From: Tanaka Akira <akr@...>
Date: 2009-11-25T16:57:29+09:00
Subject: [ruby-core:26904] Re: [Bug #1525](Closed) Deadlock in Ruby 1.9's VM caused by ConditionVariable.wait and fork?

In article <4B07C4C5.8060102@plan99.net>,
  Hongli Lai <hongli@plan99.net> writes:

>> % ./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]
>
> This is what I get on FreeBSD 7.1-RELEASE:

FreeBSD 8.0-RELEASE behaves similar to FreeBSD 6.4.

% uname -mrsv
FreeBSD 8.0-RELEASE FreeBSD 8.0-RELEASE #0: Sat Nov 21 15:48:17 UTC 2009     root@almeida.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386
% ./ruby -e 'fork { puts }'
-e:1: [BUG] pthread_mutex_unlock: Operation not permitted (EPERM)
ruby 1.9.2dev (2009-11-25 trunk 25911) [i386-freebsd8.0]

-- 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:0010a4 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:0010a4 d:000004 EVAL   -e:1
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:0000 s:0002 b:0002 l:0010a4 d:0010a4 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