Issue #19994 has been updated by kjtsanaktsidis (KJ Tsanaktsidis). I think I understand-ish the issue now and it looks like https://github.com/ruby/ruby/pull/8899 fixes it (on my machine). @mtasaka would you be able to tell me if this fixes the issue for you? And @ko1 would you be able to look at my PR? I'm not very confident with the whole method resolution & caching machinery. ---------------------------------------- Bug #19994: Seemingly require causes segfault?? https://bugs.ruby-lang.org/issues/19994#change-105267 * Author: mtasaka (Mamoru Tasaka) * Status: Open * Priority: Normal * ruby -v: ruby 3.3.0dev (2023-11-08 master c8d4b103a9) [x86_64-linux] * Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- With commit:c8d4b103a9 , trying to execute stringex-2.8.6 https://github.com/rsl/stringex/releases/tag/v2.8.6 testsuite seems to cause ruby segfault. Trying to minimize code, the following causes segfault for almost all time (about 90%): ``` require 'test/unit' require 'active_record' ActiveRecord::Base.establish_connection adapter: "sqlite3", database: ":memory:" ``` (strangely, with commenting out the first line i.e. `require 'test/unit'` segfault no longer ocuurs...) Backtrace: ``` Thread 1 "ruby-mri" received signal SIGSEGV, Segmentation fault. vm_call_cfunc_with_frame_ (ec=0x55555555d1c0, reg_cfp=0x7ffff7670b78, calling=<optimized out>, argc=<optimized out>, argv=<optimized out>, stack_bottom=<optimized out>) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm_insnhelper.c:3499 3499 int len = cfunc->argc; Missing separate debuginfos, use: dnf debuginfo-install glibc-2.38.9000-17.fc40.x86_64 gmp-6.2.1-5.fc39.x86_64 libgcc-13.2.1-4.fc40.x86_64 libxcrypt-4.4.36-2.fc39.x86_64 libyaml-0.2.5-12.fc39.x86_64 openssl-libs-3.1.4-1.fc40.x86_64 rubygem-json-2.6.3-204.fc40.140.x86_64 rubygem-sqlite3-1.6.1-2.fc40.140.x86_64 sqlite-libs-3.44.0-1.fc40.x86_64 zlib-1.2.13-5.fc40.x86_64 (gdb) bt #0 vm_call_cfunc_with_frame_ (ec=0x55555555d1c0, reg_cfp=0x7ffff7670b78, calling=<optimized out>, argc=<optimized out>, argv=<optimized out>, stack_bottom=<optimized out>) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm_insnhelper.c:3499 #1 0x00007ffff7c5b62c in vm_sendish (method_explorer=<optimized out>, block_handler=<optimized out>, cd=<optimized out>, reg_cfp=<optimized out>, ec=<optimized out>) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm_insnhelper.c:5581 #2 vm_exec_core (ec=0x55555555d1c0) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/redhat-linux-build/insns.def:822 #3 0x00007ffff7c739dd in rb_vm_exec (ec=0x55555555d1c0) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm.c:2472 #4 0x00007ffff7c61463 in vm_yield_with_cref (is_lambda=0, cref=0x0, kw_splat=0, argv=0x0, argc=0, ec=<optimized out>) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm.c:1622 #5 vm_yield (kw_splat=0, argv=0x0, argc=0, ec=<optimized out>) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm.c:1630 #6 rb_yield_0 (argv=0x0, argc=0) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm_eval.c:1362 #7 rb_yield_values2 (argc=0, argv=0x0) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm_eval.c:1408 #8 0x00007ffff7ad3b4f in rb_ensure (b_proc=0x7fffde0fb990 <monitor_sync_body>, data1=140736888155080, e_proc=0x7fffde0fb6e0 <monitor_sync_ensure>, data2=<optimized out>) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/eval.c:1009 #9 0x00007ffff7c540c7 in vm_call_cfunc_with_frame_ (ec=0x55555555d1c0, reg_cfp=0x7ffff7670c20, calling=<optimized out>, argc=<optimized out>, argv=<optimized out>, stack_bottom=<optimized out>) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm_insnhelper.c:3503 #10 0x00007ffff7c56641 in vm_sendish (ec=0x55555555d1c0, reg_cfp=0x7ffff7670c20, cd=<optimized out>, block_handler=<optimized