Last modified: 2013-09-04 10:36:16 UTC

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Bug 30094 - Bug in PHP 5.4alphas causes segfault on every page load
Bug in PHP 5.4alphas causes segfault on every page load
Status: RESOLVED FIXED
Product: MediaWiki
Classification: Unclassified
Parser (Other open bugs)
1.17.x
All All
: Unprioritized normal (vote)
: ---
Assigned To: Nobody - You can work on this!
https://bugs.php.net/bug.php?id=55305
: newphp, upstream
: 30093 (view as bug list)
Depends on:
Blocks: 30092
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Reported: 2011-07-27 23:45 UTC by Ryan Biesemeyer
Modified: 2013-09-04 10:36 UTC (History)
1 user (show)

See Also:
Web browser: ---
Mobile Platform: ---
Assignee Huggle Beta Tester: ---

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Description Ryan Biesemeyer 2011-07-27 23:45:37 UTC 
Bug documented here: 
https://bugs.php.net/bug.php?id=55305

When a variable that was instantiated in the class definition gets a second reference as an instance variable, it must be pre-instantiated. Results in segfault and sudden memory allocations of 1.5+GB in size.

includes/parser/Preprocessor_DOM.php:684 class PDDStack is guilty of this.

Workarounds:
  - Instantiate the second named variable before you make it a reference. `$this->accum = nil;` is enough
  - Instantiate the second named variable in the class definition
  - Instantiate neither in the class definion

I'm not sure where else this is likely to crop up.
Comment 1 Sam Reed (reedy) 2011-07-27 23:51:11 UTC 
*** Bug 30093 has been marked as a duplicate of this bug. ***
Comment 2 Ryan Biesemeyer 2011-08-04 17:18:46 UTC 
Update: The PHP guys have patched 5.4 and closed the associated bug in r314054, so the current snapshots/builds should not be exhibiting these symptoms.

https://bugs.php.net/bug.php?id=55305
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