https://bugzilla.wikimedia.org/show_bug.cgi?id=49244
Web browser: ---
Bug ID: 49244
Summary: Infinite loops/excessive execution time in
DairikiDiff.php
Product: MediaWiki
Version: 1.21.1
Hardware: All
OS: Linux
Status: UNCONFIRMED
Severity: major
Priority: Unprioritized
Component: History/Diffs
Assignee: [email protected]
Reporter: [email protected]
Classification: Unclassified
Mobile Platform: ---
Encountered an issue where MediaWiki exhaust allowed execution time in certain
functions in DairikiDiff.php on a certain fairly large article (~130KB) with a
large table. Triggers at various points in the code, but primarily in
_DiffEngine::_diag
[Thu Jun 06 00:43:42 2013] [error] [client 127.0.0.1] PHP Fatal error: Maximum
execution time of 30 seconds exceeded in [...]/includes/diff/DairikiDiff.php on
line 1286
[Thu Jun 06 00:43:56 2013] [error] [client 127.0.0.1] PHP Fatal error: Maximum
execution time of 30 seconds exceeded in [...]/includes/diff/DairikiDiff.php on
line 1285
[Thu Jun 06 05:14:31 2013] [error] [client 127.0.0.1] PHP Fatal error: Maximum
execution time of 30 seconds exceeded in [...]/includes/diff/DairikiDiff.php on
line 402
[Thu Jun 06 05:16:02 2013] [error] [client 127.0.0.1] PHP Fatal error: Maximum
execution time of 30 seconds exceeded in
[...]/includes/diff/DairikiDiff.php(399) : assert code on line 1
[Thu Jun 06 05:16:18 2013] [error] [client 127.0.0.1] PHP Fatal error: Maximum
execution time of 30 seconds exceeded in
[...]/includes/diff/DairikiDiff.php(399) : assert code on line 1
[Thu Jun 06 05:17:29 2013] [error] [client 127.0.0.1] PHP Fatal error: Maximum
execution time of 30 seconds exceeded in [...]/includes/diff/DairikiDiff.php on
line 399
[Thu Jun 06 05:17:44 2013] [error] [client 127.0.0.1] PHP Fatal error: Maximum
execution time of 30 seconds exceeded in [...]/includes/diff/DairikiDiff.php on
line 397
[Thu Jun 06 05:19:16 2013] [error] [client 127.0.0.1] PHP Fatal error: Maximum
execution time of 30 seconds exceeded in [...]/includes/diff/DairikiDiff.php on
line 399
[Thu Jun 06 05:26:13 2013] [error] [client 127.0.0.1] PHP Fatal error: Maximum
execution time of 30 seconds exceeded in
[...]/includes/diff/DairikiDiff.php(399) : assert code on line 1
[Thu Jun 06 05:26:57 2013] [error] [client 127.0.0.1] PHP Fatal error: Maximum
execution time of 30 seconds exceeded in [...]/includes/diff/DairikiDiff.php on
line 399
[Thu Jun 06 05:27:16 2013] [error] [client 127.0.0.1] PHP Fatal error: Maximum
execution time of 30 seconds exceeded in [...]/includes/diff/DairikiDiff.php on
line 398
[Thu Jun 06 05:27:21 2013] [error] [client 127.0.0.1] PHP Fatal error: Maximum
execution time of 30 seconds exceeded in [...]/includes/diff/DairikiDiff.php on
line 397
[Thu Jun 06 05:35:09 2013] [error] [client 127.0.0.1] PHP Fatal error: Maximum
execution time of 30 seconds exceeded in [...]/includes/diff/DairikiDiff.php on
line 402
Dumped the local and class variable space in _DiffEngine::_diag on line 375,
right before entering the for-loop. It's found in the attached file.
Presumably this is not intended behavior on encountering a large diff? The
edits themselves are fairly minor, and it doesn't have any issues on different,
much larger (400KB) table.
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