Scott Hanselman

ThreadAbortException woes

September 09, 2005 Comment on this post [7] Posted in ASP.NET | DasBlog | Bugs
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Hey readers, I'm starting to get this exception ALL the time on my site, and my ISP is starting to complain. It's also affecting uptime:

 System.Threading.ThreadAbortException: Thread was being aborted. at newtelligence.DasBlog.Web.Core.TemplateProcessor.ProcessTemplate(SharedBasePage page, Entry entry, String templateString, Control contentPlaceHolder, Macros macros) in C:\dev\DasBlog CE\source\newtelligence.DasBlog.Web.Core\TemplateProcessor.cs:line 118 at newtelligence.DasBlog.Web.Core.TemplateProcessor.ProcessTemplate(SharedBasePage page, String templateString, Control contentPlaceHolder, Macros macros) in C:\dev\DasBlog CE\source\newtelligence.DasBlog.Web.Core\TemplateProcessor.cs:line 61 at newtelligence.DasBlog.Web.Core.SharedBasePage.ProcessDayTemplate(DateTime day, Control ContentPlaceHolder) in C:\dev\DasBlog CE\source\newtelligence.DasBlog.Web.Core\SharedBasePage.cs:line 743 at newtelligence.DasBlog.Web.Core.Macros.get_Bodytext() in C:\dev\DasBlog CE\source\newtelligence.DasBlog.Web.Core\Macros.cs:line 1231 --- End of inner exception stack trace --- at System.Reflection.RuntimeMethodInfo.InternalInvoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean isBinderDefault, Assembly caller, Boolean verifyAccess) at System.Reflection.RuntimeMethodInfo.InternalInvoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean verifyAccess) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at System.Reflection.RuntimePropertyInfo.GetValue(Object obj, Object[] index) at newtelligence.DasBlog.Web.Core.TemplateProcessor.InvokeMacro(Object obj, String expression) in C:\dev\DasBlog CE\source\newtelligence.DasBlog.Web.Core\TemplateProcessor.cs:line 332 at newtelligence.DasBlog.Web.Core.TemplateProcessor.ProcessTemplate(SharedBasePage page, Entry entry, String templateString, Control contentPlaceHolder, Macros macros) in C:\dev\DasBlog CE\source\newtelligence.DasBlog.Web.Core\TemplateProcessor.cs:line 105
while processing .

I don't think it's dasBlog or the macro engine because:

A. Nothing has changed in this code in months
2. Most of what DasBlog does is in the Template Processor - like 90% - so if a thread were to abort, chances are it'd be happening in the code that runs 90% of the time.

That said, my ISP says that the site isn't recycling - they are basing this on the pid of w3wp.exe not changing. When ASP.NET "recycles" a site are they starting the AppDomain over or the whole process? I thought it was the process. Either way, you'd expect me to get another Application_Start event, and I'm not seeing that. I'm just seeing these Thread Aborts without app recycles.

Any ideas as I debug this?

