[ruby-core:89820] Ruby 2.5.x SegFaulting on OS X in GC

Hi all,

We recently upgraded to Ruby 2.5.3 and our developers started seeing 
SegFaults in random place when working with our app. There doesn’t 
seem to be any pattern to where it happens at our application level, but 
all of the C level backtraces point back to the same place.

-- C level backtrace information 
-------------------------------------------
0   libruby.2.5.dylib                   0x0000000105542f37 
rb_vm_bugreport + 135
1   libruby.2.5.dylib                   0x00000001053b8bd3 
rb_bug_context + 467
2   libruby.2.5.dylib                   0x00000001054b0ee1 sigsegv + 81
3   libsystem_platform.dylib            0x00007fff62dbab3d _sigtramp + 
29
4   libruby.2.5.dylib                   0x00000001053d2f63 
rb_gc_mark_machine_stack + 99
5   libruby.2.5.dylib                   0x0000000105531449 
rb_execution_context_mark + 137
6   libruby.2.5.dylib                   0x000000010539f50b cont_mark + 
27
7   libruby.2.5.dylib                   0x00000001053de49e gc_marks_rest 
+ 94
8   libruby.2.5.dylib                   0x00000001053dcb60 gc_start + 
2880

All of the crashes have been at rb_gc_mark_machine_stack + 99

I’ve filed a bug at ruby-lang.org 
(https://bugs.ruby-lang.org/issues/15308).

It looks like there have been many other similar reports, all of the 
having that rb_gc_mark_machine_stack + 99 in common
https://bugs.ruby-lang.org/issues/14714
https://bugs.ruby-lang.org/issues/14334

Has there been any progress on resolving this issue? I realize that Ruby 
is an open source volunteer project, but having the current version of 
Ruby segfaulting consistently on a major operating system seems like a 
big deal. I would hate to be stuck on Ruby 2.4 forever.

Thanks,

Andrew Selder

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