[ruby-core:106547] [Ruby master Bug#18133] LTO: TestGCCompact#test_ast_compacts segfaults on i686

Issue #18133 has been updated by vo.x (Vit Ondruch).

Status changed from Closed to Assigned

Thanks for looking into this. However, applying these two patches, while fixing i686, it breaks ppc64le :(

~~~
[ 8890/21266] TestGCCompact#test_ast_compacts<internal:gc>:213: [BUG] Couldn't unprotect page 0x0000000140f98000
ruby 3.0.3p157 (2021-11-24 revision 3fb7d2cadc) [powerpc64le-linux]
-- Control frame information -----------------------------------------------
c:0031 p:0003 s:0175 e:000174 METHOD <internal:gc>:213
c:0030 p:0031 s:0171 e:000169 METHOD /builddir/build/BUILD/ruby-3.0.3/test/ruby/test_gc_compact.rb:146
c:0029 p:0052 s:0165 e:000164 METHOD /builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:1283
c:0028 p:0065 s:0159 e:000158 METHOD /builddir/build/BUILD/ruby-3.0.3/tool/lib/minitest/unit.rb:1330
c:0027 p:0013 s:0150 e:000149 METHOD /builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit/testcase.rb:18
c:0026 p:0077 s:0145 e:000144 BLOCK  /builddir/build/BUILD/ruby-3.0.3/tool/lib/minitest/unit.rb:979 [FINISH]
c:0025 p:---- s:0138 e:000137 CFUNC  :map
c:0024 p:0006 s:0134 e:000133 BLOCK  /builddir/build/BUILD/ruby-3.0.3/tool/lib/minitest/unit.rb:972
c:0023 p:0186 s:0130 E:001920 METHOD /builddir/build/BUILD/ruby-3.0.3/tool/lib/minitest/unit.rb:999
c:0022 p:0042 s:0118 e:000117 METHOD /builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:1136
c:0021 p:0010 s:0111 e:000109 BLOCK  /builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:627 [FINISH]
c:0020 p:---- s:0105 e:000104 CFUNC  :each
c:0019 p:0054 s:0101 E:000198 METHOD /builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:625
c:0018 p:0008 s:0094 E:001178 METHOD /builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:662
c:0017 p:0140 s:0087 E:0000b8 METHOD /builddir/build/BUILD/ruby-3.0.3/tool/lib/minitest/unit.rb:908
c:0016 p:0016 s:0074 E:001018 METHOD /builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:1073
c:0015 p:0005 s:0069 E:000910 METHOD /builddir/build/BUILD/ruby-3.0.3/tool/lib/minitest/unit.rb:1147
c:0014 p:0006 s:0065 E:001a48 BLOCK  /builddir/build/BUILD/ruby-3.0.3/tool/lib/minitest/unit.rb:1134 [FINISH]
c:0013 p:---- s:0061 e:000060 CFUNC  :each
c:0012 p:0047 s:0057 E:0015b8 METHOD /builddir/build/BUILD/ruby-3.0.3/tool/lib/minitest/unit.rb:1133
c:0011 p:0013 s:0052 E:001af8 METHOD /builddir/build/BUILD/ruby-3.0.3/tool/lib/minitest/unit.rb:1121
c:0010 p:0008 s:0047 E:001750 METHOD /builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:847
c:0009 p:0008 s:0041 E:0024a0 METHOD /builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:695
c:0008 p:0015 s:0035 E:0019f8 METHOD /builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:34
c:0007 p:0006 s:0030 E:0010d8 METHOD /builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:1175
c:0006 p:0032 s:0025 E:000580 METHOD /builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:1245
c:0005 p:0009 s:0021 E:000098 METHOD /builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:1249
c:0004 p:0172 s:0016 E:001be8 TOP    /builddir/build/BUILD/ruby-3.0.3/tool/test/runner.rb:23 [FINISH]
c:0003 p:---- s:0011 e:000010 CFUNC  :require_relative
c:0002 p:0092 s:0006 E:000ff0 EVAL   ./test/runner.rb:11 [FINISH]
c:0001 p:0000 s:0003 E:001730 (none) [FINISH]
-- Ruby level backtrace information ----------------------------------------
./test/runner.rb:11:in `<main>'
./test/runner.rb:11:in `require_relative'
/builddir/build/BUILD/ruby-3.0.3/tool/test/runner.rb:23:in `<top (required)>'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:1249:in `run'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:1245:in `run'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:1175:in `run'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:34:in `run'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:695:in `run'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:847:in `run'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/minitest/unit.rb:1121:in `run'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/minitest/unit.rb:1133:in `_run'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/minitest/unit.rb:1133:in `each'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/minitest/unit.rb:1134:in `block in _run'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/minitest/unit.rb:1147:in `run_tests'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:1073:in `_run_anything'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/minitest/unit.rb:908:in `_run_anything'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:662:in `_run_suites'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:625:in `_run_suites'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:625:in `each'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:627:in `block in _run_suites'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:1136:in `_run_suite'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/minitest/unit.rb:999:in `_run_suite'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/minitest/unit.rb:972:in `block in _run_suite'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/minitest/unit.rb:972:in `map'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/minitest/unit.rb:979:in `block (2 levels) in _run_suite'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit/testcase.rb:18:in `run'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/minitest/unit.rb:1330:in `run'
/builddir/build/BUILD/ruby-3.0.3/tool/lib/test/unit.rb:1283:in `run_test'
