Issue #15784 has been reported by shyouhei (Shyouhei Urabe).

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Bug #15784: RUBY_DEBUG=gc_stress dumps core
https://bugs.ruby-lang.org/issues/15784

* Author: shyouhei (Shyouhei Urabe)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 2.7
* ruby -v: ruby 2.7.0dev (2019-04-23 trunk 87cf45a512) [x86_64-linux]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
```
% RUBY_DEBUG=gc_stress gdb --args ./miniruby -vep
GNU gdb (Ubuntu 8.1-0ubuntu3) 8.1.0.20180409-git
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
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Reading symbols from ./miniruby...done.
(gdb) run
Starting program: /home/shyouhei/data/build/ruby@clang-9/trunk@git/miniruby -vep
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
rb_vm_mark (ptr=0x555555ad8b20) at /home/shyouhei/data/src/trunk/vm.c:2231
2231            len = RARRAY_LEN(vm->mark_object_ary);
(gdb) bt
#0  rb_vm_mark (ptr=0x555555ad8b20) at /home/shyouhei/data/src/trunk/vm.c:2231
#1  0x000055555562d545 in gc_mark_roots (objspace=0x555555ad9280, categoryp=0x0) at /home/shyouhei/data/src/trunk/gc.c:5258
#2  0x0000555555633c92 in gc_marks_start (objspace=<optimized out>, full_mark=<optimized out>) at /home/shyouhei/data/src/trunk/gc.c:5880
#3  gc_marks (objspace=<optimized out>, full_mark=<optimized out>) at /home/shyouhei/data/src/trunk/gc.c:6158
#4  gc_start (objspace=<optimized out>, reason=<optimized out>) at /home/shyouhei/data/src/trunk/gc.c:6965
#5  0x000055555562da70 in garbage_collect (objspace=0x555555ad9280, reason=45568) at /home/shyouhei/data/src/trunk/gc.c:6860
#6  garbage_collect_with_gvl (objspace=0x555555ad9280, reason=45568) at /home/shyouhei/data/src/trunk/gc.c:7118
#7  objspace_malloc_gc_stress (objspace=0x555555ad9280) at /home/shyouhei/data/src/trunk/gc.c:9261
#8  objspace_xmalloc0 (objspace=0x555555ad9280, size=56) at /home/shyouhei/data/src/trunk/gc.c:9407
#9  0x0000555555734ebb in st_init_table_with_size (type=<optimized out>, size=0) at /home/shyouhei/data/src/trunk/st.c:596
#10 st_init_table (type=<optimized out>) at /home/shyouhei/data/src/trunk/st.c:626
#11 st_init_numtable () at /home/shyouhei/data/src/trunk/st.c:634
#12 0x00005555556267fd in Init_heap () at /home/shyouhei/data/src/trunk/gc.c:2584
#13 0x0000555555616e22 in ruby_setup () at /home/shyouhei/data/src/trunk/eval.c:68
#14 0x0000555555616f36 in ruby_init () at /home/shyouhei/data/src/trunk/eval.c:91
#15 0x000055555557a62b in main (argc=2, argv=0x7fffffffc998) at /home/shyouhei/data/src/trunk/main.c:41
(gdb) rp vm->mark_object_ary
false
```



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