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From: "byroot (Jean Boussier) via ruby-core"
Date: 2025-05-09T16:19:09+00:00
Subject: [ruby-core:121941] [Ruby Bug#21315] Finalizers violate the `rb_ractor_confirm_belonging` assertion
Issue #21315 has been reported by byroot (Jean Boussier).
----------------------------------------
Bug #21315: Finalizers violate the `rb_ractor_confirm_belonging` assertion
https://bugs.ruby-lang.org/issues/21315
* Author: byroot (Jean Boussier)
* Status: Open
* Assignee: ractor
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
Reproduction (with assertions enabled):
```ruby
require "tempfile"
Ractor.new do
10.times do
Tempfile.new
end
end.take
GC.start
```
```
(File)
/home/runner/work/ruby/ruby/src/lib/tempfile.rb:387: [BUG] rb_ractor_confirm_belonging object-ractor id:1, current-ractor id:2
ruby 3.5.0dev (2025-05-09T15:51:24Z pull/13291/merge e289a1dc58) +PRISM [x86_64-linux]
-- Control frame information -----------------------------------------------
c:0005 p:0007 s:0025 e:000024 METHOD /home/runner/work/ruby/ruby/src/lib/tempfile.rb:387 [FINISH]
c:0004 p:0022 s:0020 e:000019 METHOD /home/runner/work/ruby/ruby/src/lib/prism/parse_result.rb:833 [FINISH]
c:0003 p:---- s:0012 e:000011 CFUNC :parse_lex_file
c:0002 p:0006 s:0007 e:000006 BLOCK /home/runner/work/ruby/ruby/src/test/prism/ractor_test.rb:26 [FINISH]
c:0001 p:---- s:0003 e:000002 DUMMY [FINISH]
-- Ruby level backtrace information ----------------------------------------
/home/runner/work/ruby/ruby/src/test/prism/ractor_test.rb:26:in 'block in test_parse_lex_file'
/home/runner/work/ruby/ruby/src/test/prism/ractor_test.rb:26:in 'parse_lex_file'
/home/runner/work/ruby/ruby/src/lib/prism/parse_result.rb:833:in 'initialize'
/home/runner/work/ruby/ruby/src/lib/tempfile.rb:387:in 'call'
-- Threading information ---------------------------------------------------
Total ractor count: 2
Ruby thread count for this ractor: 1
-- C level backtrace information -------------------------------------------
/home/runner/work/ruby/ruby/build/ruby(rb_print_backtrace+0x14) [0x561441aeedbf] ../src/vm_dump.c:843
/home/runner/work/ruby/ruby/build/ruby(rb_vm_bugreport) ../src/vm_dump.c:1175
/home/runner/work/ruby/ruby/build/ruby(bug_report_end+0x0) [0x561441aa3f39] ../src/error.c:1097
/home/runner/work/ruby/ruby/build/ruby(rb_bug_without_die_internal) ../src/error.c:1097
/home/runner/work/ruby/ruby/build/ruby(die+0x0) [0x5614416e237f] ../src/error.c:1115
/home/runner/work/ruby/ruby/build/ruby(rb_bug) ../src/error.c:1117
/home/runner/work/ruby/ruby/build/ruby(rb_ractor_confirm_belonging+0xde) [0x56144188c6be] ../src/ractor_core.h:376
/home/runner/work/ruby/ruby/build/ruby(vm_exec_core+0xef) [0x5614418b23ef] /home/runner/work/ruby/ruby/build/vm.inc:2500
/home/runner/work/ruby/ruby/build/ruby(rb_vm_exec+0x156) [0x5614418a4676] ../src/vm.c:2618
/home/runner/work/ruby/ruby/build/ruby(vm_call0_cc+0x13d) [0x5614418aa1dd] ../src/vm_eval.c:101
/home/runner/work/ruby/ruby/build/ruby(rb_vm_call0+0x4c) [0x5614418b1cc5] ../src/vm_eval.c:61
/home/runner/work/ruby/ruby/build/ruby(rb_vm_call_kw) ../src/vm_eval.c:326
/home/runner/work/ruby/ruby/build/ruby(rb_check_funcall_default_kw) ../src/vm_eval.c:694
/home/runner/work/ruby/ruby/build/ruby(rb_gc_run_obj_finalizer+0x1cf) [0x56144170220f] ../src/gc.c:306
/home/runner/work/ruby/ruby/build/ruby(rb_multi_ractor_p+0x0) [0x56144170246f] ../src/gc/default/default.c:2820
/home/runner/work/ruby/ruby/build/ruby(rb_vm_lock_enter) ../src/vm_sync.h:74
/home/runner/work/ruby/ruby/build/ruby(rb_gc_vm_lock) ../src/gc.c:137
/home/runner/work/ruby/ruby/build/ruby(finalize_list) ../src/gc/default/default.c:2843
/home/runner/work/ruby/ruby/build/ruby(finalize_deferred_heap_pages) ../src/gc/default/default.c:2866
```
I think it wouldn't be hard to disable that check when running a finalizer, but I don't know if it's the correct thing to do.
--
https://bugs.ruby-lang.org/
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