https://bugzilla.wikimedia.org/show_bug.cgi?id=37539
Web browser: ---
Bug #: 37539
Summary: Image thumbnailing on WAMP sometimes locks up
Product: MediaWiki
Version: unspecified
Platform: All
OS/Version: All
Status: UNCONFIRMED
Severity: normal
Priority: Unprioritized
Component: General/Unknown
AssignedTo: [email protected]
ReportedBy: [email protected]
Classification: Unclassified
Mobile Platform: ---
We run a fairly large corporate Wiki (150k+ users) using mediaWiki v1.17, PHP
5.2.6 on a WAMP stack. We notice that sometimes jobs that are executed on the
command line (using the PHP passthru command) get stuck. These jobs include:
- Image thumbnailing (ImageMagick)
- PDF generating (using an extension and external PDF generator)
- Math conversion (LaTex)
The cause and symptoms are as follows:
- 2 command line jobs are requested at more or less the same time
- One of the jobs hangs: Taskmanager will show 'cmd'and 'convert' jobs that
never finish, and one of Apache's worker threads will remain in W state.
- More jobs get requested and will get stuck as well, to the point where all
Apache worker threads are locked.
I can reliably reproduce this issue in our test environment.
The bug appears to be caused by a known PHP issue:
https://bugs.php.net/bug.php?id=44942
A workaround for this bug has been tested: we have modified
includes/GlobalFuncitons.php with the suggested fix, that is: call
session_write_close() before calling passthru(), and calling session_start()
afterwards.
Given that this is a (long-standing) PHP bug, is this something that should be
fixed in the MediaWiki core code? At this time, it appears to be our only
option.
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