[ruby-core:122096] [Ruby Bug#18412] Segfault in test_ractor.rb

14 May 2025

      Issue #18412 has been updated by byroot (Jean Boussier).

Status changed from Assigned to Closed

This report being about CI failures, I'm going to assume it was fixed otherwise we'd still see it today.

----------------------------------------
Bug #18412: Segfault in test_ractor.rb
https://bugs.ruby-lang.org/issues/18412#change-113250

* Author: vo.x (Vit Ondruch)
* Status: Closed
* Assignee: ractor
* ruby -v: ruby 3.0.3p157 (2021-11-24 revision 3fb7d2cadc) [powerpc64le-linux]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
During build of Ruby 3.0.3 for Fedora, I sometimes bump into this issue:

~~~
... snip ...

test_attr.rb             ..
test_autoload.rb         ........
test_block.rb            ..........................................................
test_class.rb            ................................................
test_env.rb              ..
test_eval.rb             .....................................
test_exception.rb        ..................................
test_fiber.rb            .....
test_finalizer.rb        .
test_flip.rb             .
test_flow.rb             ..............................................................
test_fork.rb             ....
test_gc.rb               ..
test_insns.rb            ...............................................................................................................................................................................................................................................................................................................................................................................................
test_io.rb               .........
test_jump.rb             .............................
test_literal.rb          ............................................................................................................................................................
test_literal_suffix.rb   ................................................
test_load.rb             ..
test_marshal.rb          .
test_massign.rb          ..................................
test_method.rb           ...............................................................................................................................................................................................................................
test_objectspace.rb      ......
test_proc.rb             .....................................
test_ractor.rb           .........................................................................................Fstderr output is not empty
   <internal:ractor>:627: [BUG] Segmentation fault at 0x0000000000000038
   ruby 3.0.3p157 (2021-11-24 revision 3fb7d2cadc) [powerpc64le-linux]

   -- Control frame information -----------------------------------------------
   c:0005 p:0003 s:0020 e:000019 METHOD <internal:ractor>:627
   c:0004 p:0032 s:0013 e:000012 BLOCK  bootstraptest.tmp.rb:6 [FINISH]
   c:0003 p:---- s:0010 e:000009 CFUNC  :loop
   c:0002 p:0005 s:0006 e:000005 BLOCK  bootstraptest.tmp.rb:4 [FINISH]
   c:0001 p:---- s:0003 e:000002 (none) [FINISH]

   -- Ruby level backtrace information ----------------------------------------
   bootstraptest.tmp.rb:4:in `block (2 levels) in <main>'
   bootstraptest.tmp.rb:4:in `loop'
   bootstraptest.tmp.rb:6:in `block (3 levels) in <main>'
   <internal:ractor>:627:in `yield'

   -- C level backtrace information -------------------------------------------
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_print_backtrace+0x24) [0x7fffb1dd3604] vm_dump.c:758
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_vm_bugreport.constprop.0+0x5c0) [0x7fffb1df1780] vm_dump.c:998
