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From Nick Gearls <>
Subject Huge memory leak in mod_substitute
Date Fri, 07 Jan 2011 13:26:35 GMT

I saw servers completely freezing (the whole system, not only httpd) due 
to a memory leak problem in mod_substitute.
This is a major issue as it can completely block your systems, sometimes 
even the fail-over as the server is blocked, but not completely down. 
Even the management interfaces are blocked.
We reported the problem 
(, with a 
(scaled-down) reproducible process to trigger it.

Did somebody already begin to work on mod_substitute memory management?



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