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Bug #8492

closed

ObjectSpace.after_gc_start_hook aborts with GC.stress

Added by naruse (Yui NARUSE) almost 11 years ago. Updated over 10 years ago.

Status:
Closed
Target version:
ruby -v:
ruby 2.1.0dev (2013-06-05 trunk 41080) [x86_64-freebsd9.1]
[ruby-dev:47400]

Description

以下を実行すると assert(during_gc > 0) に失敗して abort します。
ruby -robjspace -e'ObjectSpace.after_gc_start_hook=proc{};GC.stress=true;{}'
gc.c:3818 の
gc_event_hook(objspace, RUBY_INTERNAL_EVENT_GC_START, 0 /* TODO: pass minor/immediate flag? */);
実行後に、during_gc が 0 になっている模様。

Updated by ko1 (Koichi Sasada) over 10 years ago

随分放置してしまってすみません。
これ、今でもなりますか? 手元ではなんか

$ ./ruby -robjspace -e'ObjectSpace.after_gc_start_hook=proc{};GC.stress=true;{}'
セグメンテーション違反です

などと出てしまう。これはこれでまずかろう、という気もしますが...。

Actions #2

Updated by nobu (Nobuyoshi Nakada) over 10 years ago

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

This issue was solved with changeset r43245.
Yui, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.


vm_trace.c: fix infinite hook

  • thread.c (rb_threadptr_execute_interrupts): flush postponed job only
    once at last.
  • vm_trace.c (rb_postponed_job_flush): defer calling postponed jobs
    registered while flushing to get rid of infinite reentrance of
    ObjectSpace.after_gc_start_hook. [ruby-dev:47400] [Bug #8492]

Updated by nagachika (Tomoyuki Chikanaga) over 10 years ago

  • Backport changed from 1.9.3: UNKNOWN, 2.0.0: UNKNOWN to 1.9.3: DONTNEED, 2.0.0: DONTNEED
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