Faulting application w3wp.exe : faulting module mscorwks.dll

We have been getting frequent W3SVC crashes on our IIS web servers. At some
points IIS will get completely turned off till we manually restart.

There is some internal discussions of potential code not handling
exceptions, but this gets answered with: Your observation is correct that not
handling exception from ASMX leads to unhandled exception. However, that
applies to ASP.NET 2.0 Web service handler. The AJAX handler handles the
exception itself, and then produces a custom HTTP 500 response. etc...

The predominate error message is this:

Faulting application w3wp.exe, version 6.0.3790.3959, faulting module
mscorwks.dll, version 2.0.50727.832, fault address 0x000000000020b22c

Event Type: Error
Event Source: Application Error
Event Category: (100)
Event ID: 1000
Date: 10/8/2007
Time: 12:55:01 PM
User: N/A

Description:
Faulting application w3wp.exe, version 6.0.3790.3959, faulting module
mscorwks.dll, version 2.0.50727.832, fault address 0x000000000020b22c.

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 41 70 70 6c 69 63 61 74 Applicat
0008: 69 6f 6e 20 46 61 69 6c ion Fail
0010: 75 72 65 20 20 77 33 77 ure w3w
0018: 70 2e 65 78 65 20 36 2e p.exe 6.
0020: 30 2e 33 37 39 30 2e 33 0.3790.3
0028: 39 35 39 20 69 6e 20 6d 959 in m
0030: 73 63 6f 72 77 6b 73 2e scorwks.
0038: 64 6c 6c 20 32 2e 30 2e dll 2.0.
0040: 35 30 37 32 37 2e 38 33 50727.83
0048: 32 20 61 74 20 6f 66 66 2 at off
0050: 73 65 74 20 30 30 30 30 set 0000
0058: 30 30 30 30 30 30 32 30 00000020
0060: 62 32 32 63 b22c

Event Source: W3SVC
Event Category: None
Event ID: 1011
Date: 10/8/2007
Time: 7:37:47 AM
User: N/A

Description:
A process serving application pool '.NET 2.0' suffered a fatal communication
error with the World Wide Web Publishing Service. The process id was '1932'.
The data field contains the error number.