From: keiju@... (=?ISO-2022-JP?B?GyRCQFBETTc9PHkbKEI=?=)
Date: 2010-10-15T20:40:11+09:00
Subject: [ruby-dev:42399] [locking_mutex must be NULL] Re:  Re: [BUG: trunk] Lazy sweep and ObjectSpace.each_object

けいじゅ＠いしつかです.

In [ruby-dev:42396] the message: "[ruby-dev:42396] Re: [BUG: trunk]
Lazy sweep and ObjectSpace.each_object", on Oct/15 17:26(JST) SASADA
Koichi writes:

>　ささだです。

>> ちょっとお聞きしたいんですけど, この問題って, どの辺りのバージョンから
>> 入っています?
>
>　1.9.3 以降です。

そうですか, 残念.

ところで, 添付のようなエラーが出てSEGVしちゃうんですけど, 原因が何か分
かります?

何をやっているかというと, 親プロセスから子プロセスをforkしていて, 子側
がSEGVしています.

親側では, threadとかmutexを使っていて色々と非同期処理をしています.
fork後, 子側でそのthreadがGCされるときに発生しているみたいなんですが...

非同期処理をしながらforkするところに無理があるって話もありそうなんです
が...

それと, このバックトレースではeach_object中に発生していますが, その前
に GC.start を入れると, そこで発生します.


-- ここから
/var/projects/fairy/fairy/lib/fairy/share/base-app.rb:94: [BUG] thread_free: locking_mutex must be NULL (0x87fd5f0:138337388)
ruby 1.9.1p430 (2010-08-16 revision 28998) [i686-linux]

-- control frame ----------
c:0015 p:0015 s:0049 b:0048 l:000031 d:000047 BLOCK  /var/projects/fairy/fairy/lib/fairy/share/base-app.rb:94
c:0014 p:---- s:0045 b:0045 l:000044 d:000044 FINISH
c:0013 p:---- s:0043 b:0043 l:000042 d:000042 CFUNC  :each_object
c:0012 p:0022 s:0039 b:0039 l:000031 d:000038 BLOCK  /var/projects/fairy/fairy/lib/fairy/share/base-app.rb:92
c:0011 p:---- s:0037 b:0037 l:000036 d:000036 FINISH
c:0010 p:---- s:0035 b:0035 l:000034 d:000034 CFUNC  :fork
c:0009 p:0035 s:0032 b:0032 l:000031 d:000031 METHOD /var/projects/fairy/fairy/lib/fairy/share/base-app.rb:91
c:0008 p:0016 s:0027 b:0027 l:000026 d:000026 METHOD /var/projects/fairy/fairy/lib/fairy/share/base-app.rb:18
c:0007 p:0080 s:0022 b:0022 l:000015 d:000021 BLOCK  /var/projects/fairy/fairy/lib/fairy/master.rb:112
c:0006 p:0019 s:0019 b:0019 l:000018 d:000018 METHOD <internal:prelude>:8
c:0005 p:0012 s:0016 b:0016 l:000015 d:000015 METHOD /var/projects/fairy/fairy/lib/fairy/master.rb:110
c:0004 p:0145 s:0013 b:0013 l:000012 d:000012 METHOD /var/projects/fairy/lib/deep-connect/evaluator.rb:32
c:0003 p:0064 s:0006 b:0006 l:0023fc d:000005 BLOCK  /var/projects/fairy/lib/deep-connect/session.rb:155
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:---- s:0002 b:0002 l:000001 d:000001 CONT#0 controller.rb[186] Controller[0]#block (2 levels) in terminate: TERMINATE: #2.5.3
CONT#0 controller.rb[191] Controller[0]#block (2 levels) in terminate: TERMINATE: #2.6
CONT#0 controller.rb[166] Controller[0]#block (2 levels) in terminate: TERMINATE: #2.3
CONT#0 controller.rb[168] Controller[0]#block (2 levels) in terminate: TERMINATE: #2.4
TOP   
---------------------------
-- Ruby level backtrace information-----------------------------------------
/var/projects/fairy/fairy/lib/fairy/share/base-app.rb:94:in `block (2 levels) in start_subcommand'
/var/projects/fairy/fairy/lib/fairy/share/base-app.rb:92:in `each_object'
/var/projects/fairy/fairy/lib/fairy/share/base-app.rb:92:in `block in start_subcommand'
/var/projects/fairy/fairy/lib/fairy/share/base-app.rb:91:in `fork'
/var/projects/fairy/fairy/lib/fairy/share/base-app.rb:91:in `start_subcommand'
/var/projects/fairy/fairy/lib/fairy/share/base-app.rb:18:in `start_subcommand'
/var/projects/fairy/fairy/lib/fairy/master.rb:112:in `block in assgin_controller'
<internal:prelude>:8:in `synchronize'
[M] master.rb[80] Master#when_disconnected: MASTER: disconnected: Start terminationcts/fairy/lib/deep-connect/evaluator.rb:32:in `evaluate_request'
/var/projects/fairy/lib/deep-connect/session.rb:155:in `block in receive'

-- C level backtrace information -------------------------------------------
0x8157b71 fairy master (rb_vm_bugreport+0xa1) [0x8157b71]
0x8193156 fairy master  [0x8193156]
0x8193208 fairy master (rb_bug+0x28) [0x8193208]
0x814311d fairy master  [0x814311d]
0x8064e9e fairy master  [0x8064e9e]
0x8065339 fairy master (rb_gc_finalize_deferred+0x59) [0x8065339]
0x815c2ad fairy master  [0x815c2ad]
0x8155fe9 fairy master  [0x8155fe9]
0x8148ddb fairy master  [0x8148ddb]
0x814f644 fairy master  [0x814f644]
0x8150a7f fairy master (rb_yield+0x4f) [0x8150a7f]
0x80682e6 fairy master  [0x80682e6]
0x8143f7d fairy master  [0x8143f7d]
0x81440a4 fairy master  [0x81440a4]
0x8155f54 fairy master  [0x8155f54]
0x8148ddb fairy master  [0x8148ddb]



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