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_bug_for_fatal_signal+0xa4) [0x7fffb1bbdc74] error.c:786
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(sigsegv+0x68) [0x7fffb1d2a4a8] signal.c:963
   [0x7fffb1f80464]
   [0x7fffb191ad68]
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_native_mutex_lock+0x18) [0x7fffb1d6f558] thread_pthread.c:397
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(ractor_select+0x480) [0x7fffb1cda060] ractor.c:61
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(builtin_inline_class_627.lto_priv.0+0x50) [0x7fffb1cdaa30] ractor.c:1286
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(builtin_invoker0.lto_priv.0+0x24) [0x7fffb1db5624] vm_insnhelper.c:5445
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(vm_exec_core.lto_priv.0+0x254c) [0x7fffb1dbfe6c] insns.def:1493
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_vm_exec+0x130) [0x7fffb1ddc7e0] vm.c:2172
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(loop_i+0x2e4) [0x7fffb1dc7bd4] vm.c:1263
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_vrescue2+0xec) [0x7fffb1bbc6cc] eval.c:1019
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_rescue2+0x3c) [0x7fffb1bbc8bc] eval.c:996
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_f_loop.lto_priv.0+0x58) [0x7fffb1dc87c8] vm_eval.c:1483
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(ractor_safe_call_cfunc_0.lto_priv.0+0x24) [0x7fffb1da7904] vm_insnhelper.c:2748
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(vm_call_cfunc_with_frame+0x150) [0x7fffb1db2650] vm_insnhelper.c:2931
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(vm_sendish.lto_priv.0+0x3dc) [0x7fffb1db7b0c] vm_insnhelper.c:4532
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(vm_exec_core.lto_priv.0+0x1890) [0x7fffb1dbf1b0] insns.def:770
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_vm_exec+0x130) [0x7fffb1ddc7e0] vm.c:2172
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(vm_invoke_proc.lto_priv.0+0x2c0) [0x7fffb1dcfc90] vm.c:1263
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(thread_do_start_proc.lto_priv.0+0x5ac) [0x7fffb1d7852c] vm.c:1499
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(thread_start_func_2.constprop.0.isra.0+0x958) [0x7fffb1dfacf8] thread.c:759
   /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(thread_start_func_1+0x180) [0x7fffb1d70070] thread_pthread.c:994
   [0x7fffb1916264]
   [0x7fffb19c5f30]

   -- Other runtime information -----------------------------------------------

   * Loaded script: bootstraptest.tmp.rb

   * Loaded features:

       0 enumerator.so
       1 thread.rb
       2 rational.so
       3 complex.so
       4 ruby2_keywords.rb
       5 /builddir/build/BUILD/ruby-3.0.3/.ext/powerpc64le-linux/enc/encdb.so
       6 /builddir/build/BUILD/ruby-3.0.3/.ext/powerpc64le-linux/enc/trans/transdb.so
       7 /builddir/build/BUILD/ruby-3.0.3/abrt.rb

   * Process memory map:

   102330000-102340000 r--p 00000000 fc:06 1076662947                       /builddir/build/BUILD/ruby-3.0.3/ruby
   102340000-102350000 r-xp 00010000 fc:06 1076662947                       /builddir/build/BUILD/ruby-3.0.3/ruby
   102350000-102360000 r--p 00020000 fc:06 1076662947                       /builddir/build/BUILD/ruby-3.0.3/ruby
   102360000-102370000 r--p 00020000 fc:06 1076662947                       /builddir/build/BUILD/ruby-3.0.3/ruby
   102370000-102380000 rw-p 00030000 fc:06 1076662947                       /builddir/build/BUILD/ruby-3.0.3/ruby
   134320000-134530000 rw-p 00000000 00:00 0                                [heap]
   7fff88000000-7fff88bd0000 rw-p 00000000 00:00 0 
   7fff88bd0000-7fff8c000000 ---p 00000000 00:00 0 
   7fff8c000000-7fff8cd90000 rw-p 00000000 00:00 0 
   7fff8cd90000-7fff90000000 ---p 00000000 00:00 0 
   7fff90000000-7fff901e0000 rw-p 00000000 00:00 0 
