Issue #17667 has been updated by jeremyevans0 (Jeremy Evans). Status changed from Open to Closed This appears to have been fixed between Ruby 3.1 and 3.2. Ruby 3.0 and 3.1 both instantly crash with the given example, whereas Ruby 3.2 does not crash even if given a minute. ---------------------------------------- Bug #17667: Module#name needs synchronization https://bugs.ruby-lang.org/issues/17667#change-104302 * Author: ko1 (Koichi Sasada) * Status: Closed * Priority: Normal * Assignee: ko1 (Koichi Sasada) * ruby -v: ruby 3.1.0dev (2021-02-28T11:24:42Z master 80e2c45f55) [x86_64-linux] * Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN ---------------------------------------- ```ruby class C; @iv = 1; end Ractor.new{ loop{C.name} } class C 0.step{|i| instance_variable_set("@iv#{i}", i)} end ``` ``` /home/ko1/ruby/src/trunk/test.rb:4: [BUG] Segmentation fault at 0x000056513df4ef10 ruby 3.1.0dev (2021-02-28T11:24:42Z master 80e2c45f55) [x86_64-linux] -- Control frame information ----------------------------------------------- c:0005 p:---- s:0017 e:000016 CFUNC :name c:0004 p:0011 s:0013 e:000012 BLOCK /home/ko1/ruby/src/trunk/test.rb:4 [FINISH] c:0003 p:---- s:0010 e:000009 CFUNC :loop c:0002 p:0004 s:0006 e:000005 BLOCK /home/ko1/ruby/src/trunk/test.rb:4 [FINISH] c:0001 p:---- s:0003 e:000002 (none) [FINISH] -- Ruby level backtrace information ---------------------------------------- /home/ko1/ruby/src/trunk/test.rb:4:in `block in <main>' /home/ko1/ruby/src/trunk/test.rb:4:in `loop' /home/ko1/ruby/src/trunk/test.rb:4:in `block (2 levels) in <main>' /home/ko1/ruby/src/trunk/test.rb:4:in `name' -- Machine register context ------------------------------------------------ RIP: 0x000056513dbe09dc RBP: 0x000000000000000e RSP: 0x00007f96276e2140 RAX: 0x000056513df4ef10 RBX: 0x0000000000001238 RCX: 0x000000000000000d RDX: 0x0000000000000ee1 RDI: 0x000056513de6f040 RSI: 0x0000000000000001 R8: 0x000056513deedb00 R9: 0x000056513dec70c0 R10: 0x0000000000000000 R11: 0x00007f96276e2d29 R12: 0x00000000000040d8 R13: 0x000056513dea2470 R14: 0x00000000000076d5 R15: 0xffffffffffffffff EFL: 0x0000000000010206 -- C level backtrace information ------------------------------------------- /home/ko1/ruby/build/trunk/miniruby(rb_print_backtrace+0x11) [0x56513dc7e67e] /home/ko1/ruby/src/trunk/vm_dump.c:758 /home/ko1/ruby/build/trunk/miniruby(rb_vm_bugreport) /home/ko1/ruby/src/trunk/vm_dump.c:1042 /home/ko1/ruby/build/trunk/miniruby(rb_bug_for_fatal_signal+0xf4) [0x56513da892e4] /home/ko1/ruby/src/trunk/error.c:801 /home/ko1/ruby/build/trunk/miniruby(sigsegv+0x4d) [0x56513dbd5cbd] /home/ko1/ruby/src/trunk/signal.c:960 /lib/x86_64-linux-gnu/libpthread.so.0(__restore_rt+0x0) [0x7f962b7283c0] ../sysdeps/pthread/funlockfile.c:28 /home/ko1/ruby/build/trunk/miniruby(find_table_entry_ind+0x5c) [0x56513dbe09dc] /home/ko1/ruby/src/trunk/st.c:839 /home/ko1/ruby/build/trunk/miniruby(rb_st_lookup+0x4a) [0x56513dbe16fa] /home/ko1/ruby/src/trunk/st.c:1021 /home/ko1/ruby/build/trunk/miniruby(classname+0x79) [0x56513dc46380] /home/ko1/ruby/src/trunk/variable.c:102 /home/ko1/ruby/build/trunk/miniruby(rb_mod_name+0x32) [0x56513dc46405] /home/ko1/ruby/src/trunk/variable.c:121 /home/ko1/ruby/build/trunk/miniruby(vm_call_cfunc_with_frame+0x11b) [0x56513dc562eb] /home/ko1/ruby/src/trunk/vm_insnhelper.c:2924 /home/ko1/ruby/build/trunk/miniruby(vm_sendish+0xe) [0x56513dc63957] /home/ko1/ruby/src/trunk/vm_insnhelper.c:4525 ``` -- https://bugs.ruby-lang.org/