From: "hsbt (Hiroshi SHIBATA) via ruby-core" <ruby-core@...>
Date: 2025-04-02T08:58:16+00:00
Subject: [ruby-core:121511] [Ruby Bug#21204] `TestEtc#test_ractor_parallel` is still flaky result with ModGC/MMTk

Issue #21204 has been updated by hsbt (Hiroshi SHIBATA).


`TestSocket#test_timestamp` is failed sometimes on ModGC workflow.

```
    1) Failure:
  TestSocket#test_timestamp [/home/runner/work/ruby/ruby/src/test/socket/test_socket.rb:493]:
  <[[#<Socket:fd 7>], [], []]> expected but was
  <nil>.
```

https://github.com/ruby/ruby/actions/runs/14212913556/job/39823279828?pr=13037

----------------------------------------
Bug #21204: `TestEtc#test_ractor_parallel` is still flaky result with ModGC/MMTk
https://bugs.ruby-lang.org/issues/21204#change-112535

* Author: hsbt (Hiroshi SHIBATA)
* Status: Assigned
* Assignee: eightbitraptor (Matt V-H)
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
https://github.com/ruby/ruby/actions/runs/14121185441/job/39561623937?pr=13004

```
    1) Failure:
  TestEtc#test_ractor_parallel [/home/runner/work/ruby/ruby/src/test/etc/test_etc.rb:178]:
  pid 150540 killed by SIGABRT (signal 6) (core dumped)
  | [BUG] pthread_mutex_lock: Owner died (EOWNERDEAD)
  | ruby 3.5.0dev (2025-03-28T03:13:46Z pull/13004/merge 4cfbc634ea) +PRISM +GC[mmtk] [x86_64-linux]
  | 
  | -- Control frame information -----------------------------------------------
  | 
  | malloc_consolidate(): unaligned fastbin chunk detected
  | 
  | -- Threading information ---------------------------------------------------
  | Total ractor count: 1
```



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