ISAPI_Rewrite race condition

[brandonmurphy Profile]

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?

Thanks
Brandon

[Anton]

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.