[ruby-core:42305] [Backport87 - Backport #4339] Segmentation fault during Marshal.load

Issue #4339 has been updated by Jim Meyering.


Hello,
I encountered this bug on RHEL-6's ruby-1.8.7.299 and with .352 and
reported it against RHEL-6 via http://bugzilla.redhat.com/781561
Applying the patch,
  http://bugs.ruby-lang.org/attachments/2243/ruby-1.8.7-marshal.patch
solved our problem nicely.  Please consider it for upstream ruby 1.8.7.

The reproducer, http://bugs.ruby-lang.org/attachments/1446/REPRO4.rb
also triggers a segmentation fault with Fedora 16's ruby:

    $ ruby /t/REPRO4.rb
    /t/REPRO4.rb:35: [BUG] Segmentation fault
    ruby 1.8.7 (2011-12-28 patchlevel 357) [x86_64-linux]

    zsh: abort (core dumped)  ruby /t/REPRO4.rb

----------------------------------------
Backport #4339: Segmentation fault during Marshal.load
https://bugs.ruby-lang.org/issues/4339

Author: Sean Bradly
Status: Feedback
Priority: Normal
Assignee: Shyouhei Urabe
Category: core
Target version: 


=begin
 Conditions that seem to have to be satisfied:
 
 1) A call to Marshal.load must be interrupted by a context switch.
 2) Another thread calls GC.start manually.
 3) The object being marshaled needs to have a lot of child objects to be reliable.
 
 This appears to be a thread-safety issue affecting Ruby 1.8.x only. It triggers reliably for me on:
 
 Ubuntu     -> ruby 1.8.7 (2010-06-23 patchlevel 299) [i686-linux]
 Ubuntu-rvm -> ruby 1.8.7 (2010-12-23 patchlevel 330) [i686-linux]
 MacRuby    -> ruby 1.8.7 (2009-06-12 patchlevel 174) [universal-darwin10.0]
 Mac-rvm    -> ruby 1.8.7 (2010-08-16 patchlevel 302) [i686-darwin10.4.0]
=end



-- 
http://bugs.ruby-lang.org/