From: Tanaka Akira <akr@...>
Date: 2009-11-19T02:11:16+09:00
Subject: [ruby-core:26815] Re: [Bug #1525](Closed) Deadlock in Ruby 1.9's VM caused by ConditionVariable.wait and fork?

In article <87einw55ej.fsf@fsij.org>,
  Tanaka Akira <akr@fsij.org> writes:

> After this commit, test-all causes SEGV on FreeBSD 6.4.

Simplified test case:

% ./ruby -e 'fork { puts }'
-e:1: [BUG] native_mutex_unlock return non-zero: 1
ruby 1.9.2dev (2009-11-19 trunk 25848) [x86_64-freebsd6.4]

-- control frame ----------
c:0009 p:---- s:0020 b:0020 l:000019 d:000019 CFUNC  :write
c:0008 p:---- s:0018 b:0018 l:000017 d:000017 CFUNC  :puts
c:0007 p:---- s:0016 b:0016 l:000015 d:000015 CFUNC  :puts
c:0006 p:0009 s:0013 b:0013 l:001038 d:000012 BLOCK  -e:1
c:0005 p:---- s:0011 b:0011 l:000010 d:000010 FINISH
c:0004 p:---- s:0009 b:0009 l:000008 d:000008 CFUNC  :fork
c:0003 p:0009 s:0006 b:0006 l:001038 d:001268 EVAL   -e:1
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:0000 s:0002 b:0002 l:001038 d:001038 TOP   
---------------------------
-e:1:in `<main>'
-e:1:in `fork'
-e:1:in `block in <main>'
-e:1:in `puts'
-e:1:in `puts'
-e:1:in `write'

[NOTE]
You may have encountered a bug in the Ruby interpreter or extension libraries.
Bug reports are welcome.
For details: http://www.ruby-lang.org/bugreport.html
-- 
Tanaka Akira