ISAPI_Rewrite race condition

ISAPI_Rewrite is a powerful URL manipulation engine based on regular expressions
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Joined: 05 Apr 2014, 04:28

ISAPI_Rewrite race condition

05 Apr 2014, 04:33

Our client has the Helicon ISAPI_Rewrite module installed, and has been noticing a runaway CPU issue where over a period of time the CPU becomes pegged at 100%.

We've done an IIS memory dump and discovered a number of hanging threads "ISAPI_Rewrite" on module "Entering critical section". Is it possible that there is a race condition issue in the code? What would cause this race condition e.g. number of rules in .htaccess (they have a large number), publishing of the .htaccess file (they do this every night, or something else?


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Posts: 871
Joined: 12 Mar 2012, 09:54

Re: ISAPI_Rewrite race condition

07 Apr 2014, 07:10

Hello, Brandon

First, please indicate what build of ISAPI_Rewrite they are using and clarify if it's v2 or v3.
As you talk about .htaccess files I believe it's version 3 although you put a question in ISAPI_Rewrite 2 forum.

Also, please send the configs and all relevant logs to [email protected] for investigation.
And specify what Windows version is used.

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