Issue #15809 has been updated by MSP-Greg (Greg L).


@wanabe

Thank you for your work on this.  Today, I had the SEGV fault again during a ruby-loco build, and have found that running the two following test files will cause a SEGV:

```
drb/test_drbobject.rb  ruby/test_gc_compact.rb
```

I don't know if interaction with tests other than `drb/test_drbobject.rb` will cause a SEGV in `ruby/test_gc_compact.rb`.

`ruby/test_gc_compact.rb` seems to have been isolated in the CI here.  Up to now, ruby-loco has reliably passed test-all running parallel with retry.

I don't know c, and even if I did, I wouldn't want to jump into GC code.  Hence, I can't help with the issue.

It certainly seems incorrect to 'sweep the issue under the rug' via test isolation.  I can't think of any code in Ruby that should include a caveat something like "this may SEGV if you use it with an indeterminate set of classes/modules/methods...

I may isolate the drb test in ruby-loco and see what happens...

----------------------------------------
Bug #15809: GC.verify_compaction_references - intermittent SEGV's on multiple platforms
https://bugs.ruby-lang.org/issues/15809#change-78046

* Author: MSP-Greg (Greg L)
* Status: Assigned
* Priority: Normal
* Assignee: tenderlovemaking (Aaron Patterson)
* Target version: 
* ruby -v: ruby 2.7.0dev (2019-05-06 trunk c3cf1ef9bb) [x64-mingw32
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
See

https://travis-ci.org/ruby/ruby/jobs/525627187#L2684
https://ci.appveyor.com/project/ruby/ruby/builds/24138134/job/i7e441u7se11w7ey#L3402

Both have an error similar to:
```
/ruby/test/ruby/test_gc_compact.rb:128: [BUG] ROOT finalizers points to MOVED:
  0x0000000004679c20 -> 0x00000000089367c0 [0     ] T_ARRAY [E ] len: 1 (embed)
```

ruby-loco has also failed with a similar error.  Attached STDERR output.

---Files--------------------------------
test_all_err.log (42 KB)


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