/builddir/build/BUILD/ruby-3.0.3/test/ruby/test_gc_compact.rb:146:in `test_ast_compacts'
<internal:gc>:213:in `compact'
-- C level backtrace information -------------------------------------------
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_print_backtrace+0x24) [0x7fff89f83424] vm_dump.c:758
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_vm_bugreport.constprop.0+0x5c0) [0x7fff89fa1520] vm_dump.c:998
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_bug+0xa4) [0x7fff89cdbed8] error.c:763
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(gc_sweep_step.isra.0+0x1c60) [0x7fff89fb15f0] gc.c:4505
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(gc_sweep.lto_priv.0+0x13c) [0x7fff89d8fb0c] gc.c:5153
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(gc_start.lto_priv.0+0xb10) [0x7fff89d9ba40] gc.c:7465
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(garbage_collect.lto_priv.0+0x60) [0x7fff89d9bea0] gc.c:8202
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(gc_compact.lto_priv.0+0x48) [0x7fff89d9c528] gc.c:8545
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(builtin_invoker0.lto_priv.0+0x24) [0x7fff89f65444] vm_insnhelper.c:5445
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(vm_exec_core.lto_priv.0+0x24f8) [0x7fff89f6fc38] insns.def:1482
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_vm_exec+0x130) [0x7fff89f8c580] vm.c:2172
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_yield+0x2f8) [0x7fff89f774c8] vm.c:1263
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_ary_collect.lto_priv.0+0x74) [0x7fff89ce4944] array.c:3635
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(ractor_safe_call_cfunc_0.lto_priv.0+0x24) [0x7fff89f57724] vm_insnhelper.c:2748
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(vm_call_cfunc_with_frame+0x150) [0x7fff89f62470] vm_insnhelper.c:2931
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(vm_sendish.lto_priv.0+0x3dc) [0x7fff89f6792c] vm_insnhelper.c:4532
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(vm_exec_core.lto_priv.0+0x1890) [0x7fff89f6efd0] insns.def:770
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_vm_exec+0x130) [0x7fff89f8c580] vm.c:2172
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_yield+0x2f8) [0x7fff89f774c8] vm.c:1263
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_ary_each+0x54) [0x7fff89ce45b4] array.c:2523
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(ractor_safe_call_cfunc_0.lto_priv.0+0x24) [0x7fff89f57724] vm_insnhelper.c:2748
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(vm_call_cfunc_with_frame+0x150) [0x7fff89f62470] vm_insnhelper.c:2931
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(vm_call_method_each_type+0x6e8) [0x7fff89f632a8] vm_insnhelper.c:3400
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(vm_sendish.lto_priv.0+0x3dc) [0x7fff89f6792c] vm_insnhelper.c:4532
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(vm_exec_core.lto_priv.0+0x1890) [0x7fff89f6efd0] insns.def:770
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_vm_exec+0x130) [0x7fff89f8c580] vm.c:2172
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_yield+0x2f8) [0x7fff89f774c8] vm.c:1263
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_ary_each+0x54) [0x7fff89ce45b4] array.c:2523
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(ractor_safe_call_cfunc_0.lto_priv.0+0x24) [0x7fff89f57724] vm_insnhelper.c:2748
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(vm_call_cfunc_with_frame+0x150) [0x7fff89f62470] vm_insnhelper.c:2931
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(vm_call_method_each_type+0x6e8) [0x7fff89f632a8] vm_insnhelper.c:3400
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(vm_sendish.lto_priv.0+0x3dc) [0x7fff89f6792c] vm_insnhelper.c:4532
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(vm_exec_core.lto_priv.0+0x1890) [0x7fff89f6efd0] insns.def:770
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_vm_exec+0x130) [0x7fff89f8c580] vm.c:2172
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_iseq_eval+0x158) [0x7fff89f8da88] vm.c:2409
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(load_iseq_eval+0x1a0) [0x7fff89dda870] load.c:638
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(require_internal.lto_priv.0+0xa2c) [0x7fff89ddc93c] load.c:1109
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_require_string+0x44) [0x7fff89ddcb44] load.c:1186
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_f_require_relative+0x78) [0x7fff89ddcc88] load.c:901
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(ractor_safe_call_cfunc_1.lto_priv.0+0x28) [0x7fff89f57778] vm_insnhelper.c:2755
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(vm_call_cfunc_with_frame+0x150) [0x7fff89f62470] vm_insnhelper.c:2931
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(vm_sendish.lto_priv.0+0x3dc) [0x7fff89f6792c] vm_insnhelper.c:4532
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(vm_exec_core.lto_priv.0+0x16c) [0x7fff89f6d8ac] insns.def:789
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_vm_exec+0x130) [0x7fff89f8c580] vm.c:2172
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_iseq_eval_main+0xf0) [0x7fff89f8dbd0] vm.c:2420
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(rb_ec_exec_node+0xb0) [0x7fff89d73c30] eval.c:317
/builddir/build/BUILD/ruby-3.0.3/libruby.so.3.0.3(ruby_run_node+0x7c) [0x7fff89d73d8c] eval.c:375
/builddir/build/BUILD/ruby-3.0.3/ruby(main+0x78) [0x10ca50228] ./main.c:50
~~~

