backtrace_ruby-3.4.7_macos.txt (111 KB) backtrace_ruby-3.4.7_archlinux.txt (90.4 KB) macos_crash_report_ruby-3.4.7.ips.txt (31.4 KB) -- https://bugs.ruby-lang.org/
Issue #21673 has been updated by yokomaru (Yoko Suzuki). File backtrace_ruby-3.4.7_omarchy(archlinux).txt added File deleted (backtrace_ruby-3.4.7_archlinux.txt) Description updated I sincerely apologize, but I made an error in the entry regarding the second environment's information, so I have corrected it and re-uploaded the backtrace file. The file has been updated to reflect the correct distribution name. There are no changes to the other core information, such as the reproduction steps or the error information (Segmentation Fault) at the time of the crash. Thank you for your understanding. ---------------------------------------- Bug #21673: Segmentation Fault in IRB when refining `Kernel#puts` using `Module#refine` (Regression since Ruby 3.4) https://bugs.ruby-lang.org/issues/21673#change-115118 * Author: yokomaru (Yoko Suzuki) * Status: Open * ruby -v: ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- In the IRB environment running Ruby 3.4 and later, the VM crashes with a Segmentation Fault when a module refining `Kernel#puts` is defined and `puts` is subsequently executed. The crash does not occur when the exact same code is executed as a regular Ruby script. **Environment** Reproduced on multiple environments: ``` macOS 15.5 (Apple Silicon M1, MacBook Pro) - ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24] - ruby 3.5.0dev (2025-11-06 master cf4a034d59) +PRISM [arm64-darwin24] - irb 1.15.3 (also reproduced with 1.13.1) - Installed via rbenv ``` ``` Omarhy 3.1.3(Linux 6.17.5-arch1-1) - ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [x86_64-linux] - irb 1.15.3 - Installed via mise ``` This does not occur on: Ruby 3.3.10 + IRB 1.13.1 **Steps to Reproduce (Reproduction Script)** The crash reproduces with these steps (on Ruby 3.4+): 1. Start irb. ```bash $ irb ``` 2. Define the refinement module for `Kernel#puts`. ```ruby module Foo refine Kernel do def puts end end end # Explicit 'using Foo' is NOT required ``` 3. Execute `puts` at the IRB prompt. ```ruby puts # ← Segmentation Fault occurs here ``` **Expected Result** As observed in Ruby 3.3.10, the IRB session should continue to operate normally. **Actual Result (Execution Log Excerpt)** The full crash logs (for macOS and Arch Linux) and the macOS crash report are provided in the attached files. ``` $ irb irb(main):001* module Foo irb(main):002* refine Kernel do irb(main):003* def puts irb(main):004* end irb(main):005* end irb(main):006> end => #<refinement:Kernel@Foo> irb(main):007> put/Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/context.rb:636: [BUG] Segmentation fault at 0x0000000000000030 ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24] puts -- Crash Report log information -------------------------------------------- See Crash Report log file in one of the following locations: * ~/Library/Logs/DiagnosticReports * /Library/Logs/DiagnosticReports for more details. Don't forget to include the above Crash Report log file in bug reports. -- Control frame information ----------------------------------------------- c:0049 p:---- s:0274 e:000273 CFUNC :public_method c:0048 p:---- s:0271 e:000270 CFUNC :bind_call c:0047 p:0221 s:0265 e:000264 METHOD /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/context.rb:636 c:0046 p:0034 s:0251 e:000250 METHOD /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/context.rb:648 c:0045 p:0010 s:0239 e:000238 BLOCK /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/input-method.rb:277 c:0044 p:0024 s:0233 e:000232 METHOD /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/reline-0.6.2/lib/reline/line_editor.rb:787 <...snip...> -- Ruby level backtrace information ---------------------------------------- /Users/USER/.rbenv/versions/3.4.7/bin/irb:25:in '<main>' /Users/USER/.rbenv/versions/3.4.7/bin/irb:25:in 'load' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/exe/irb:9:in '<top (required)>' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:54:in 'start' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:173:in 'run' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:173:in 'catch' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:174:in 'block in run' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:193:in 'eval_input' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:278:in 'each_top_level_statement' <internal:kernel>:168:in 'loop' <...snip...> -- C level backtrace information ------------------------------------------- /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_bugreport+0xb6c) [0x102ccdaa8] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_bug_for_fatal_signal+0x100) [0x102b07bfc] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(sigsegv+0x84) [0x102c2e2f4] /usr/lib/system/libsystem_platform.dylib(_sigtramp+0x38) [0x19e60c624] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_callable_method_entry_with_refinements+0xd8) [0x102caabb4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_callable_method_entry_with_refinements+0xd8) [0x102caabb4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(obj_method+0x160) [0x102bcbf74] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call0_body+0x35c) [0x102cc4b50] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_call_kw+0xc4) [0x102cae300] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x46c8) [0x102ca77f0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x1b4) [0x102ca1fa4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_yield+0xa8) [0x102cafa54] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_ary_each+0x40) [0x102a5b7f8] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x1b4) [0x102ca1fa4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_yield+0xa8) [0x102cafa54] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_protect+0xb0) [0x102b13918] /Users/USER/.rbenv/versions/3.4.7/lib/ruby/3.4.0/arm64-darwin24/io/console.bundle(ttymode+0x1e0) [0x102462ab4] /Users/USER/.rbenv/versions/3.4.7/lib/ruby/3.4.0/arm64-darwin24/io/console.bundle(ttymode) (null):0 /Users/USER/.rbenv/versions/3.4.7/lib/ruby/3.4.0/arm64-darwin24/io/console.bundle(console_raw+0x40) [0x102460ca0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x134) [0x102ca1f24] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_yield+0xa8) [0x102cafa54] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_ensure+0xac) [0x102b13a70] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x134) [0x102ca1f24] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(catch_i+0x6c) [0x102cc6d50] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_catch_protect+0xbc) [0x102cb1b70] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_f_catch+0x70) [0x102cb2560] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x1b4) [0x102ca1fa4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(load_iseq_eval+0x224) [0x102b73b50] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_load_internal+0x84) [0x102b70e8c] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_f_load+0x8c) [0x102b72aa0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x46c8) [0x102ca77f0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x134) [0x102ca1f24] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_ec_exec_node+0x8c) [0x102b12c14] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(ruby_run_node+0x40) [0x102b12b3c] /Users/USER/.rbenv/versions/3.4.7/bin/ruby(main+0x68) [0x1022c0618] ``` ---Files-------------------------------- backtrace_ruby-3.4.7_macos.txt (111 KB) macos_crash_report_ruby-3.4.7.ips.txt (31.4 KB) backtrace_ruby-3.4.7_omarchy(archlinux).txt (90.4 KB) -- https://bugs.ruby-lang.org/
Issue #21673 has been updated by tompng (tomoya ishida). It can be reproduced without IRB ~~~ruby module Foo refine Kernel do def puts; end end end method(:puts) ~~~ ---------------------------------------- Bug #21673: Segmentation Fault in IRB when refining `Kernel#puts` using `Module#refine` (Regression since Ruby 3.4) https://bugs.ruby-lang.org/issues/21673#change-115122 * Author: yokomaru (Yoko Suzuki) * Status: Open * ruby -v: ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- In the IRB environment running Ruby 3.4 and later, the VM crashes with a Segmentation Fault when a module refining `Kernel#puts` is defined and `puts` is subsequently executed. The crash does not occur when the exact same code is executed as a regular Ruby script. **Environment** Reproduced on multiple environments: ``` macOS 15.5 (Apple Silicon M1, MacBook Pro) - ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24] - ruby 3.5.0dev (2025-11-06 master cf4a034d59) +PRISM [arm64-darwin24] - irb 1.15.3 (also reproduced with 1.13.1) - Installed via rbenv ``` ``` Omarhy 3.1.3(Linux 6.17.5-arch1-1) - ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [x86_64-linux] - irb 1.15.3 - Installed via mise ``` This does not occur on: Ruby 3.3.10 + IRB 1.13.1 **Steps to Reproduce (Reproduction Script)** The crash reproduces with these steps (on Ruby 3.4+): 1. Start irb. ```bash $ irb ``` 2. Define the refinement module for `Kernel#puts`. ```ruby module Foo refine Kernel do def puts end end end # Explicit 'using Foo' is NOT required ``` 3. Execute `puts` at the IRB prompt. ```ruby puts # ← Segmentation Fault occurs here ``` **Expected Result** As observed in Ruby 3.3.10, the IRB session should continue to operate normally. **Actual Result (Execution Log Excerpt)** The full crash logs (for macOS and Arch Linux) and the macOS crash report are provided in the attached files. ``` $ irb irb(main):001* module Foo irb(main):002* refine Kernel do irb(main):003* def puts irb(main):004* end irb(main):005* end irb(main):006> end => #<refinement:Kernel@Foo> irb(main):007> put/Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/context.rb:636: [BUG] Segmentation fault at 0x0000000000000030 ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24] puts -- Crash Report log information -------------------------------------------- See Crash Report log file in one of the following locations: * ~/Library/Logs/DiagnosticReports * /Library/Logs/DiagnosticReports for more details. Don't forget to include the above Crash Report log file in bug reports. -- Control frame information ----------------------------------------------- c:0049 p:---- s:0274 e:000273 CFUNC :public_method c:0048 p:---- s:0271 e:000270 CFUNC :bind_call c:0047 p:0221 s:0265 e:000264 METHOD /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/context.rb:636 c:0046 p:0034 s:0251 e:000250 METHOD /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/context.rb:648 c:0045 p:0010 s:0239 e:000238 BLOCK /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/input-method.rb:277 c:0044 p:0024 s:0233 e:000232 METHOD /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/reline-0.6.2/lib/reline/line_editor.rb:787 <...snip...> -- Ruby level backtrace information ---------------------------------------- /Users/USER/.rbenv/versions/3.4.7/bin/irb:25:in '<main>' /Users/USER/.rbenv/versions/3.4.7/bin/irb:25:in 'load' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/exe/irb:9:in '<top (required)>' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:54:in 'start' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:173:in 'run' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:173:in 'catch' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:174:in 'block in run' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:193:in 'eval_input' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:278:in 'each_top_level_statement' <internal:kernel>:168:in 'loop' <...snip...