Help localizing IIS crach running isapi

We are suddenly experience major problems on all of our four productionservers.

We are running four IIS 6 servers on Win 2003 Server which are connected with isapi_redirect (ajp13) to four tomcat 5.5.12 which is mapped 1 to 1.

They have been runnning fine in at least some month and suddenly the IIS application pools is crashing for us and we have no idea why, tomcat is running fine and we cant se any problems.

The is a typical event from one of the iis server event log:

----8<----

Event Type: Error
Event Source: Application Error
Event Category: (100)
Event ID: 1000
Date:  2007-02-07
Time:  19:48:02
User:  N/A
Computer: SE05WWW02
Description:
Faulting application w3wp.exe, version 6.0.3790.1830, faulting module ntdll.dll, version 5.2.3790.1830, fault address 0x0002f583.

----8<----

We have run DebugDiag and this is a snippet from that, below, and the only clue we can find is that the following:

isapi_redirect!TerminateFilter+89af	01027884	00000000	6a6b8266
isapi_redirect+8406	00000048	010278a0	0000000a

To me it looks like the method TerminateFilter in isapi_redirect is in someway crashing... And we have looked in the tomcatlogs, iis logs, event logs and can't se why this is happening.

---8<---

Type of Analysis Performed	Crash Analysis
Machine Name	SE05WWW02
Operating System	Windows Server 2003 Service Pack 1
Number Of Processors	4
Process ID	9152
Process Image	c:\WINDOWS\system32\inetsrv\w3wp.exe
System Up-Time	04:07:33
Process Up-Time	02:23:09

Thread 5 - System ID 9188

Entry point	w3tp!THREAD_MANAGER::ThreadManagerThread
Create time	2007-02-04 19:11:05
Time spent in user mode	0 Days 0:0:0.468
Time spent in kernel mode	0 Days 0:0:0.421

Function	Arg 1	Arg 2	Arg 3
ntdll!RtlpCoalesceFreeBlocks+36e	01091018	01741028	00d8ec68
ntdll!RtlFreeHeap+38e	00260000	00000000	0108f010
msvcrt!free+c3	0108f010	01027780	00000000
isapi_redirect!TerminateFilter+89af	01027884	00000000	6a6b8266
isapi_redirect+8406	00000048	010278a0	0000000a

---8<---

Any input is most welcome, we have no idea where to look or where to search for an error. So any suggestions is of great help...

I attach the full debugdiag result.

Regards Per Jonsson

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Help localizing IIS crach running isapi_redirect.dll

Per Johnsson

2007-02-08

Thread 5 - System ID 9188