out>, method_explorer=<optimized out>) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm_callinfo.h:407 #11 0x00007ffff7c5d43f in vm_exec_core (ec=0x55555555d1c0) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/redhat-linux-build/insns.def:802 #12 0x00007ffff7c739dd in rb_vm_exec (ec=0x55555555d1c0) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm.c:2472 #13 0x00007ffff7b358fb in require_internal (ec=ec@entry=0x55555555d1c0, fname=<optimized out>, fname@entry=140736887218320, exception=exception@entry=1, warn=false) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/load.c:1247 #14 0x00007ffff7b35e4e in rb_require_string_internal (fname=140736887218320) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/load.c:1346 #15 0x00007ffff7b35f08 in rb_require_string (fname=<optimized out>) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/load.c:1339 #16 0x00007ffff7c540c7 in vm_call_cfunc_with_frame_ (ec=0x55555555d1c0, reg_cfp=0x7ffff7670cc8, calling=<optimized out>, argc=<optimized out>, argv=<optimized out>, stack_bottom=<optimized out>) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm_insnhelper.c:3503 #17 0x00007ffff7c57b1f in vm_call_alias (ec=0x55555555d1c0, cfp=0x7ffff7670cc8, calling=0x7fffffffce00) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm_insnhelper.c:3873 #18 0x00007ffff7c5b62c in vm_sendish (method_explorer=<optimized out>, block_handler=<optimized out>, cd=<optimized out>, reg_cfp=<optimized out>, ec=<optimized out>) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm_insnhelper.c:5581 #19 vm_exec_core (ec=0x55555555d1c0) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/redhat-linux-build/insns.def:822 #20 0x00007ffff7c739dd in rb_vm_exec (ec=0x55555555d1c0) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm.c:2472 #21 0x00007ffff7b358fb in require_internal (ec=ec@entry=0x55555555d1c0, fname=<optimized out>, fname@entry=140736885373720, exception=exception@entry=1, warn=false) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/load.c:1247 #22 0x00007ffff7b35e4e in rb_require_string_internal (fname=140736885373720) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/load.c:1346 #23 0x00007ffff7b35f08 in rb_require_string (fname=<optimized out>) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/load.c:1339 #24 0x00007ffff7c540c7 in vm_call_cfunc_with_frame_ (ec=0x55555555d1c0, reg_cfp=0x7ffff7670d70, calling=<optimized out>, argc=<optimized out>, argv=<optimized out>, stack_bottom=<optimized out>) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm_insnhelper.c:3503 #25 0x00007ffff7c57b1f in vm_call_alias (ec=0x55555555d1c0, cfp=0x7ffff7670d70, calling=0x7fffffffd3f0) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm_insnhelper.c:3873 #26 0x00007ffff7c5b62c in vm_sendish (method_explorer=<optimized out>, block_handler=<optimized out>, cd=<optimized out>, reg_cfp=<optimized out>, ec=<optimized out>) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm_insnhelper.c:5581 #27 vm_exec_core (ec=0x55555555d1c0) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/redhat-linux-build/insns.def:822 #28 0x00007ffff7c73bfe in vm_exec_loop (result=<optimized out>, tag=0x7fffffffd480, state=<optimized out>, ec=0x55555555d1c0) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm.c:2499 #29 rb_vm_exec (ec=0x55555555d1c0) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm.c:2478 #30 0x00007ffff7b358fb in require_internal (ec=ec@entry=0x55555555d1c0, fname=<optimized out>, fname@entry=140736888126320, exception=exception@entry=1, warn=false) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/load.c:1247 #31 0x00007ffff7b35e4e in rb_require_string_internal (fname=140736888126320) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/load.c:1346 #32 