About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

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September 10, 2005 3:29
Are there any Response.Redirects in that code? I know those cause ThreadAbortExceptions.
September 10, 2005 3:50
I get the same error in one of my applications. It only happens at one client location. I cannot reproduce it, and the app uses the same framework that is in use in several other applications installed at many different clients without error. However, I do know that the ThreadAbortExceptions are occuring after a Response.Redirect(). I've got a base page that catches any otherwise unhandled exceptions using the Error event. So, I just threw a wrapper around my logging/e-mail notifications that looks like this: Exception ex = Server.GetLastError().GetBaseException(); if ((ex is ThreadAbortException) == false) { // normal logging stuff } Hope this helps! David
September 10, 2005 4:56
Recycling bounces just the app domain. Does your code touch any files in your bin directory? If so, that can cause this problem. I had to learn this lesson the hard way, but that was clear back on 1.0, so things may be different now. Nevertheless, I still never touch anything in my bin dir from code.
September 10, 2005 5:09
ASP.net calls Thread.Abort in Response.End (which is called from Response.Redirect), as well as if the page times out. Depending on the amount of traffic, and how long the pages are taking to render, there may be requests that are timing out. This might be especially true if bots are crawling the category pages (which are quite expensive as they are bounded only by category) while you're getting alot of other traffic. That might explain why you started getting it "all of a sudden". You may have crossed some threshold of historical entries that's aggravating the situation. In both the Response.End and timeout cases, the inner exception is a HttpApplication.CancelModelException, which has a flag indicating if it was due to a timeout. So, you should be able to tell if it's one of those two scenarios. Just some thoughts. I've had lots of fun with aborting threads in ASP.net.
September 10, 2005 5:12
Hm...the timeout thing makes some sense...perhaps I've got a deadlock or overly aggressive locking? 0:000> !analyze -v ******************************************************************************* * * * Exception Analysis * * * ******************************************************************************* FAULTING_IP: +0 00000000 ?? ??? EXCEPTION_RECORD: ffffffff -- (.exr ffffffffffffffff) ExceptionAddress: 00000000 ExceptionCode: 80000007 (Wake debugger) ExceptionFlags: 00000000 NumberParameters: 0 BUGCHECK_STR: 80000007 DEFAULT_BUCKET_ID: APPLICATION_FAULT PROCESS_NAME: w3wp.exe ERROR_CODE: (NTSTATUS) 0x80000007 - {Kernel Debugger Awakened} the system debugger was awakened by an interrupt. LAST_CONTROL_TRANSFER: from 77f43741 to 7ffe0304 STACK_TEXT: 0006fe58 77f43741 77e41817 00000160 00000000 SharedUserData!SystemCallStub+0x4 0006fe5c 77e41817 00000160 00000000 00000000 ntdll!ZwWaitForSingleObject+0xc 0006fecc 77e4168f 00000160 ffffffff 00000000 kernel32!WaitForSingleObjectEx+0xac 0006fedc 5a3635ae 00000160 ffffffff 00000000 kernel32!WaitForSingleObject+0xf 0006feec 5a364d7d 00264e88 5a3a1d98 00000000 w3dt!WP_CONTEXT::RunMainThreadLoop+0xe 0006fef4 5a3a1d98 00000000 010013b4 5a3a5d54 w3dt!UlAtqStartListen+0x2d 0006ff00 5a3a5d54 010013ec 010013b4 010017af w3core!W3_SERVER::StartListen+0x8e 010012a0 72617453 00000074 6f727245 6f6c2072 w3core!UlW3Start+0xea WARNING: Frame IP not in any known module. Following frames may be wrong. 010012b0 6e696461 33572067 72657320 65636976 0x72617453 010012b4 33572067 72657320 65636976 6c6c6420 0x6e696461 010012b8 72657320 65636976 6c6c6420 77252720 0x33572067 010012bc 65636976 6c6c6420 77252720 202e2773 0x72657320 010012c0 6c6c6420 77252720 202e2773 72724520 0x65636976 010012c4 77252720 202e2773 72724520 3d20726f 0x6c6c6420 01001314 6820202e 203d2072 000a7825 6f727245 ole32!CPropertyBagEx::Open+0x1d6 01001340 6820202e 203d2072 000a7825 6f727245 0x6820202e 01001344 203d2072 000a7825 6f727245 6e692072 0x6820202e 01001348 000a7825 6f727245 6e692072 496f4320 0x203d2072 0100134c 6f727245 6e692072 496f4320 6974696e 0xa7825 01001350 6e692072 496f4320 6974696e 7a696c61 0x6f727245 01001354 496f4320 6974696e 7a696c61 28784565 0x6e692072 01001358 6974696e 7a696c61 28784565 20202e29 0x496f4320 0100135c 7a696c61 28784565 20202e29 3d207268 0x6974696e 01001360 28784565 20202e29 3d207268 0a782520 0x7a696c61 01001364 20202e29 3d207268 0a782520 00000000 0x28784565 01001368 3d207268 0a782520 00000000 38415f5f 0x20202e29 0100136c 0a782520 00000000 38415f5f 31533944 0x3d207268 01001370 00000000 38415f5f 31533944 5f32345f 0xa782520 FOLLOWUP_IP: w3dt!WP_CONTEXT::RunMainThreadLoop+e 5a3635ae 837e1400 cmp dword ptr [esi+0x14],0x0 SYMBOL_STACK_INDEX: 4 FOLLOWUP_NAME: MachineOwner SYMBOL_NAME: w3dt!WP_CONTEXT::RunMainThreadLoop+e MODULE_NAME: w3dt IMAGE_NAME: w3dt.dll DEBUG_FLR_IMAGE_TIMESTAMP: 3e802556 STACK_COMMAND: .ecxr ; kb FAILURE_BUCKET_ID: 80000007_w3dt!WP_CONTEXT::RunMainThreadLoop+e BUCKET_ID: 80000007_w3dt!WP_CONTEXT::RunMainThreadLoop+e Followup: MachineOwner ---------
September 11, 2005 8:31
> A. Nothing has changed in this code in months I agree with Mark: I think it's traffic related. Particularly if the code hasn't changed in a while and just magically started exhibiting this behavior. IIS 6 cycles ASP.NET every 29 hours by default; could that be causing this, if the asp.net app happens to be in the middle of an operation at the time? http://www.asp.net/faq/AspNetAndIIS6.aspx "By default IIS 6.0 is configured to recycle its worker process every 29 hours. This is a bit aggressive for an application running ASP.NET and it is recommended that automatic worker process recycling is disabled. " I *know* this caused some exceptions for us in load testing recently. Of course our server admin had inexplicably set this to 2 hours instead of the default 29..
September 14, 2005 19:42
While your debugging the latest dasBlog build I was wondering if any had seen this exception which seems to have appeared recently: Error: System.Web.HttpException: Invalid_Viewstate Client IP: 212.55.246.172 Port: 57771 User-Agent: Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0) ViewState: "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 Http-Referer: http://www.ryanstevens.co.uk/CommentView,guid,51ac246d-9bd6-4703-b71a-89a0d5e65c54.aspx Path: /CommentView.aspx. ---> System.FormatException: Invalid character in a Base-64 string. at System.Convert.FromBase64String(String s) at System.Web.UI.LosFormatter.Deserialize(String input) at System.Web.UI.Page.LoadPageStateFromPersistenceMedium() --- End of inner exception stack trace --- at System.Web.UI.Page.LoadPageStateFromPersistenceMedium() at System.Web.UI.Page.LoadPageViewState() at System.Web.UI.Page.ProcessRequestMain() while processing http://www.ryanstevens.co.uk/CommentView.aspx?guid=51ac246d-9bd6-4703-b71a-89a0d5e65c54. It appears to happen on different pages but always complaining that the view state contains invalid characters. Any ideas?

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