Bug #10933: [BUG] object allocation during garbage collection phase

• Status: Closed
• Assignee: nobu (Nobuyoshi Nakada)
• Target version: -
• ruby -v: ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-darwin14]
• Backport: 2.0.0: DONTNEED, 2.1: DONTNEED, 2.2: DONE

[yoshuki (Yoshiyuki MIKAMI)]

いつもお世話になっています。
rspec中に遭遇して、その後繰り返しても再現しないのですが、役に立てばと採取できたログをお送りします。
追加で提出すべき情報があればお知らせください。
よろしくお願いいたします。

[yoshuki (Yoshiyuki MIKAMI)]

I encountered non-recurring bug during rspec.
I hope attached files will help.
If I should send extra information abount this bug, please let me know.

Thanks,

[ko1 (Koichi Sasada)]

• Assignee set to nobu (Nobuyoshi Nakada)

ありがとうございます。とてもわかりやすいログでした。

• cleanup フェーズに入る
  • sweep_rest を行なう（lazy sweep の後始末を行なう）
    • ここで、GC 中フラグが立ち、オブジェクト割り当てが禁止される
    • dynamic symbol の free を行なう
      • rb_hash_delete_entry() が走る
        • st_delete() 中で rb_any_cmp() -> rb_eql() -> rb_funcall() が呼ばれる
          • compare 処理を行なう
          • interrupt が走り、ファイナライザが起動される
            • run_finalizer() 中で配列を作る（ここでは ruby-level ファイナライザが起動されるので、これに限らない）
              • [BUG]

ということで、2.2.1 で導入されたバグだということがわかりました。ありがとうございます。

[yoshuki (Yoshiyuki MIKAMI)]

早速のレスありがとうございました。よろしくお願いします！

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed
• % Done changed from 0 to 100

Applied in changeset r49842.

---

symbol.c: make dsym_fstrs an identity hash

• symbol.c (Init_sym): make dsym_fstrs a hash compared by identity
  as the keys are unique fstrings, to get rid of running hash and
  compare methods and causing new object allocation during garbage
  collection phase. [ruby-dev:48891] [Bug #10933]

[nobu (Nobuyoshi Nakada)]

• Backport changed from 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN to 2.0.0: DONTNEED, 2.1: DONTNEED, 2.2: REQUIRED

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.0.0: DONTNEED, 2.1: DONTNEED, 2.2: REQUIRED to 2.0.0: DONTNEED, 2.1: DONTNEED, 2.2: DONE

Backported into ruby_2_2 branch at r50493.

[nobu (Nobuyoshi Nakada)]

• Has duplicate Bug #11168: object allocation during garbage collection phase when rake assets:precompile on 2.2.2 added

[nobu (Nobuyoshi Nakada)]

• Has duplicate Bug #11351: Random chrash [BUG] object allocation during garbage collection phase added

[nobu (Nobuyoshi Nakada)]

• Has duplicate Bug #11354: Ruby Crash while added

[nobu (Nobuyoshi Nakada)]

• Has duplicate Bug #11411: Crash in rb_gc_mark() during Rails app boot with GC.stress=1 added

[nobu (Nobuyoshi Nakada)]

• Has duplicate deleted (Bug #11411: Crash in rb_gc_mark() during Rails app boot with GC.stress=1)

[nobu (Nobuyoshi Nakada)]

• Has duplicate Bug #12067: [BUG] object allocation during garbage collection phase added

[vo.x (Vit Ondruch)]

Hi, just wondering that since this patch appears to fix this issue, is there a chance that somebody would provide more details how to actually systematically reproduce this issue?

[mame (Yusuke Endoh)]

• Has duplicate Bug #15959: Bug in the Ruby interpreter or extension libraries added