0x00007ffff7b35f08 in rb_require_string (fname=<optimized out>) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/load.c:1339 #33 0x00007ffff7c540c7 in vm_call_cfunc_with_frame_ (ec=0x55555555d1c0, reg_cfp=0x7ffff7670e18, calling=<optimized out>, argc=<optimized out>, argv=<optimized out>, stack_bottom=<optimized out>) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm_insnhelper.c:3503 #34 0x00007ffff7c57b1f in vm_call_alias (ec=0x55555555d1c0, cfp=0x7ffff7670e18, calling=0x7fffffffd9e0) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm_insnhelper.c:3873 #35 0x00007ffff7c5b62c in vm_sendish (method_explorer=<optimized out>, block_handler=<optimized out>, cd=<optimized out>, reg_cfp=<optimized out>, ec=<optimized out>) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm_insnhelper.c:5581 --Type <RET> for more, q to quit, c to continue without paging-- #36 vm_exec_core (ec=0x55555555d1c0) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/redhat-linux-build/insns.def:822 #37 0x00007ffff7c739dd in rb_vm_exec (ec=0x55555555d1c0) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm.c:2472 #38 0x00007ffff7b358fb in require_internal (ec=ec@entry=0x55555555d1c0, fname=<optimized out>, fname@entry=140736882997040, exception=exception@entry=1, warn=false) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/load.c:1247 #39 0x00007ffff7b35e4e in rb_require_string_internal (fname=140736882997040) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/load.c:1346 #40 0x00007ffff7b35f08 in rb_require_string (fname=<optimized out>) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/load.c:1339 #41 0x00007ffff7c540c7 in vm_call_cfunc_with_frame_ (ec=0x55555555d1c0, reg_cfp=0x7ffff7670ec0, calling=<optimized out>, argc=<optimized out>, argv=<optimized out>, stack_bottom=<optimized out>) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm_insnhelper.c:3503 #42 0x00007ffff7c57193 in vm_call_alias (calling=0x7fffffffe040, cfp=0x7ffff7670ec0, ec=0x55555555d1c0) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm_insnhelper.c:3873 #43 vm_call_method_each_type (ec=0x55555555d1c0, cfp=0x7ffff7670ec0, calling=0x7fffffffe040) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm_insnhelper.c:4475 #44 0x00007ffff7c5b62c in vm_sendish (method_explorer=<optimized out>, block_handler=<optimized out>, cd=<optimized out>, reg_cfp=<optimized out>, ec=<optimized out>) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm_insnhelper.c:5581 #45 vm_exec_core (ec=0x55555555d1c0) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/redhat-linux-build/insns.def:822 #46 0x00007ffff7c73bfe in vm_exec_loop (result=<optimized out>, tag=0x7fffffffe0d0, state=<optimized out>, ec=0x55555555d1c0) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm.c:2499 #47 rb_vm_exec (ec=0x55555555d1c0) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/vm.c:2478 #48 0x00007ffff7adbc0a in rb_ec_exec_node (ec=ec@entry=0x55555555d1c0, n=n@entry=0x7fffdc3de580) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/eval.c:287 #49 0x00007ffff7addb03 in ruby_run_node (n=0x7fffdc3de580) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/eval.c:328 #50 0x0000555555555197 in rb_main (argv=0x7fffffffe4a8, argc=2) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/main.c:39 #51 main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/ruby-3.3.0~20231108.0143gitc8d4b103a9-183.fc40.285.x86_64/main.c:58 (gdb) p cfunc $1 = (const rb_method_cfunc_t *) 0xb (gdb) deta Detaching from program: /usr/bin/ruby-mri, process 345 /usr/share/rubygems/rubygems.rb:1220: [BUG] Segmentation fault at 0x000000000000001b ruby 3.3.0dev (2023-11-08 master c8d4b103a9) [x86_64-linux] -- Control frame information ----------------------------------------------- c:0022 p:---- s:0126 