   7fff901e0000-7fff94000000 ---p 00000000 00:00 0 
   7fff94000000-7fff94be0000 rw-p 00000000 00:00 0 
   7fff94be0000-7fff98000000 ---p 00000000 00:00 0 
   7fff98000000-7fff99320000 rw-p 00000000 00:00 0 
   7fff99320000-7fff9c000000 ---p 00000000 00:00 0 
   7fff9c000000-7fff9cc40000 rw-p 00000000 00:00 0 
   7fff9cc40000-7fffa0000000 ---p 00000000 00:00 0 
   7fffa0000000-7fffa0d60000 rw-p 00000000 00:00 0 
   7fffa0d60000-7fffa4000000 ---p 00000000 00:00 0 
   7fffa7ed0000-7fffa7ee0000 ---p 00000000 00:00 0 
   7fffa7ee0000-7fffa8000000 rw-p 00000000 00:00 0 
   7fffa8000000-7fffa91a0000 rw-p 00000000 00:00 0 
   7fffa91a0000-7fffac000000 ---p 00000000 00:00 0 
   7fffada60000-7fffadaa0000 r--s 00000000 fc:06 1076662947                 /builddir/build/BUILD/ruby-3.0.3/ruby
   7fffadaa0000-7fffadab0000 r--p 00000000 fc:06 1614754146                 /usr/lib64/libgcc_s-11-20211203.so.1
   7fffadab0000-7fffadac0000 r-xp 00010000 fc:06 1614754146                 /usr/lib64/libgcc_s-11-20211203.so.1
   7fffadac0000-7fffadad0000 r--p 00020000 fc:06 1614754146                 /usr/lib64/libgcc_s-11-20211203.so.1
   7fffadad0000-7fffadae0000 r--p 00020000 fc:06 1614754146                 /usr/lib64/libgcc_s-11-20211203.so.1
   7fffadae0000-7fffadaf0000 rw-p 00030000 fc:06 1614754146                 /usr/lib64/libgcc_s-11-20211203.so.1
   7fffadaf0000-7fffadb00000 ---p 00000000 00:00 0 
   7fffadb00000-7fffadc20000 rw-p 00000000 00:00 0 
   7fffadc20000-7fffadc30000 ---p 00000000 00:00 0 
   7fffadc30000-7fffadd50000 rw-p 00000000 00:00 0 
   7fffadd50000-7fffadd60000 ---p 00000000 00:00 0 
   7fffadd60000-7fffade80000 rw-p 00000000 00:00 0 
   7fffade80000-7fffade90000 ---p 00000000 00:00 0 
   7fffade90000-7fffadfb0000 rw-p 00000000 00:00 0 
   7fffadfb0000-7fffadfc0000 ---p 00000000 00:00 0 
   7fffadfc0000-7fffae0e0000 rw-p 00000000 00:00 0 
   7fffae0e0000-7fffae0f0000 ---p 00000000 00:00 0 
   7fffae0f0000-7fffae210000 rw-p 00000000 00:00 0 
   7fffae210000-7fffae220000 ---p 00000000 00:00 0 
   7fffae220000-7fffae340000 rw-p 00000000 00:00 0 
   7fffae340000-7fffae350000 r--p 00000000 fc:06 1616770133                 /builddir/build/BUILD/ruby-3.0.3/.ext/powerpc64le-linux/enc/trans/transdb.so
   7fffae350000-7fffae360000 r-xp 00010000 fc:06 1616770133                 /builddir/build/BUILD/ruby-3.0.3/.ext/powerpc64le-linux/enc/trans/transdb.so
   7fffae360000-7fffae370000 r--p 00020000 fc:06 1616770133                 /builddir/build/BUILD/ruby-3.0.3/.ext/powerpc64le-linux/enc/trans/transdb.so
   7fffae370000-7fffae380000 r--p 00020000 fc:06 1616770133                 /builddir/build/BUILD/ruby-3.0.3/.ext/powerpc64le-linux/enc/trans/transdb.so
   7fffae380000-7fffae390000 rw-p 00000000 00:00 0 
   7fffae390000-7fffae3a0000 r--p 00000000 fc:06 1076646137                 /builddir/build/BUILD/ruby-3.0.3/.ext/powerpc64le-linux/enc/encdb.so
   7fffae3a0000-7fffae3b0000 r-xp 00010000 fc:06 1076646137                 /builddir/build/BUILD/ruby-3.0.3/.ext/powerpc64le-linux/enc/encdb.so
   7fffae3b0000-7fffae3c0000 r--p 00020000 fc:06 1076646137                 /builddir/build/BUILD/ruby-3.0.3/.ext/powerpc64le-linux/enc/encdb.so
   7fffae3c0000-7fffae3d0000 r--p 00020000 fc:06 1076646137                 /builddir/build/BUILD/ruby-3.0.3/.ext/powerpc64le-linux/enc/encdb.so
   7fffae3d0000-7fffae3e0000 rw-p 00000000 00:00 0 
   7fffae3e0000-7fffae3f0000 ---p 00000000 00:00 0 
   7fffae3f0000-7fffae460000 rw-p 00000000 00:00 0 
   7fffae460000-7fffae470000 ---p 00000000 00:00 0 
   7fffae470000-7fffae4e0000 rw-p 00000000 00:00 0 
   7fffae4e0000-7fffae4f0000 ---p 00000000 00:00 0 
   7fffae4f0000-7fffae560000 rw-p 00000000 00:00 0 
   7fffae560000-7fffae570000 ---p 00000000 00:00 0 
   7fffae570000-7fffae5e0000 rw-p 00000000 00:00 0 
