From: Eric Wong <normalperson@...>
Date: 2011-04-06T07:42:03+09:00
Subject: [ruby-core:35620] [Ruby 1.9 - Bug #4266] Timeouts in threads cause "ThreadError: deadlock; recursive locking"


Issue #4266 has been updated by Eric Wong.


I have a short-term fix for the related issue in Bug #4289
http://redmine.ruby-lang.org/attachments/1572/0001-timeout.rb-avoid-introducing-new-class-for-every-tim.patch

It works both with and without the mutex-synchronize-use-c-implementation.patch
posted here.

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Bug #4266: Timeouts in threads cause "ThreadError: deadlock; recursive locking"
http://redmine.ruby-lang.org/issues/4266

Author: Christopher Bottaro
Status: Assigned
Priority: High
Assignee: Koichi Sasada
Category: core
Target version: 1.9.2
ruby -v: ruby 1.9.2p136 (2010-12-25 revision 30365) [x86_64-darwin10.6.0]


 Run the attached file (or this pastie http://pastie.org/1448542) a few times and you'll eventually get:
 
 ThreadError: deadlock; recursive locking:
 <internal:prelude>:8:in `lock'
 <internal:prelude>:8:in `synchronize'
 bin/deadlock_test.rb:86:in `block (4 levels) in <main>'
 /Users/cjbottaro/.rvm/rubies/ruby-1.9.2-p136/lib/ruby/1.9.1/timeout.rb:57:in `timeout'
 bin/deadlock_test.rb:85:in `block (3 levels) in <main>'
 bin/deadlock_test.rb:83:in `times'
 bin/deadlock_test.rb:83:in `block (2 levels) in <main>'
 
 I've had the script run successfully over 5 times in a row before getting the errors, so if it doesn't happen the first few times... keep trying.
 
 The problem doesn't happen in 1.8.7 or Jruby, but does happen in 1.9.1.


-- 
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