> -- C level backtrace information ------------------------------------------- /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_bugreport+0xb6c) [0x102ccdaa8] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_bug_for_fatal_signal+0x100) [0x102b07bfc] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(sigsegv+0x84) [0x102c2e2f4] /usr/lib/system/libsystem_platform.dylib(_sigtramp+0x38) [0x19e60c624] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_callable_method_entry_with_refinements+0xd8) [0x102caabb4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_callable_method_entry_with_refinements+0xd8) [0x102caabb4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(obj_method+0x160) [0x102bcbf74] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call0_body+0x35c) [0x102cc4b50] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_call_kw+0xc4) [0x102cae300] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x46c8) [0x102ca77f0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x1b4) [0x102ca1fa4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_yield+0xa8) [0x102cafa54] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_ary_each+0x40) [0x102a5b7f8] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x1b4) [0x102ca1fa4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_yield+0xa8) [0x102cafa54] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_protect+0xb0) [0x102b13918] /Users/USER/.rbenv/versions/3.4.7/lib/ruby/3.4.0/arm64-darwin24/io/console.bundle(ttymode+0x1e0) [0x102462ab4] /Users/USER/.rbenv/versions/3.4.7/lib/ruby/3.4.0/arm64-darwin24/io/console.bundle(ttymode) (null):0 /Users/USER/.rbenv/versions/3.4.7/lib/ruby/3.4.0/arm64-darwin24/io/console.bundle(console_raw+0x40) [0x102460ca0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x134) [0x102ca1f24] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_yield+0xa8) [0x102cafa54] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_ensure+0xac) [0x102b13a70] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x134) [0x102ca1f24] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(catch_i+0x6c) [0x102cc6d50] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_catch_protect+0xbc) [0x102cb1b70] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_f_catch+0x70) [0x102cb2560] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x1b4) [0x102ca1fa4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(load_iseq_eval+0x224) [0x102b73b50] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_load_internal+0x84) [0x102b70e8c] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_f_load+0x8c) [0x102b72aa0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x46c8) [0x102ca77f0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x134) [0x102ca1f24] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_ec_exec_node+0x8c) [0x102b12c14] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(ruby_run_node+0x40) [0x102b12b3c] /Users/USER/.rbenv/versions/3.4.7/bin/ruby(main+0x68) [0x1022c0618] ``` ---Files-------------------------------- backtrace_ruby-3.4.7_macos.txt (111 KB) macos_crash_report_ruby-3.4.7.ips.txt (31.4 KB) backtrace_ruby-3.4.7_omarchy(archlinux).txt (90.4 KB) -- https://bugs.ruby-lang.org/
Issue #21673 has been updated by nobu (Nobuyoshi Nakada). Although I'm not sure why 3.3 didn't crash, probably, since ME owned by a module doesn't have `defined_class`, it shouldn't be copied to `defined_class_ptr`? ```diff diff --git a/vm_method.c b/vm_method.c index 506a2919b77..8b2983e621e 100644 --- a/vm_method.c +++ b/vm_method.c @@ -2005,7 +2005,16 @@ resolve_refined_method(VALUE refinements, const rb_method_entry_t *me, VALUE *de tmp_me = me->def->body.refined.orig_me; if (tmp_me) { - if (defined_class_ptr) *defined_class_ptr = tmp_me->defined_class; + if (!tmp_me->defined_class) { + VM_ASSERT_TYPE(tmp_me->owner, T_MODULE); + if (defined_class_ptr) { + VM_ASSERT_TYPE(*defined_class_ptr, T_ICLASS); + VM_ASSERT(RBASIC_CLASS(*defined_class_ptr) == tmp_me->owner); + } + } + else if (defined_class_ptr) { + *defined_class_ptr = tmp_me->defined_class; + } return tmp_me; } ``` ---------------------------------------- Bug #21673: Segmentation Fault in IRB when refining `Kernel#puts` using `Module#refine` (Regression since Ruby 3.4) https://bugs.ruby-lang.org/issues/21673#change-115128 * Author: yokomaru (Yoko Suzuki) * Status: Open * ruby -v: ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- In the IRB environment running Ruby 3.4 and later, the VM crashes with a Segmentation Fault when a module refining `Kernel#puts` is defined and `puts` is subsequently executed. The crash does not occur when the exact same code is executed as a regular Ruby script. **Environment** Reproduced on multiple environments: ``` macOS 15.5 (Apple Silicon M1, MacBook Pro) - ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24] - ruby 3.5.0dev (2025-11-06 master cf4a034d59) +PRISM [arm64-darwin24] - irb 1.15.3 (also reproduced with 1.13.1) - Installed via rbenv ``` ``` Omarhy 3.1.3(Linux 6.17.5-arch1-1) - ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [x86_64-linux] - irb 1.15.3 - Installed via mise ``` This does not occur on: Ruby 3.3.10 + IRB 1.13.1 **Steps to Reproduce (Reproduction Script)** The crash reproduces with these steps (on Ruby 3.4+): 1. Start irb. ```bash $ irb ``` 2. Define the refinement module for `Kernel#puts`. ```ruby