w3wp.exe crash - ThreadAbortException

we have a problem that we can't reproduce, it happens randomly on our web server (Windows Server 2008 Datacenter 64-bit, hosted on Amazon EC2) running ASP.NET 4.

It starts with a ASP.NET warning in the error log (a strange GET request with a really long URL):

Exception information:

Exception type: HttpException

Exception message: The length of the URL for this request exceeds the configured maxUrlLength value.

at System.Web.HttpRequest.ValidateInputIfRequiredByConfig()

at System.Web.HttpApplication.PipelineStepManager.ValidateHelper(HttpContext context)

Then an error:

Application ID: /LM/W3SVC/2/ROOT

Process ID: 4604

Exception: System.Threading.ThreadAbortException

Message: Thread was being aborted.

StackTrace: at System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context)

at System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(IntPtr managedHttpContext, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags)

at System.Web.H开发者_如何学Pythonosting.PipelineRuntime.ProcessRequestNotification(IntPtr managedHttpContext, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags)

Then another error:

Application ID: DefaultDomain

Process ID: 4604

Exception: System.Threading.ThreadAbortException

Message: Thread was being aborted.

StackTrace:

And then the application error:

Faulting application w3wp.exe, version 7.0.6002.18005, time stamp 0x49e03238, faulting module kernel32.dll, version 6.0.6002.18005, time stamp 0x49e041d1, exception code 0xe0434352, fault offset 0x00000000000176fd, process id 0x%9, application start time 0x%10.

Windbg

I managed to get a dump for a crash with adplus, but I really don't know what to look for. I've troubleshooted some stackoverflows with Windbg before, but I don't know which approach to use for this error.

!pe on the thread with the error:

Exception object: 00000001c323d948

Exception type: System.Threading.ThreadAbortException

Message: Thread was being aborted.

InnerException:

StackTrace (generated):

StackTraceString:

HResult: 80131530

!clrstack

Child SP IP Call Site

0000000015f7f078 0000000076c176fd [GCFrame: 0000000015f7f078]

0000000015f7f258 0000000076c176fd [GCFrame: 0000000015f7f258]

k

Child-SP RetAddr Call Site

0000000015f7edf0 000007fef2826e39 kernel32!RaiseException+0x39

0000000015f7eec0 000007fef2bbbfb4 clr!RaiseTheExceptionInternalOnly+0x363

0000000015f7eff0 000007fef2bbc906 clr!RaiseTheException+0xa4

0000000015f7f020 000007fef2c3b99b clr!BStrFromString+0x66

0000000015f7f050 000007fef2c3b9a9 clr!RealCOMPlusThrow+0x3b

0000000015f7f0c0 000007fef2c93156 clr!RealCOMPlusThrow+0x9

0000000015f7f0f0 000007fef2b229f3 clr!Thread::RaiseCrossContextException+0x2a7

0000000015f7f310 000007fef2830886 clr! ?? ::FNODOBFM::string'+0xafb03

0000000015f7f4c0 000007fef27fcce3 clr!UM2MDoADCallBack+0x9e

0000000015f7f530 000007fef845ba59 clr!UMThunkStubAMD64+0x273

0000000015f7f5c0 000007fef8458f02 webengine4!W3_MGD_HANDLER::ProcessNotification+0x79

0000000015f7f5f0 000007fef27d4595 webengine4!ProcessNotificationCallback+0x43

0000000015f7f620 000007fef27d3ac8 clr!UnManagedPerAppDomainTPCount::DispatchWorkItem+0x181

0000000015f7f6d0 000007fef294658f clr!ThreadpoolMgr::NewWorkerThreadStart+0x2e5

0000000015f7f770 000007fef29447c6 clr!ThreadpoolMgr::WorkerThreadStart+0x3b

0000000015f7f810 0000000076c1be3d clr!Thread::intermediateThreadProc+0x7d

0000000015f7fbd0 0000000076d56a51 kernel32!BaseThreadInitThunk+0xd

0000000015f7fc00 00000000`00000000 ntdll!RtlUserThreadStart+0x1d

Anybody have a clue what this could be? Or can point me in the right direction for analyzing it with Windbg?

Edit: The incoming urls usually looks like this: foo.bar.com/wEPDwULLTE1MTk5MzIzMTFkGAMFFmN0bDAwJGRiMSRkZGxEYXRhYmFzZXMPFCsAAmRkZAU7Y3RsMDAkU2VhcmNoQ2xvdWQxJF9SaWdodENvbHVtbiRfU2VhcmNoQ2xvdWQkbHN2U2VhcmNoVGVybXMPFCsADmRkZGRkZGQ8KwAUAAIUZGRkZgL/D2QFK2N0bDAwJHN1cnZleTEkX1JpZ2h0Q29sdW1uJF9JUiR1c2VyQ29tbWVudHMPFCsAA2VnZGQeuUcvQDsShDIp1k7YjJw70Ry 9/Q1B9Sd1egrovYgkw==/

but I found in the event log that this happen for this urls like this aswell: foo.bar.com/& ("dangerous request" in .NET 4)

You should at least load symbols and then see the correct strings displayed in call stack.

If you are not capable of handling such analysis, I think opening a support case via http://support.microsoft.com is good for you.

I have been trying to work out a similar issue.

I found this article which purports a process for determining the cause, I think it actually makes sense:

http://blogs.msdn.com/b/asiatech/archive/2012/06/21/how-to-troubleshoot-httpexception-request-timed-out-asp-net-4-0-64-bit.aspx

Caveat: I have not been able to sucessfully complete the steps described. I will be posting here asking for help.