[ruby-core:81069] [Ruby trunk Bug#13236] Ruby segfault

Issue #13236 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 2.2: DONTNEED, 2.3: DONE, 2.4: REQUIRED to 2.2: DONTNEED, 2.3: DONE, 2.4: DONE

ruby_2_4 r58632 merged revision(s) 58082,58083.

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Bug #13236: Ruby segfault
https://bugs.ruby-lang.org/issues/13236#change-64720

* Author: Gondolin (Damien Robert)
* Status: Closed
* Priority: Normal
* Assignee: shugo (Shugo Maeda)
* Target version: 
* ruby -v: ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-linux]
* Backport: 2.2: DONTNEED, 2.3: DONE, 2.4: DONE
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I have a program that segfault under certain conditions. It does not happen often, so it is hard to get the segfault.
The code is in https://github.com/DamienRobert/drain
You can run 'rake test' to (sometime, not often) get the core dump. I was able to get the coredump across different computers and different ruby versions.
In the tests I construct a graph with a cyclic path, so there is probably a bug in the gc when there are cyclic dependencies.

I join a coredump (compressed with xz), here is the backtrace (not very usefull because I did not compile ruby with debugging symbols):

```
Core was generated by `/usr/bin/ruby -w -Ilib:test -I/usr/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib /us'.
Program terminated with signal SIGABRT, Aborted.
#0  0x00007facdff1304f in raise () from /usr/lib/libc.so.6
[Current thread is 1 (Thread 0x7face08fe700 (LWP 7251))]
(gdb) bt
#0  0x00007facdff1304f in raise () from /usr/lib/libc.so.6
#1  0x00007facdff1447a in abort () from /usr/lib/libc.so.6
#2  0x00007face03096e1 in ?? () from /usr/lib/libruby.so.2.4
#3  0x00007face03c50ee in ?? () from /usr/lib/libruby.so.2.4
#4  <signal handler called>
#5  0x00007face02c9b44 in ?? () from /usr/lib/libruby.so.2.4
#6  0x00007face0321d0d in ?? () from /usr/lib/libruby.so.2.4
#7  0x00007face0322f13 in ?? () from /usr/lib/libruby.so.2.4
#8  0x00007face032515d in rb_gc_call_finalizer_at_exit ()
   from /usr/lib/libruby.so.2.4
#9  0x00007face03104c4 in ruby_cleanup () from /usr/lib/libruby.so.2.4
#10 0x00007face0310645 in ruby_run_node () from /usr/lib/libruby.so.2.4
#11 0x00000000004007cb in ?? ()
#12 0x00007facdff00291 in __libc_start_main () from /usr/lib/libc.so.6
#13 0x00000000004007fa in _start ()
```

---Files--------------------------------
ruby.coredump.xz (1.1 MB)


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