php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login

go to bug id or search bugs for

Bug #74714 serialize() crashes with multiple threads / pthreads
Submitted: 2017-06-08 17:47 UTC Modified: -
From: benjamin dot roth at jaumo dot com Assigned:
Status: Open Package: Reproducible crash
PHP Version: 7.1.5 OS: Linux
Private report: No CVE-ID: None
View Add Comment Developer Edit
Welcome! If you don't have a Git account, you can't do anything here.
You can add a comment by following this link or if you reported this bug, you can edit this bug over here.
(description)
Block user comment
Status: Assign to:
Package:
Bug Type:
Summary:
From: benjamin dot roth at jaumo dot com
New email:
PHP Version: OS:

 

 [2017-06-08 17:47 UTC] benjamin dot roth at jaumo dot com 
Description:
------------
serialize() seems to be not thread safe. Scripts crash with SIGSEGV or SIGABORT on a regular basis if parallel threads do serialization with pthreads. Sometimes this happens at the end of the script on shutdown and sometimes in the middle of script execution. As it is a race condition there is no deterministic way to reproduce it but the attached script fails after some time in almost all cases.

Test script:
---------------
https://gist.github.com/brstgt/e04d08c237d84003103050dc7c371acd

Serialized file required as "entities.txt" in test script: https://cl.ly/2v3Y1o2S351Q

Run in loop until it segfaults or aborts. Normally between 1-30s

while true; do php scripts/segv.php || break; done



Expected result:
----------------
No SIGABORT or SIGSEGV

Actual result:
--------------
https://gist.github.com/brstgt/76e3e1135872e2ae1770ae4e59b66696

Patches

Add a Patch

Pull Requests

Add a Pull Request
 
PHP Copyright © 2001-2019 The PHP Group
All rights reserved. 		Last updated: Sat Nov 16 22:01:35 2019 UTC