However, it is probably fixed in master, because I have not hit this issue while testing Ruby 3.1.0.

For the time being, the build is available [here](https://koji.fedoraproject.org/koji/taskinfo?taskID=79712765) and this is the [build.log](https://kojipkgs.fedoraproject.org//work/tasks/2906/79712906/build.log)

----------------------------------------
Bug #18133: LTO: TestGCCompact#test_ast_compacts segfaults on i686
https://bugs.ruby-lang.org/issues/18133#change-95211

* Author: vo.x (Vit Ondruch)
* Status: Assigned
* Priority: Normal
* ruby -v: ruby 3.0.2p107 (2021-07-07 revision 0db68f0233) [i386-linux]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
I observe following segfault running the test suite on i686 on RHEL9:

~~~
$ gdb --args ./miniruby -I./lib -I. -I.ext/common  ./tool/runruby.rb --extout=.ext  -- --disable-gems ./test/runner.rb --excludes-dir=./test/excludes -v

... snip ...

(gdb) handle SIGPIPE noprint nostop pass
Signal        Stop	Print	Pass to program	Description
SIGPIPE       No	No	Yes		Broken pipe
(gdb) r

... snip ...

[ 8347/20497] TestGBK#test_mbc_enc_len = 0.00 s
[ 8348/20497] TestGBK#test_mbc_to_code = 0.00 s
[ 8349/20497] TestGCCompact#test_ast_compacts--Type <RET> for more, q to quit, c to continue without paging--

Thread 1 "ruby" received signal SIGSEGV, Segmentation fault.
0xf7e33fe6 in rb_class_remove_from_super_subclasses (klass=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/class.c:96
96		    RCLASS_EXT(entry->next->klass)->parent_subclasses = RCLASS_EXT(klass)->parent_subclasses;
(gdb) bt
#0  0xf7e33fe6 in rb_class_remove_from_super_subclasses (klass=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/class.c:96
#1  obj_free (obj=<optimized out>, objspace=0x5655ac30) at /builddir/build/BUILD/ruby-3.0.2/gc.c:3019
#2  gc_page_sweep (sweep_page=0x5a40e1f0, heap=0x5655ac48, objspace=0x5655ac30) at /builddir/build/BUILD/ruby-3.0.2/gc.c:4914
#3  gc_sweep_step.isra.0 (objspace=<optimized out>, heap=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/gc.c:5134
#4  0xf7ca3f09 in gc_sweep_rest (objspace=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/gc.c:5190
#5  gc_sweep (objspace=0x5655ac30) at /builddir/build/BUILD/ruby-3.0.2/gc.c:5313
#6  0xf7ca8250 in gc_marks (full_mark=<optimized out>, objspace=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/gc.c:7504
#7  gc_start (objspace=<optimized out>, reason=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/gc.c:8322
#8  0xf7ca8530 in garbage_collect (objspace=objspace@entry=0x5655ac30, reason=reason@entry=238592) at /builddir/build/BUILD/ruby-3.0.2/gc.c:8210
#9  0xf7caa723 in gc_start_internal (compact=2, immediate_sweep=2, immediate_mark=2, full_mark=2, self=1448715280, ec=0x5655afac) at /builddir/build/BUILD/ruby-3.0.2/gc.c:8553
#10 gc_compact (ec=0x5655afac, self=1448715280) at /builddir/build/BUILD/ruby-3.0.2/gc.c:9468
#11 0xf7dfae3c in invoke_bf (argv=0x0, bf=<optimized out>, reg_cfp=<optimized out>, ec=0x5655afac) at /builddir/build/BUILD/ruby-3.0.2/vm_insnhelper.c:5583