   7fffae5e0000-7fffae5f0000 ---p 00000000 00:00 0 
   7fffae5f0000-7fffae660000 rw-p 00000000 00:00 0 
   7fffae660000-7fffae670000 ---p 00000000 00:00 0 
   7fffae670000-7fffae6e0000 rw-p 00000000 00:00 0 
   7fffae6e0000-7fffae6f0000 ---p 00000000 00:00 0 
   7fffae6f0000-7fffae760000 rw-p 00000000 00:00 0 
   7fffae760000-7fffae770000 ---p 00000000 00:00 0 
   7fffae770000-7fffae7e0000 rw-p 00000000 00:00 0 
   7fffae7e0000-7fffae7f0000 ---p 00000000 00:00 0 
   7fffae7f0000-7fffae860000 rw-p 00000000 00:00 0 
   7fffae860000-7fffae870000 ---p 00000000 00:00 0 
   7fffae870000-7fffae8e0000 rw-p 00000000 00:00 0 
   7fffae8e0000-7fffae8f0000 ---p 00000000 00:00 0 
   7fffae8f0000-7fffae960000 rw-p 00000000 00:00 0 
   7fffae960000-7fffae970000 ---p 00000000 00:00 0 
   7fffae970000-7fffae9e0000 rw-p 00000000 00:00 0 
   7fffae9e0000-7fffae9f0000 ---p 00000000 00:00 0 
   7fffae9f0000-7fffaea60000 rw-p 00000000 00:00 0 
   7fffaea60000-7fffaea70000 ---p 00000000 00:00 0 
   7fffaea70000-7fffaeae0000 rw-p 00000000 00:00 0 
   7fffaeae0000-7fffaeaf0000 ---p 00000000 00:00 0 
   7fffaeaf0000-7fffaeb60000 rw-p 00000000 00:00 0 
   7fffaeb60000-7fffaeb70000 ---p 00000000 00:00 0 
   7fffaeb70000-7fffaebe0000 rw-p 00000000 00:00 0 
   7fffaebe0000-7fffaebf0000 ---p 00000000 00:00 0 
   7fffaebf0000-7fffaec60000 rw-p 00000000 00:00 0 
   7fffaec60000-7fffaec70000 ---p 00000000 00:00 0 
   7fffaec70000-7fffaece0000 rw-p 00000000 00:00 0 
   7fffaece0000-7fffaecf0000 ---p 00000000 00:00 0 
   7fffaecf0000-7fffaed60000 rw-p 00000000 00:00 0 
   7fffaed60000-7fffaed70000 ---p 00000000 00:00 0 
   7fffaed70000-7fffaede0000 rw-p 00000000 00:00 0 
   7fffaede0000-7fffaedf0000 ---p 00000000 00:00 0 
   7fffaedf0000-7fffaee60000 rw-p 00000000 00:00 0 
   7fffaee60000-7fffaee70000 ---p 00000000 00:00 0 
   7fffaee70000-7fffaeee0000 rw-p 00000000 00:00 0 
   7fffaeee0000-7fffaeef0000 ---p 00000000 00:00 0 
   7fffaeef0000-7fffaef60000 rw-p 00000000 00:00 0 
   7fffaef60000-7fffaef70000 ---p 00000000 00:00 0 
   7fffaef70000-7fffaefe0000 rw-p 00000000 00:00 0 
   7fffaefe0000-7fffaeff0000 ---p 00000000 00:00 0 
   7fffaeff0000-7fffaf060000 rw-p 00000000 00:00 0 
   7fffaf060000-7fffaf070000 ---p 00000000 00:00 0 
   7fffaf070000-7fffaf0e0000 rw-p 00000000 00:00 0 
   7fffaf0e0000-7fffaf0f0000 ---p 00000000 00:00 0 
   7fffaf0f0000-7fffaf160000 rw-p 00000000 00:00 0 
   7fffaf160000-7fffaf170000 ---p 00000000 00:00 0 
   7fffaf170000-7fffaf1e0000 rw-p 00000000 00:00 0 
   7fffaf1e0000-7fffaf1f0000 ---p 00000000 00:00 0 
   7fffaf1f0000-7fffaf260000 rw-p 00000000 00:00 0 
   7fffaf260000-7fffaf270000 ---p 00000000 00:00 0 
   7fffaf270000-7fffaf2e0000 rw-p 00000000 00:00 0 
   7fffaf2e0000-7fffaf2f0000 ---p 00000000 00:00 0 
   7fffaf2f0000-7fffaf360000 rw-p 00000000 00:00 0 
   7fffaf360000-7fffaf370000 ---p 00000000 00:00 0 
   7fffaf370000-7fffb1570000 rw-p 00000000 00:00 0 
   7fffb1570000-7fffb1590000 r--p 00000000 fc:06 1615030600                 /usr/lib64/libm.so.6
   7fffb1590000-7fffb1650000 r-xp 00020000 fc:06 1615030600                 /usr/lib64/libm.so.6
   7fffb1650000-7fffb16b0000 r--p 000e0000 fc:06 1615030600                 /usr/lib64/libm.so.6
   7fffb16b0000-7fffb16c0000 r--p 00130000 fc:06 1615030600                 /usr/lib64/libm.so.6
   7fffb16c0000-7fffb16d0000 rw-p 00140000 fc:06 1615030600                 /usr/lib64/libm.so.6
   7fffb16d0000-7fffb16e0000 r--p 00000000 fc:06 1615031006                 /usr/lib64/libcrypt.so.2.0.0
   7fffb16e0000-7fffb1700000 r-xp 00010000 fc:06 1615031006                 /usr/lib64/libcrypt.so.2.0.0
   7fffb1700000-7fffb1720000 r--p 00030000 fc:06 1615031006                 /usr/lib64/libcrypt.so.2.0.0
   7fffb1720000-7fffb1730000 r--p 00040000 fc:06 1615031006                 /usr/lib64/libcrypt.so.2.0.0
