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POw3wp.exe crash - ThreadAbortException
 

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    <p>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.</p> <p><strong>It starts with a ASP.NET warning in the error log (a strange GET request with a really long URL):</strong></p> <blockquote> <p>Exception information:<br> Exception type: HttpException<br> Exception message: The length of the URL for this request exceeds the configured maxUrlLength value.<br> at System.Web.HttpRequest.ValidateInputIfRequiredByConfig()<br> at System.Web.HttpApplication.PipelineStepManager.ValidateHelper(HttpContext context) </p> </blockquote> <p><strong>Then an error:</strong></p> <blockquote> <p>Application ID: /LM/W3SVC/2/ROOT<br> Process ID: 4604<br> Exception: System.Threading.ThreadAbortException<br> Message: Thread was being aborted.<br> StackTrace: at System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context)<br> at System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(IntPtr managedHttpContext, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags)<br> at System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(IntPtr managedHttpContext, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags) </p> </blockquote> <p><strong>Then another error:</strong></p> <blockquote> <p>Application ID: DefaultDomain<br> Process ID: 4604<br> Exception: System.Threading.ThreadAbortException<br> Message: Thread was being aborted.<br> StackTrace: </p> </blockquote> <p><strong>And then the application error:</strong></p> <blockquote> <p>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. </p> </blockquote> <p><strong>Windbg</strong></p> <p>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.</p> <p><strong>!pe on the thread with the error:</strong> </p> <blockquote> <p>Exception object: 00000001c323d948<br> Exception type: System.Threading.ThreadAbortException<br> Message: Thread was being aborted.<br> InnerException: <br> StackTrace (generated):<br> <br> StackTraceString: <br> HResult: 80131530 </p> </blockquote> <p><strong>!clrstack</strong></p> <blockquote> <p>Child SP IP Call Site<br> 0000000015f7f078 0000000076c176fd [GCFrame: 0000000015f7f078]<br> 0000000015f7f258 0000000076c176fd [GCFrame: 0000000015f7f258] </p> </blockquote> <p><strong>k</strong></p> <blockquote> <p>Child-SP RetAddr Call Site<br> 00000000<code>15f7edf0 000007fe</code>f2826e39 kernel32!RaiseException+0x39<br> 00000000<code>15f7eec0 000007fe</code>f2bbbfb4 clr!RaiseTheExceptionInternalOnly+0x363<br> 00000000<code>15f7eff0 000007fe</code>f2bbc906 clr!RaiseTheException+0xa4<br> 00000000<code>15f7f020 000007fe</code>f2c3b99b clr!BStrFromString+0x66<br> 00000000<code>15f7f050 000007fe</code>f2c3b9a9 clr!RealCOMPlusThrow+0x3b<br> 00000000<code>15f7f0c0 000007fe</code>f2c93156 clr!RealCOMPlusThrow+0x9<br> 00000000<code>15f7f0f0 000007fe</code>f2b229f3 clr!Thread::RaiseCrossContextException+0x2a7<br> 00000000<code>15f7f310 000007fe</code>f2830886 clr! ?? ::FNODOBFM::<code>string'+0xafb03<br> 00000000</code>15f7f4c0 000007fe<code>f27fcce3 clr!UM2MDoADCallBack+0x9e<br> 00000000</code>15f7f530 000007fe<code>f845ba59 clr!UMThunkStubAMD64+0x273<br> 00000000</code>15f7f5c0 000007fe<code>f8458f02 webengine4!W3_MGD_HANDLER::ProcessNotification+0x79<br> 00000000</code>15f7f5f0 000007fe<code>f27d4595 webengine4!ProcessNotificationCallback+0x43<br> 00000000</code>15f7f620 000007fe<code>f27d3ac8 clr!UnManagedPerAppDomainTPCount::DispatchWorkItem+0x181<br> 00000000</code>15f7f6d0 000007fe<code>f294658f clr!ThreadpoolMgr::NewWorkerThreadStart+0x2e5<br> 00000000</code>15f7f770 000007fe<code>f29447c6 clr!ThreadpoolMgr::WorkerThreadStart+0x3b<br> 00000000</code>15f7f810 00000000<code>76c1be3d clr!Thread::intermediateThreadProc+0x7d<br> 00000000</code>15f7fbd0 00000000<code>76d56a51 kernel32!BaseThreadInitThunk+0xd<br> 00000000</code>15f7fc00 00000000`00000000 ntdll!RtlUserThreadStart+0x1d </p> </blockquote> <p>Anybody have a clue what this could be? Or can point me in the right direction for analyzing it with Windbg?</p> <p>Edit: The incoming urls usually looks like this: foo.bar.com/wEPDwULLTE1MTk5MzIzMTFkGAMFFmN0bDAwJGRiMSRkZGxEYXRhYmFzZXMPFCsAAmRkZAU7Y3RsMDAkU2VhcmNoQ2xvdWQxJF9SaWdodENvbHVtbiRfU2VhcmNoQ2xvdWQkbHN2U2VhcmNoVGVybXMPFCsADmRkZGRkZGQ8KwAUAAIUZGRkZgL/D2QFK2N0bDAwJHN1cnZleTEkX1JpZ2h0Q29sdW1uJF9JUiR1c2VyQ29tbWVudHMPFCsAA2VnZGQeuUcvQDsShDIp1k7YjJw70Ry 9/Q1B9Sd1egrovYgkw==/</p> <p>but I found in the event log that this happen for this urls like this aswell: foo.bar.com/&amp; ("dangerous request" in .NET 4)</p>
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