#12 vm_invoke_builtin_delegate (ec=0x5655afac, cfp=<optimized out>, bf=<optimized out>, start_index=0) at /builddir/build/BUILD/ruby-3.0.2/vm_insnhelper.c:5607
#13 0xf7e0664c in vm_exec_core (ec=0x0, initial=1448732852) at /builddir/build/BUILD/ruby-3.0.2/insns.def:1482
#14 0xf7e1d0d5 in rb_vm_exec (ec=<optimized out>, mjit_enable_p=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/vm.c:2172
#15 0xf7e0c3c9 in invoke_block (captured=<optimized out>, captured=<optimized out>, opt_pc=<optimized out>, type=<optimized out>, cref=0x0, self=1450588460, iseq=0x5669174c, ec=0x5655afac)
    at /builddir/build/BUILD/ruby-3.0.2/vm_insnhelper.c:399
#16 invoke_iseq_block_from_c (me=0x0, is_lambda=<optimized out>, cref=0x0, passed_block_handler=0, kw_splat=0, argv=0xffffbf00, argc=1, self=1450588460, captured=<optimized out>, ec=0x5655afac)
    at /builddir/build/BUILD/ruby-3.0.2/vm.c:1335
#17 invoke_block_from_c_bh (force_blockarg=<optimized out>, is_lambda=<optimized out>, cref=<optimized out>, passed_block_handler=<optimized out>, kw_splat=<optimized out>, argv=<optimized out>, 
    argc=<optimized out>, block_handler=<optimized out>, ec=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/vm.c:1353
#18 vm_yield (kw_splat=0, argv=0xffffbf00, argc=1, ec=0x5655afac) at /builddir/build/BUILD/ruby-3.0.2/vm.c:1398
#19 rb_yield_0 (argv=0xffffbf00, argc=1) at /builddir/build/BUILD/ruby-3.0.2/vm_eval.c:1333
#20 rb_yield (val=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/vm_eval.c:1349
#21 0xf7c2ae74 in rb_ary_collect (ary=1503666180) at /builddir/build/BUILD/ruby-3.0.2/array.c:3635
#22 0xf7dfc835 in vm_call_cfunc_with_frame (ec=0x5655afac, reg_cfp=0xf77f6d70, calling=0xffffc004) at /builddir/build/BUILD/ruby-3.0.2/vm_insnhelper.c:2929
#23 0xf7dfdd31 in vm_sendish (ec=0x5655afac, reg_cfp=0xf77f6d70, cd=0x566c8f00, block_handler=4152323453, method_explorer=mexp_search_method) at /builddir/build/BUILD/ruby-3.0.2/vm_callinfo.h:336
#24 0xf7e0590a in vm_exec_core (ec=0x0, initial=1448732852) at /builddir/build/BUILD/ruby-3.0.2/insns.def:770
#25 0xf7e1d0d5 in rb_vm_exec (ec=<optimized out>, mjit_enable_p=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/vm.c:2172
#26 0xf7e0c3c9 in invoke_block (captured=<optimized out>, captured=<optimized out>, opt_pc=<optimized out>, type=<optimized out>, cref=0x0, self=1450588460, iseq=0x56691850, ec=0x5655afac)
    at /builddir/build/BUILD/ruby-3.0.2/vm_insnhelper.c:399
#27 invoke_iseq_block_from_c (me=0x0, is_lambda=<optimized out>, cref=0x0, passed_block_handler=0, kw_splat=0, argv=0xffffc2b0, argc=1, self=1450588460, captured=<optimized out>, ec=0x5655afac)
    at /builddir/build/BUILD/ruby-3.0.2/vm.c:1335
#28 invoke_block_from_c_bh (force_blockarg=<optimized out>, is_lambda=<optimized out>, cref=<optimized out>, passed_block_handler=<optimized out>, kw_splat=<optimized out>, argv=<optimized out>, 
    argc=<optimized out>, block_handler=<optimized out>, ec=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/vm.c:1353