module Foo refine Kernel do def puts end end end # Explicit 'using Foo' is NOT required ``` 3. Execute `puts` at the IRB prompt. ```ruby puts # ← Segmentation Fault occurs here ``` **Expected Result** As observed in Ruby 3.3.10, the IRB session should continue to operate normally. **Actual Result (Execution Log Excerpt)** The full crash logs (for macOS and Arch Linux) and the macOS crash report are provided in the attached files. ``` $ irb irb(main):001* module Foo irb(main):002* refine Kernel do irb(main):003* def puts irb(main):004* end irb(main):005* end irb(main):006> end => #<refinement:Kernel@Foo> irb(main):007> put/Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/context.rb:636: [BUG] Segmentation fault at 0x0000000000000030 ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24] puts -- Crash Report log information -------------------------------------------- See Crash Report log file in one of the following locations: * ~/Library/Logs/DiagnosticReports * /Library/Logs/DiagnosticReports for more details. Don't forget to include the above Crash Report log file in bug reports. -- Control frame information ----------------------------------------------- c:0049 p:---- s:0274 e:000273 CFUNC :public_method c:0048 p:---- s:0271 e:000270 CFUNC :bind_call c:0047 p:0221 s:0265 e:000264 METHOD /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/context.rb:636 c:0046 p:0034 s:0251 e:000250 METHOD /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/context.rb:648 c:0045 p:0010 s:0239 e:000238 BLOCK /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/input-method.rb:277 c:0044 p:0024 s:0233 e:000232 METHOD /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/reline-0.6.2/lib/reline/line_editor.rb:787 <...snip...> -- Ruby level backtrace information ---------------------------------------- /Users/USER/.rbenv/versions/3.4.7/bin/irb:25:in '<main>' /Users/USER/.rbenv/versions/3.4.7/bin/irb:25:in 'load' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/exe/irb:9:in '<top (required)>' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:54:in 'start' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:173:in 'run' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:173:in 'catch' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:174:in 'block in run' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:193:in 'eval_input' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:278:in 'each_top_level_statement' <internal:kernel>:168:in 'loop' <...snip...> -- C level backtrace information ------------------------------------------- /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_bugreport+0xb6c) [0x102ccdaa8] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_bug_for_fatal_signal+0x100) [0x102b07bfc] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(sigsegv+0x84) [0x102c2e2f4] /usr/lib/system/libsystem_platform.dylib(_sigtramp+0x38) [0x19e60c624] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_callable_method_entry_with_refinements+0xd8) [0x102caabb4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_callable_method_entry_with_refinements+0xd8) [0x102caabb4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(obj_method+0x160) [0x102bcbf74] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call0_body+0x35c) [0x102cc4b50] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_call_kw+0xc4) [0x102cae300] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x46c8) [0x102ca77f0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x1b4) [0x102ca1fa4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_yield+0xa8) [0x102cafa54] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_ary_each+0x40) [0x102a5b7f8] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x1b4) [0x102ca1fa4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_yield+0xa8) [0x102cafa54] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_protect+0xb0) [0x102b13918] /Users/USER/.rbenv/versions/3.4.7/lib/ruby/3.4.0/arm64-darwin24/io/console.bundle(ttymode+0x1e0) [0x102462ab4] /Users/USER/.rbenv/versions/3.4.7/lib/ruby/3.4.0/arm64-darwin24/io/console.bundle(ttymode) (null):0 /Users/USER/.rbenv/versions/3.4.7/lib/ruby/3.4.0/arm64-darwin24/io/console.bundle(console_raw+0x40) [0x102460ca0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x134) [0x102ca1f24] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_yield+0xa8) [0x102cafa54] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_ensure+0xac) [0x102b13a70] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x134) [0x102ca1f24] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(catch_i+0x6c) [0x102cc6d50] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_catch_protect+0xbc) [0x102cb1b70] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_f_catch+0x70) [0x102cb2560] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x1b4) [0x102ca1fa4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(load_iseq_eval+0x224) [0x102b73b50] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_load_internal+0x84) [0x102b70e8c] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_f_load+0x8c) [0x102b72aa0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x46c8) [0x102ca77f0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x134) [0x102ca1f24] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_ec_exec_node+0x8c) [0x102b12c14] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(ruby_run_node+0x40) [0x102b12b3c] /Users/USER/.rbenv/versions/3.4.7/bin/ruby(main+0x68) [0x1022c0618] ``` ---Files-------------------------------- backtrace_ruby-3.4.7_macos.txt (111 KB) macos_crash_report_ruby-3.4.7.ips.txt (31.4 KB) backtrace_ruby-3.4.7_omarchy(archlinux).txt (90.4 KB) -- https://bugs.ruby-lang.org/
