Out of memory errors in ob_sessrewrite

[MrManager]

I occasionally see these PHP errors in my log files:

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PHP Fatal error:  Allowed memory size of 134217728 bytes exhausted (tried to allocate 66030621 bytes) in /xxx/Sources/QueryString.php on line 481

They get triggered by this line in the ob_sessrewrite function in Sources/QueryString.php:

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$buffer = preg_replace_callback('~"' . preg_quote($scripturl, '/') . '\?(?:' . SID . '(?:;|&|&))((?:board|topic)=[^#"]+?)(#[^"]*?)?"~', 'sid_insert__preg_callback', $buffer);

Any ideas what this is and how I could prevent it from happening?

[margarett]

SMF won't use 128Mb... Which version are you running? (2.0.7 had in fact some issues with excessive memory consumption)

[MrManager]

I'm running 2.0.9

[margarett]

So in this case I see no possibility of it being an issue with SMF itself...

So, MODs in use?