#29 vm_yield (kw_splat=0, argv=0xffffc2b0, argc=1, ec=0x5655afac) at /builddir/build/BUILD/ruby-3.0.2/vm.c:1398
#30 rb_yield_0 (argv=0xffffc2b0, argc=1) at /builddir/build/BUILD/ruby-3.0.2/vm_eval.c:1333
#31 rb_yield (val=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/vm_eval.c:1349
#32 0xf7c2ac4a in rb_ary_each (ary=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/array.c:2523
#33 rb_ary_each (ary=1501058480) at /builddir/build/BUILD/ruby-3.0.2/array.c:2517
#34 0xf7dfc835 in vm_call_cfunc_with_frame (ec=0x5655afac, reg_cfp=0xf77f6dfc, calling=0xffffc474) at /builddir/build/BUILD/ruby-3.0.2/vm_insnhelper.c:2929
#35 0xf7e00602 in vm_call_method_each_type (ec=0x5655afac, cfp=0xf77f6dfc, calling=0xffffc474) at /builddir/build/BUILD/ruby-3.0.2/vm_insnhelper.c:3419
#36 0xf7e00a46 in vm_call_refined (calling=<optimized out>, cfp=0xf77f6dfc, ec=0x5655afac) at /builddir/build/BUILD/ruby-3.0.2/vm_insnhelper.c:3398
#37 vm_call_method_each_type (ec=0x5655afac, cfp=0xf77f6dfc, calling=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/vm_insnhelper.c:3476
#38 0xf7dfdd31 in vm_sendish (ec=0x5655afac, reg_cfp=0xf77f6dfc, cd=0x5669f510, block_handler=4152323593, method_explorer=mexp_search_method) at /builddir/build/BUILD/ruby-3.0.2/vm_callinfo.h:336
#39 0xf7e0590a in vm_exec_core (ec=0x0, initial=1448732852) at /builddir/build/BUILD/ruby-3.0.2/insns.def:770
#40 0xf7e1d0d5 in rb_vm_exec (ec=<optimized out>, mjit_enable_p=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/vm.c:2172
#41 0xf7e0c3c9 in invoke_block (captured=<optimized out>, captured=<optimized out>, opt_pc=<optimized out>, type=<optimized out>, cref=0x0, self=1450588460, iseq=0x566900cc, ec=0x5655afac)
    at /builddir/build/BUILD/ruby-3.0.2/vm_insnhelper.c:399
#42 invoke_iseq_block_from_c (me=0x0, is_lambda=<optimized out>, cref=0x0, passed_block_handler=0, kw_splat=0, argv=0xffffc720, argc=1, self=1450588460, captured=<optimized out>, ec=0x5655afac)
    at /builddir/build/BUILD/ruby-3.0.2/vm.c:1335
#43 invoke_block_from_c_bh (force_blockarg=<optimized out>, is_lambda=<optimized out>, cref=<optimized out>, passed_block_handler=<optimized out>, kw_splat=<optimized out>, argv=<optimized out>, 
    argc=<optimized out>, block_handler=<optimized out>, ec=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/vm.c:1353
#44 vm_yield (kw_splat=0, argv=0xffffc720, argc=1, ec=0x5655afac) at /builddir/build/BUILD/ruby-3.0.2/vm.c:1398
#45 rb_yield_0 (argv=0xffffc720, argc=1) at /builddir/build/BUILD/ruby-3.0.2/vm_eval.c:1333
#46 rb_yield (val=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/vm_eval.c:1349
#47 0xf7c2ac4a in rb_ary_each (ary=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/array.c:2523
--Type <RET> for more, q to quit, c to continue without paging--
#48 rb_ary_each (ary=1501058920) at /builddir/build/BUILD/ruby-3.0.2/array.c:2517
#49 0xf7dfc835 in vm_call_cfunc_with_frame (ec=0x5655afac, reg_cfp=0xf77f6ec0, calling=0xffffc8e4) at /builddir/build/BUILD/ruby-3.0.2/vm_insnhelper.c:2929