Issue #21673 has been updated by nagachika (Tomoyuki Chikanaga). Backport changed from 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN to 3.2: REQUIRED, 3.3: REQUIRED, 3.4: REQUIRED I wasn't able to reproduce the SEGV using the added test code. However, the implemfentation of resolve_refined_method() is the same on every stable branch. I will fill the Backport field with `REQUIRED`. ---------------------------------------- Bug #21673: Segmentation Fault in IRB when refining `Kernel#puts` using `Module#refine` (Regression since Ruby 3.4) https://bugs.ruby-lang.org/issues/21673#change-115137 * Author: yokomaru (Yoko Suzuki) * Status: Closed * ruby -v: ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24] * Backport: 3.2: REQUIRED, 3.3: REQUIRED, 3.4: REQUIRED ---------------------------------------- In the IRB environment running Ruby 3.4 and later, the VM crashes with a Segmentation Fault when a module refining `Kernel#puts` is defined and `puts` is subsequently executed. The crash does not occur when the exact same code is executed as a regular Ruby script. **Environment** Reproduced on multiple environments: ``` macOS 15.5 (Apple Silicon M1, MacBook Pro) - ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24] - ruby 3.5.0dev (2025-11-06 master cf4a034d59) +PRISM [arm64-darwin24] - irb 1.15.3 (also reproduced with 1.13.1) - Installed via rbenv ``` ``` Omarhy 3.1.3(Linux 6.17.5-arch1-1) - ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [x86_64-linux] - irb 1.15.3 - Installed via mise ``` This does not occur on: Ruby 3.3.10 + IRB 1.13.1 **Steps to Reproduce (Reproduction Script)** The crash reproduces with these steps (on Ruby 3.4+): 1. Start irb. ```bash $ irb ``` 2. Define the refinement module for `Kernel#puts`. ```ruby module Foo refine Kernel do def puts end end end # Explicit 'using Foo' is NOT required ``` 3. Execute `puts` at the IRB prompt. ```ruby puts # ← Segmentation Fault occurs here ``` **Expected Result** As observed in Ruby 3.3.10, the IRB session should continue to operate normally. **Actual Result (Execution Log Excerpt)** The full crash logs (for macOS and Arch Linux) and the macOS crash report are provided in the attached files. ``` $ irb irb(main):001* module Foo irb(main):002* refine Kernel do irb(main):003* def puts irb(main):004* end irb(main):005* end irb(main):006> end => #<refinement:Kernel@Foo> irb(main):007> put/Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/context.rb:636: [BUG] Segmentation fault at 0x0000000000000030 ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24] puts -- Crash Report log information -------------------------------------------- See Crash Report log file in one of the following locations: * ~/Library/Logs/DiagnosticReports * /Library/Logs/DiagnosticReports for more details. Don't forget to include the above Crash Report log file in bug reports. -- Control frame information ----------------------------------------------- c:0049 p:---- s:0274 e:000273 CFUNC :public_method c:0048 p:---- s:0271 e:000270 CFUNC :bind_call c:0047 p:0221 s:0265 e:000264 METHOD /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/context.rb:636 c:0046 p:0034 s:0251 e:000250 METHOD /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/context.rb:648 c:0045 p:0010 s:0239 e:000238 BLOCK /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/input-method.rb:277 c:0044 p:0024 s:0233 e:000232 METHOD /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/reline-0.6.2/lib/reline/line_editor.rb:787 <...snip...> -- Ruby level backtrace information ---------------------------------------- /Users/USER/.rbenv/versions/3.4.7/bin/irb:25:in '<main>' /Users/USER/.rbenv/versions/3.4.7/bin/irb:25:in 'load' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/exe/irb:9:in '<top (required)>' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:54:in 'start' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:173:in 'run' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:173:in 'catch' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:174:in 'block in run' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:193:in 'eval_input' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:278:in 'each_top_level_statement' <internal:kernel>:168:in 'loop' <...snip...> -- C level backtrace information ------------------------------------------- /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_bugreport+0xb6c) [0x102ccdaa8] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_bug_for_fatal_signal+0x100) [0x102b07bfc] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(sigsegv+0x84) [0x102c2e2f4] /usr/lib/system/libsystem_platform.dylib(_sigtramp+0x38) [0x19e60c624] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_callable_method_entry_with_refinements+0xd8) [0x102caabb4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_callable_method_entry_with_refinements+0xd8) [0x102caabb4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(obj_method+0x160) [0x102bcbf74] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call0_body+0x35c) [0x102cc4b50] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_call_kw+0xc4) [0x102cae300] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x46c8) [0x102ca77f0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x1b4) [0x102ca1fa4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_yield+0xa8) [0x102cafa54] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_ary_each+0x40) [0x102a5b7f8] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x1b4) [0x102ca1fa4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_yield+0xa8) [0x102cafa54] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_protect+0xb0) [0x102b13918] /Users/USER/.rbenv/versions/3.4.7/lib/ruby/3.4.0/arm64-darwin24/io/console.bundle(ttymode+0x1e0) [0x102462ab4] /Users/USER/.rbenv/versions/3.4.7/lib/ruby/3.4.0/arm64-darwin24/io/console.bundle(ttymode) (null):0 /Users/USER/.rbenv/versions/3.4.7/lib/ruby/3.4.0/arm64-darwin24/io/console.bundle(console_raw+0x40) [0x102460ca0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x134) [0x102ca1f24] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_yield+0xa8) [0x102cafa54] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_ensure+0xac) [0x102b13a70] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x134) [0x102ca1f24] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(catch_i+0x6c) [0x102cc6d50] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_catch_protect+0xbc) [0x102cb1b70] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_f_catch+0x70) [0x102cb2560] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x1b4) [0x102ca1fa4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(load_iseq_eval+0x224) [0x102b73b50] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_load_internal+0x84) [0x102b70e8c] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_f_load+0x8c) [0x102b72aa0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x46c8) [0x102ca77f0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x134) [0x102ca1f24] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_ec_exec_node+0x8c) [0x102b12c14] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(ruby_run_node+0x40) [0x102b12b3c] /Users/USER/.rbenv/versions/3.4.7/bin/ruby(main+0x68) [0x1022c0618] ``` ---Files-------------------------------- backtrace_ruby-3.4.7_macos.txt (111 KB) macos_crash_report_ruby-3.4.7.ips.txt (31.4 KB) backtrace_ruby-3.4.7_omarchy(archlinux).txt (90.4 KB) -- https://bugs.ruby-lang.org/
Issue #21673 has been updated by nagachika (Tomoyuki Chikanaga). Backport changed from 3.2: REQUIRED, 3.3: REQUIRED, 3.4: REQUIRED to 3.2: REQUIRED, 3.3: DONE, 3.4: REQUIRED ruby_3_3 commit:62135b9da4872b370d6fb579fc4a415e8f641c7d merged revision(s) commit:a4dff09be79b52288a47658964d25e5aa84fc960. ---------------------------------------- Bug #21673: Segmentation Fault in IRB when refining `Kernel#puts` using `Module#refine` (Regression since Ruby 3.4) https://bugs.ruby-lang.org/issues/21673#change-115352 * Author: yokomaru (Yoko Suzuki) * Status: Closed * ruby -v: ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24] * Backport: 3.2: REQUIRED, 3.3: DONE, 3.4: REQUIRED ---------------------------------------- In the IRB environment running Ruby 3.4 and later, the VM crashes with a Segmentation Fault when a module refining `Kernel#puts` is defined and `puts` is subsequently executed. The crash does not occur when the exact same code is executed as a regular Ruby script. **Environment** Reproduced on multiple environments: ``` macOS 15.5 (Apple Silicon M1, MacBook Pro) - ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24] - ruby 3.5.0dev (2025-11-06 master cf4a034d59) +PRISM [arm64-darwin24] - irb 1.15.3 (also reproduced with 1.13.1) - Installed via rbenv ``` ``` Omarhy 3.1.3(Linux 6.17.5-arch1-1) - ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [x86_64-linux] - irb 1.15.3 - Installed via mise ``` This does not occur on: Ruby 3.3.10 + IRB 1.13.1 **Steps to Reproduce (Reproduction Script)** The crash reproduces with these steps (on Ruby 3.4+): 1. Start irb. ```bash $ irb ``` 2. Define the refinement module for `Kernel#puts`. ```ruby module Foo refine Kernel do def puts end end end # Explicit 'using Foo' is NOT required ``` 3. Execute `puts` at the IRB prompt. ```ruby puts # ← Segmentation Fault occurs here ``` **Expected Result** As observed in Ruby 3.3.10, the IRB session should continue to operate normally. **Actual Result (Execution Log Excerpt)** The full crash logs (for macOS and Arch Linux) and the macOS crash report are provided in the attached files. ``` $ irb irb(main):001* module Foo irb(main):002* refine Kernel do irb(main):003* def puts irb(main):004* end irb(main):005* end irb(main):006> end => #<refinement:Kernel@Foo> irb(main):007> put/Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/context.rb:636: [BUG] Segmentation fault at 0x0000000000000030 ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24] puts -- Crash Report log information -------------------------------------------- See Crash Report log file in one of the following locations: * ~/Library/Logs/DiagnosticReports * /Library/Logs/DiagnosticReports for more details. Don't forget to include the above Crash Report log file in bug reports. -- Control frame information ----------------------------------------------- c:0049 p:---- s:0274 e:000273 CFUNC :public_method c:0048 p:---- s:0271 e:000270 CFUNC :bind_call c:0047 p:0221 s:0265 e:000264 METHOD /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/context.rb:636 c:0046 p:0034 s:0251 e:000250 METHOD /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/context.rb:648 c:0045 p:0010 s:0239 e:000238 BLOCK /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/input-method.rb:277 c:0044 p:0024 s:0233 e:000232 METHOD /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/reline-0.6.2/lib/reline/line_editor.rb:787 <...snip...> -- Ruby level backtrace information ---------------------------------------- /Users/USER/.rbenv/versions/3.4.7/bin/irb:25:in '<main>' /Users/USER/.rbenv/versions/3.4.7/bin/irb:25:in 'load' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/exe/irb:9:in '<top (required)>' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:54:in 'start' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:173:in 'run' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:173:in 'catch' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:174:in 'block in run' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:193:in 'eval_input' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:278:in 'each_top_level_statement' <internal:kernel>:168:in 'loop' <...snip...