e:000125 CFUNC c:0021 p:0007 s:0123 e:000120 METHOD /usr/share/rubygems/rubygems.rb:1220 c:0020 p:0015 s:0115 e:000114 BLOCK <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:42 [FINISH] c:0019 p:---- s:0104 e:000103 [Inferior 1 (process 345) detached] CFUNC :synchronize c:0018 p:0017 s:0100 e:000099 METHOD <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:39 c:0017 p:0006 s:0094 e:000093 TOP /usr/share/gems/gems/sqlite3-1.6.1/lib/sqlite3/pragmas.rb:1 [FINISH] c:0016 p:---- s:0091 e:000090 CFUNC :require c:0015 p:0023 s:0086 e:000085 METHOD <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:128 c:0014 p:0020 s:0080 e:000079 TOP /usr/share/gems/gems/sqlite3-1.6.1/lib/sqlite3/database.rb:3 [FINISH] c:0013 p:---- s:0077 e:000076 CFUNC :require c:0012 p:0023 s:0072 e:000071 METHOD <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:128 c:0011 p:0033 s:0066 e:000065 TOP /usr/share/gems/gems/sqlite3-1.6.1/lib/sqlite3.rb:9 [FINISH] c:0010 p:---- s:0063 e:000062 CFUNC :require c:0009 p:0023 s:0058 e:000057 METHOD <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:128 c:0008 p:0078 s:0052 e:000051 TOP /usr/share/gems/gems/activerecord-7.0.8/lib/active_record/connection_adapters/sqlite3_adapter.rb:14 [FINISH] c:0007 p:---- s:0049 e:000048 CFUNC :require c:0006 p:0023 s:0044 e:000043 METHOD <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:128 c:0005 p:0051 s:0038 e:000037 METHOD /usr/share/gems/gems/activerecord-7.0.8/lib/active_record/connection_adapters/abstract/connection_handler.rb:268 c:0004 p:0066 s:0027 e:000026 METHOD /usr/share/gems/gems/activerecord-7.0.8/lib/active_record/connection_adapters/abstract/connection_handler.rb:129 c:0003 p:0049 s:0013 e:000012 METHOD /usr/share/gems/gems/activerecord-7.0.8/lib/active_record/connection_handling.rb:52 c:0002 p:0020 s:0006 e:000005 EVAL ./trial.rb:4 [FINISH] c:0001 p:0000 s:0003 E:0018a0 DUMMY [FINISH] -- Ruby level backtrace information ---------------------------------------- ./trial.rb:4:in `<main>' /usr/share/gems/gems/activerecord-7.0.8/lib/active_record/connection_handling.rb:52:in `establish_connection' /usr/share/gems/gems/activerecord-7.0.8/lib/active_record/connection_adapters/abstract/connection_handler.rb:129:in `establish_connection' /usr/share/gems/gems/activerecord-7.0.8/lib/active_record/connection_adapters/abstract/connection_handler.rb:268:in `resolve_pool_config' <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:128:in `require' <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:128:in `require' /usr/share/gems/gems/activerecord-7.0.8/lib/active_record/connection_adapters/sqlite3_adapter.rb:14:in `<top (required)>' <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:128:in `require' <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:128:in `require' /usr/share/gems/gems/sqlite3-1.6.1/lib/sqlite3.rb:9:in `<top (required)>' <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:128:in `require' <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:128:in `require' /usr/share/gems/gems/sqlite3-1.6.1/lib/sqlite3/database.rb:3:in `<top (required)>' <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:128:in `require' <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:128:in `require' /usr/share/gems/gems/sqlite3-1.6.1/lib/sqlite3/pragmas.rb:1:in `<top (required)>' <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:39:in `require' <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:39:in `synchronize' <internal:/usr/share/rubygems/rubygems/core_ext/kernel_require.rb>:42:in `block in require' /usr/share/rubygems/rubygems.rb:1220:in `find_unresolved_default_spec' ``` Looks like `cfunc` points to invalid address. Currently I am unable to minimize the code further... -- https://bugs.ruby-lang.org/