#50 0xf7e00602 in vm_call_method_each_type (ec=0x5655afac, cfp=0xf77f6ec0, calling=0xffffc8e4) at /builddir/build/BUILD/ruby-3.0.2/vm_insnhelper.c:3419
#51 0xf7e00a46 in vm_call_refined (calling=<optimized out>, cfp=0xf77f6ec0, ec=0x5655afac) at /builddir/build/BUILD/ruby-3.0.2/vm_insnhelper.c:3398
#52 vm_call_method_each_type (ec=0x5655afac, cfp=0xf77f6ec0, calling=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/vm_insnhelper.c:3476
#53 0xf7dfdd31 in vm_sendish (ec=0x5655afac, reg_cfp=0xf77f6ec0, cd=0x566cbca0, block_handler=4152323789, method_explorer=mexp_search_method) at /builddir/build/BUILD/ruby-3.0.2/vm_callinfo.h:336
#54 0xf7e0590a in vm_exec_core (ec=0x0, initial=1448732852) at /builddir/build/BUILD/ruby-3.0.2/insns.def:770
#55 0xf7e1d0d5 in rb_vm_exec (ec=<optimized out>, mjit_enable_p=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/vm.c:2172
#56 0xf7e1da4e in rb_iseq_eval (iseq=0x5657ad18) at /builddir/build/BUILD/ruby-3.0.2/vm.c:2409
#57 0xf7cdb23e in load_iseq_eval (ec=0x5655afac, fname=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/load.c:594
#58 0xf7ce0ef8 in require_internal (ec=<optimized out>, fname=<optimized out>, exception=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/load.c:1065
#59 0xf7ce10ce in rb_require_string (fname=1448587920) at /builddir/build/BUILD/ruby-3.0.2/load.c:1142
#60 0xf7ce117c in rb_f_require_relative (obj=1448845900, fname=1448588380) at /builddir/build/BUILD/ruby-3.0.2/load.c:857
#61 0xf7dfc835 in vm_call_cfunc_with_frame (ec=0x5655afac, reg_cfp=0xf77f6fd8, calling=0xffffce04) at /builddir/build/BUILD/ruby-3.0.2/vm_insnhelper.c:2929
#62 0xf7e00602 in vm_call_method_each_type (ec=0x5655afac, cfp=0xf77f6fd8, calling=0xffffce04) at /builddir/build/BUILD/ruby-3.0.2/vm_insnhelper.c:3419
#63 0xf7dfdd31 in vm_sendish (ec=0x5655afac, reg_cfp=0xf77f6fd8, cd=0x56616828, block_handler=0, method_explorer=mexp_search_method) at /builddir/build/BUILD/ruby-3.0.2/vm_callinfo.h:336
#64 0xf7e04d92 in vm_exec_core (ec=0x0, initial=1448732852) at /builddir/build/BUILD/ruby-3.0.2/insns.def:789
#65 0xf7e1d0d5 in rb_vm_exec (ec=<optimized out>, mjit_enable_p=<optimized out>) at /builddir/build/BUILD/ruby-3.0.2/vm.c:2172
#66 0xf7e1db19 in rb_iseq_eval_main (iseq=0x5657b63c) at /builddir/build/BUILD/ruby-3.0.2/vm.c:2420
#67 0xf7c91b99 in rb_ec_exec_node (ec=ec@entry=0x5655afac, n=n@entry=0x5657b63c) at /builddir/build/BUILD/ruby-3.0.2/eval.c:317
#68 0xf7c964fa in ruby_run_node (n=0x5657b63c) at /builddir/build/BUILD/ruby-3.0.2/eval.c:375
#69 0x56556143 in main (argc=<optimized out>, argv=<optimized out>) at ./main.c:50
~~~

Unfortunately:

1) I don' have better reproducer then to run the whole test suite and even then it is not triggered always. I was not successful to hit the issue running just the single test case or the test file.
2) I have failed to reproduce this on CentOS Stream 9, which is surprising.

Luckily, I can reproduce it on my system.

This is seems to be related to LTO, because I have never faced such issue with LTO disabled.



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