[ruby-dev:50107] [Ruby trunk Bug#12492] RUBY_DEBUG=gc_stress dumps core
From:
shyouhei@...
Date:
2017-05-09 07:27:22 UTC
List:
ruby-dev #50107
Issue #12492 has been updated by shyouhei (Shyouhei Urabe).
Backport changed from 2.1: DONTNEED, 2.2: DONTNEED, 2.3: DONTNEED to 2.1: REQUIRED, 2.2: REQUIRED, 2.3: REQUIRED
GCC 7が出ていたので試したところ再現したので、r55429 はバックポートが必要です。
```
% lldb -- miniruby -ve0
(lldb) target create "miniruby"
Current executable set to 'miniruby' (x86_64).
(lldb) settings set -- target.run-args "-ve0"
(lldb) run
Process 49206 launched: 'miniruby' (x86_64)
Process 49206 stopped
* thread #1: tid = 0xee0d7, 0x00000001001b2f3a miniruby`rb_const_defined(klass=4317686760, id=3579) + 106 at variable.c:3067, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x10)
frame #0: 0x00000001001b2f3a miniruby`rb_const_defined(klass=4317686760, id=3579) + 106 at variable.c:3067
3064 rb_const_entry_t *
3065 rb_const_lookup(VALUE klass, ID id)
3066 {
-> 3067 st_table *tbl = RCLASS_CONST_TBL(klass);
3068 st_data_t val;
3069
3070 if (tbl && st_lookup(tbl, (st_data_t)id, &val)) {
(lldb) bt
* thread #1: tid = 0xee0d7, 0x00000001001b2f3a miniruby`rb_const_defined(klass=4317686760, id=3579) + 106 at variable.c:3067, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x10)
* frame #0: 0x00000001001b2f3a miniruby`rb_const_defined(klass=4317686760, id=3579) + 106 at variable.c:3067
frame #1: 0x0000000100029358 miniruby`rb_define_module(name="Kernel") + 40 at class.c:771
frame #2: 0x00000001000d3907 miniruby`InitVM_Object + 263 at object.c:3412
frame #3: 0x000000010009523d miniruby`rb_call_inits + 29 at inits.c:23
frame #4: 0x00000001000630ee miniruby`ruby_setup + 190 at eval.c:60
frame #5: 0x0000000100063119 miniruby`ruby_init + 9 at eval.c:76
frame #6: 0x0000000100210ead miniruby`main(argc=<unavailable>, argv=<unavailable>) + 77 at main.c:35
frame #7: 0x00007fff972a35ad libdyld.dylib`start + 1
(lldb)
```
----------------------------------------
Bug #12492: RUBY_DEBUG=gc_stress dumps core
https://bugs.ruby-lang.org/issues/12492#change-64705
* Author: shyouhei (Shyouhei Urabe)
* Status: Closed
* Priority: Normal
* Assignee:
* Target version:
* ruby -v: ruby 2.4.0dev (2016-05-09 trunk 55419) [x86_64-darwin15]
* Backport: 2.1: REQUIRED, 2.2: REQUIRED, 2.3: REQUIRED
----------------------------------------
次のようにすると core を吐きます。
```
zsh % PATH="/usr/bin:$PATH" RUBY_DEBUG=gc_stress /usr/bin/lldb -- ./ruby -e 'p GC.stress'
(lldb) target create "./ruby"
Current executable set to './ruby' (x86_64).
(lldb) settings set -- target.run-args "-e" "p GC.stress"
(lldb) run
Process 15385 launched: './ruby' (x86_64)
Process 15385 stopped
* thread #1: tid = 0x5a843, 0x00000001001b4dda ruby`rb_const_defined(klass=4320291960, id=3643) + 106 at variable.c:3082, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x10)
frame #0: 0x00000001001b4dda ruby`rb_const_defined(klass=4320291960, id=3643) + 106 at variable.c:3082
3079 st_table *
3080 rb_st_copy(VALUE obj, struct st_table *orig_tbl)
3081 {
-> 3082 st_table *new_tbl = st_copy(orig_tbl);
3083 st_foreach(new_tbl, tbl_copy_i, (st_data_t)obj);
3084 return new_tbl;
3085 }
(lldb) bt
* thread #1: tid = 0x5a843, 0x00000001001b4dda ruby`rb_const_defined(klass=4320291960, id=3643) + 106 at variable.c:3082, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x10)
* frame #0: 0x00000001001b4dda ruby`rb_const_defined(klass=4320291960, id=3643) + 106 at variable.c:3082
frame #1: 0x000000010002d6b8 ruby`rb_define_module(name="Kernel") + 40 at class.c:773
frame #2: 0x00000001000d4287 ruby`InitVM_Object + 263 at object.c:3407
frame #3: 0x000000010009853d ruby`rb_call_inits + 29 at inits.c:23
frame #4: 0x000000010006789b ruby`ruby_setup + 155 at eval.c:60
frame #5: 0x0000000100067909 ruby`ruby_init + 9 at eval.c:76
frame #6: 0x000000010021369d ruby`main(argc=<unavailable>, argv=<unavailable>) + 77 at main.c:35
frame #7: 0x00007fff9c00f5ad libdyld.dylib`start + 1
frame #8: 0x00007fff9c00f5ad libdyld.dylib`start + 1
(lldb)
```
[ruby-dev:41536](http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-dev/41536) が再発しているのではないでしょうか。
--
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