> -- C level backtrace information ------------------------------------------- /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_bugreport+0xb6c) [0x102ccdaa8] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_bug_for_fatal_signal+0x100) [0x102b07bfc] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(sigsegv+0x84) [0x102c2e2f4] /usr/lib/system/libsystem_platform.dylib(_sigtramp+0x38) [0x19e60c624] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_callable_method_entry_with_refinements+0xd8) [0x102caabb4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_callable_method_entry_with_refinements+0xd8) [0x102caabb4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(obj_method+0x160) [0x102bcbf74] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call0_body+0x35c) [0x102cc4b50] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_call_kw+0xc4) [0x102cae300] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x46c8) [0x102ca77f0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x1b4) [0x102ca1fa4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_yield+0xa8) [0x102cafa54] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_ary_each+0x40) [0x102a5b7f8] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x1b4) [0x102ca1fa4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_yield+0xa8) [0x102cafa54] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_protect+0xb0) [0x102b13918] /Users/USER/.rbenv/versions/3.4.7/lib/ruby/3.4.0/arm64-darwin24/io/console.bundle(ttymode+0x1e0) [0x102462ab4] /Users/USER/.rbenv/versions/3.4.7/lib/ruby/3.4.0/arm64-darwin24/io/console.bundle(ttymode) (null):0 /Users/USER/.rbenv/versions/3.4.7/lib/ruby/3.4.0/arm64-darwin24/io/console.bundle(console_raw+0x40) [0x102460ca0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x134) [0x102ca1f24] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_yield+0xa8) [0x102cafa54] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_ensure+0xac) [0x102b13a70] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x134) [0x102ca1f24] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(catch_i+0x6c) [0x102cc6d50] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_catch_protect+0xbc) [0x102cb1b70] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_f_catch+0x70) [0x102cb2560] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x1b4) [0x102ca1fa4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(load_iseq_eval+0x224) [0x102b73b50] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_load_internal+0x84) [0x102b70e8c] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_f_load+0x8c) [0x102b72aa0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x46c8) [0x102ca77f0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x134) [0x102ca1f24] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_ec_exec_node+0x8c) [0x102b12c14] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(ruby_run_node+0x40) [0x102b12b3c] /Users/USER/.rbenv/versions/3.4.7/bin/ruby(main+0x68) [0x1022c0618] ``` ---Files-------------------------------- backtrace_ruby-3.4.7_macos.txt (111 KB) macos_crash_report_ruby-3.4.7.ips.txt (31.4 KB) backtrace_ruby-3.4.7_omarchy(archlinux).txt (90.4 KB) -- https://bugs.ruby-lang.org/
Issue #21673 has been updated by k0kubun (Takashi Kokubun). Backport changed from 3.2: REQUIRED, 3.3: DONE, 3.4: REQUIRED to 3.2: REQUIRED, 3.3: DONE, 3.4: DONE ruby_3_4 commit:625eeae0db2749e62152d8a750706eff24a271d0 merged revision(s) commit:a4dff09be79b52288a47658964d25e5aa84fc960. ---------------------------------------- Bug #21673: Segmentation Fault in IRB when refining `Kernel#puts` using `Module#refine` (Regression since Ruby 3.4) https://bugs.ruby-lang.org/issues/21673#change-115500 * Author: yokomaru (Yoko Suzuki) * Status: Closed * ruby -v: ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24] * Backport: 3.2: REQUIRED, 3.3: DONE, 3.4: DONE ---------------------------------------- In the IRB environment running Ruby 3.4 and later, the VM crashes with a Segmentation Fault when a module refining `Kernel#puts` is defined and `puts` is subsequently executed. The crash does not occur when the exact same code is executed as a regular Ruby script. **Environment** Reproduced on multiple environments: ``` macOS 15.5 (Apple Silicon M1, MacBook Pro) - ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24] - ruby 3.5.0dev (2025-11-06 master cf4a034d59) +PRISM [arm64-darwin24] - irb 1.15.3 (also reproduced with 1.13.1) - Installed via rbenv ``` ``` Omarhy 3.1.3(Linux 6.17.5-arch1-1) - ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [x86_64-linux] - irb 1.15.3 - Installed via mise ``` This does not occur on: Ruby 3.3.10 + IRB 1.13.1 **Steps to Reproduce (Reproduction Script)** The crash reproduces with these steps (on Ruby 3.4+): 1. Start irb. ```bash $ irb ``` 2. Define the refinement module for `Kernel#puts`. ```ruby module Foo refine Kernel do def puts end end end # Explicit 'using Foo' is NOT required ``` 3. Execute `puts` at the IRB prompt. ```ruby puts # ← Segmentation Fault occurs here ``` **Expected Result** As observed in Ruby 3.3.10, the IRB session should continue to operate normally. **Actual Result (Execution Log Excerpt)** The full crash logs (for macOS and Arch Linux) and the macOS crash report are provided in the attached files. ``` $ irb irb(main):001* module Foo irb(main):002* refine Kernel do