[ruby-core:39197] [Backport87 - Bug #3100] Lockup in child after fork

Issue #3100 has been updated by Vit Ondruch.

File strace.log added

May I ask what is the state of this issue? The reproducer was recently mentioned as an issue in upcoming RHEL 6.2 [1] and it lockups on my Fedora with ruby 1.8.7 (2011-06-30 patchlevel 352) [x86_64-linux]. I am 


[1] https://bugzilla.redhat.com/show_bug.cgi?id=734180
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Bug #3100: Lockup in child after fork
http://redmine.ruby-lang.org/issues/3100

Author: Aliaksey Kandratsenka
Status: Open
Priority: Normal
Assignee: 
Category: core
Target version: 
ruby -v: ruby 1.8.7 (2010-01-10 patchlevel 249) [i486-linux]


=begin
 I was using PTY.spawn and found a bug. I'm attaching a small testcase that at least on 2 my machines gives quite probable ruby process lockup in child.
 
 I'm also attaching gdb backtrace of locked up child. It can be seen that we're stuck in NTPL's low-level lock that protects timer thread condition variable. So it looks like I'm doing fork at 'right' time, when this condition is being signaled in parent.
 
 P.S. I'm categorizing it as core even though I can reproduce this only via PTY.spawn, 'cause pty.c looks very much innocent.
=end



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