   7fffb1730000-7fffb1740000 rw-p 00000000 00:00 0 
   7fffb1740000-7fffb1750000 r--p 00000000 fc:06 1615031014                 /usr/lib64/libgmp.so.10.4.1
   7fffb1750000-7fffb17d0000 r-xp 00010000 fc:06 1615031014                 /usr/lib64/libgmp.so.10.4.1
   7fffb17d0000-7fffb17f0000 r--p 00090000 fc:06 1615031014                 /usr/lib64/libgmp.so.10.4.1
   7fffb17f0000-7fffb1800000 r--p 000a0000 fc:06 1615031014                 /usr/lib64/libgmp.so.10.4.1
   7fffb1800000-7fffb1810000 rw-p 000b0000 fc:06 1615031014                 /usr/lib64/libgmp.so.10.4.1
   7fffb1810000-7fffb1830000 r-xp 00000000 fc:06 1615030899                 /usr/lib64/libz.so.1.2.11
   7fffb1830000-7fffb1840000 r--p 00010000 fc:06 1615030899                 /usr/lib64/libz.so.1.2.11
   7fffb1840000-7fffb1850000 rw-p 00020000 fc:06 1615030899                 /usr/lib64/libz.so.1.2.11
   7fffb1850000-7fffb1890000 r--p 00000000 fc:06 1615030597                 /usr/lib64/libc.so.6
   7fffb1890000-7fffb1a40000 r-xp 00040000 fc:06 1615030597                 /usr/lib64/libc.so.6
   7fffb1a40000-7fffb1ab0000 r--p 001f0000 fc:06 1615030597                 /usr/lib64/libc.so.6
   7fffb1ab0000-7fffb1ac0000 r--p 00250000 fc:06 1615030597                 /usr/lib64/libc.so.6
   7fffb1ac0000-7fffb1ad0000 rw-p 00260000 fc:06 1615030597                 /usr/lib64/libc.so.6
   7fffb1ae0000-7fffb1b20000 r--p 00000000 fc:06 1077936030                 /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3
   7fffb1b20000-7fffb1e10000 r-xp 00040000 fc:06 1077936030                 /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3
   7fffb1e10000-7fffb1f20000 r--p 00330000 fc:06 1077936030                 /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3
   7fffb1f20000-7fffb1f30000 ---p 00440000 fc:06 1077936030                 /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3
   7fffb1f30000-7fffb1f40000 r--p 00440000 fc:06 1077936030                 /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3
   7fffb1f40000-7fffb1f50000 rw-p 00450000 fc:06 1077936030                 /builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3
   7fffb1f50000-7fffb1f60000 rw-p 00000000 00:00 0 
   7fffb1f60000-7fffb1f80000 r--p 00000000 00:00 0                          [vvar]
   7fffb1f80000-7fffb1f90000 r-xp 00000000 00:00 0                          [vdso]
   7fffb1f90000-7fffb1fa0000 r--p 00000000 fc:06 1615030592                 /usr/lib64/ld64.so.2
   7fffb1fa0000-7fffb1ff0000 r-xp 00010000 fc:06 1615030592                 /usr/lib64/ld64.so.2
   7fffb1ff0000-7fffb2000000 r--p 00060000 fc:06 1615030592                 /usr/lib64/ld64.so.2
   7fffb2000000-7fffb2010000 r--p 00060000 fc:06 1615030592                 /usr/lib64/ld64.so.2
   7fffb2010000-7fffb2020000 rw-p 00070000 fc:06 1615030592                 /usr/lib64/ld64.so.2
   7fffd3830000-7fffd4030000 rw-p 00000000 00:00 0                          [stack]
test_string.rb           .
test_struct.rb           .
test_syntax.rb           ............................................................................................................................................................
test_thread.rb           .................................................
Fiber count: 10000 (skipping)
#1282 test_ractor.rb:1405:in `<top (required)>': 
     workers = (0...8).map do
       Ractor.new do
         loop do
           10_000.times.map { Object.new }
           Ractor.yield Time.now
         end
       end
     end

     1_000.times { idle_worker, tmp_reporter = Ractor.select(*workers) }
     "ok"
  #=> "" (expected "ok")  
FAIL 1/1489 tests failed
make: *** [uncommon.mk:767: yes-btest-ruby] Error 1

... snip ...
~~~

It reminds me #18117, but that should be fixed, right?

-- 
https://bugs.ruby-lang.org/