irb(main):003* def puts irb(main):004* end irb(main):005* end irb(main):006> end => #<refinement:Kernel@Foo> irb(main):007> put/Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/context.rb:636: [BUG] Segmentation fault at 0x0000000000000030 ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24] puts -- Crash Report log information -------------------------------------------- See Crash Report log file in one of the following locations: * ~/Library/Logs/DiagnosticReports * /Library/Logs/DiagnosticReports for more details. Don't forget to include the above Crash Report log file in bug reports. -- Control frame information ----------------------------------------------- c:0049 p:---- s:0274 e:000273 CFUNC :public_method c:0048 p:---- s:0271 e:000270 CFUNC :bind_call c:0047 p:0221 s:0265 e:000264 METHOD /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/context.rb:636 c:0046 p:0034 s:0251 e:000250 METHOD /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/context.rb:648 c:0045 p:0010 s:0239 e:000238 BLOCK /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb/input-method.rb:277 c:0044 p:0024 s:0233 e:000232 METHOD /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/reline-0.6.2/lib/reline/line_editor.rb:787 <...snip...> -- Ruby level backtrace information ---------------------------------------- /Users/USER/.rbenv/versions/3.4.7/bin/irb:25:in '<main>' /Users/USER/.rbenv/versions/3.4.7/bin/irb:25:in 'load' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/exe/irb:9:in '<top (required)>' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:54:in 'start' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:173:in 'run' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:173:in 'catch' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:174:in 'block in run' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:193:in 'eval_input' /Users/USER/.rbenv/versions/3.4.7/lib/ruby/gems/3.4.0/gems/irb-1.15.3/lib/irb.rb:278:in 'each_top_level_statement' <internal:kernel>:168:in 'loop' <...snip...> -- C level backtrace information ------------------------------------------- /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_bugreport+0xb6c) [0x102ccdaa8] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_bug_for_fatal_signal+0x100) [0x102b07bfc] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(sigsegv+0x84) [0x102c2e2f4] /usr/lib/system/libsystem_platform.dylib(_sigtramp+0x38) [0x19e60c624] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_callable_method_entry_with_refinements+0xd8) [0x102caabb4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_callable_method_entry_with_refinements+0xd8) [0x102caabb4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(obj_method+0x160) [0x102bcbf74] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call0_body+0x35c) [0x102cc4b50] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_call_kw+0xc4) [0x102cae300] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x46c8) [0x102ca77f0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x1b4) [0x102ca1fa4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_yield+0xa8) [0x102cafa54] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_ary_each+0x40) [0x102a5b7f8] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x1b4) [0x102ca1fa4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_yield+0xa8) [0x102cafa54] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_protect+0xb0) [0x102b13918] /Users/USER/.rbenv/versions/3.4.7/lib/ruby/3.4.0/arm64-darwin24/io/console.bundle(ttymode+0x1e0) [0x102462ab4] /Users/USER/.rbenv/versions/3.4.7/lib/ruby/3.4.0/arm64-darwin24/io/console.bundle(ttymode) (null):0 /Users/USER/.rbenv/versions/3.4.7/lib/ruby/3.4.0/arm64-darwin24/io/console.bundle(console_raw+0x40) [0x102460ca0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x134) [0x102ca1f24] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_yield+0xa8) [0x102cafa54] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_ensure+0xac) [0x102b13a70] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x134) [0x102ca1f24] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(invoke_block_from_c_bh+0x36c) [0x102cc7614] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(catch_i+0x6c) [0x102cc6d50] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_catch_protect+0xbc) [0x102cb1b70] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_f_catch+0x70) [0x102cb2560] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x2620) [0x102ca5748] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x1b4) [0x102ca1fa4] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(load_iseq_eval+0x224) [0x102b73b50] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_load_internal+0x84) [0x102b70e8c] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_f_load+0x8c) [0x102b72aa0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_call_cfunc_with_frame_+0xf0) [0x102cbf798] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(vm_exec_core+0x46c8) [0x102ca77f0] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_vm_exec+0x134) [0x102ca1f24] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(rb_ec_exec_node+0x8c) [0x102b12c14] /Users/USER/.rbenv/versions/3.4.7/lib/libruby.3.4.dylib(ruby_run_node+0x40) [0x102b12b3c] /Users/USER/.rbenv/versions/3.4.7/bin/ruby(main+0x68) [0x1022c0618] ``` ---Files-------------------------------- backtrace_ruby-3.4.7_macos.txt (111 KB) macos_crash_report_ruby-3.4.7.ips.txt (31.4 KB) backtrace_ruby-3.4.7_omarchy(archlinux).txt (90.4 KB) -- https://bugs.ruby-lang.org/
participants (5)
-
k0kubun (Takashi Kokubun) -
nagachika (Tomoyuki Chikanaga)
-
nobu (Nobuyoshi Nakada)
-
tompng (tomoya ishida)
-
yokomaru (Yoko Suzuki)