Bug #4289: Timeouts in threads cause SEGV
http://redmine.ruby-lang.org/issues/show/4289

Author: Motohiro KOSAKI
Status: Assigned, Priority: Normal
Assigned to: Akira Tanaka, Category: core, Target version: 1.9.3
ruby -v: ruby 1.9.3dev (2011-01-18 trunk 30591) [x86_64-linux]

Derived from [Bug#4266]

Running deadlock_test.rb in [Bug#4266] on trunk makes segfault. git bisect indicate
first bad commit is below.

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commit d295957957c828588a8ca3c7b8619c7a93be6b5c
Author: akr <akr / b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date:   Tue Nov 2 22:37:08 2010 +0000

    * vm_method.c (rb_clear_cache_by_class): just return if the class has
      no method.  reported by Eric Wong.  [ruby-core:32689]


    git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@29673 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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Plus, I've confirmed latest trunk + revert d2959579 doesn't makes segfault.


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