Issue #15809 has been updated by wanabe (_ wanabe).


Recursive finalizer definition raises a similar error on my environment.

```
$ ./miniruby -ve 'def foo(c = 10); ObjectSpace.define_finalizer(Object.new) { foo(c - 1) } if c > 0; end; 10.times do foo; GC.verify_compaction_references end'
ruby 2.7.0dev (2019-05-06 trunk c3cf1ef9bb) [x86_64-linux]
-e:1: [BUG] ROOT finalizers points to MOVED: 0x000055eb4bfdfd18 -> 0x000055eb4c041040 [0     ] T_ARRAY [E ] len: 1 (embed)

ruby 2.7.0dev (2019-05-06 trunk c3cf1ef9bb) [x86_64-linux]

-- Control frame information -----------------------------------------------
c:0005 p:---- s:0017 e:000016 CFUNC  :verify_compaction_references
c:0004 p:0016 s:0013 e:000012 BLOCK  -e:1 [FINISH]
c:0003 p:---- s:0010 e:000009 CFUNC  :times
(snip)
```

Note: this script is inspired by "lib/drb/timeridconv.rb".

----------------------------------------
Bug #15809: GC.verify_compaction_references - intermittent SEGV's on multiple platforms
https://bugs.ruby-lang.org/issues/15809#change-77946

* 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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