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Deadlock in System.Web.Caching.Cache class

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Ivan Radovanovic

Deadlock in System.Web.Caching.Cache class

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Hello, I am experiencing weird deadlock in .net applications running
latest release version of mono (2.4.2.3) on FreeBSD (I don't think it is
OS specific, and it doesn't show all the times, but still often enough
so I can trace it)

Stack from thread 1:
    at
System.Web.Compilation.BuildManager.RemoveVirtualPathFromCaches(System.Web.VirtualPath
virtualPath)
    at
System.Web.Compilation.BuildManager.OnVirtualPathChanged(System.String
key, System.Object value, CacheItemRemovedReason removedReason)
    at System.Web.Caching.Cache.InvokePrivateCallbacks()
    at System.Web.HttpRuntime.ShutdownAppDomain(System.Object args)
====================================================================
Stack from thread 2:
    at System.Web.Caching.Cache.Add(System.String key, System.Object
value, System.Web.Caching.CacheDependency dependencies, DateTime
absoluteExpiration, TimeSpan slidingExpiration, CacheItemPriority
priority, System.Web.Caching.CacheItemRemovedCallback onRemoveCallback)
    at System.Web.Compilation.BuildManager.AddToCache(System.String
virtualPath, System.Web.Compilation.BuildProvider bp)
    at
System.Web.Compilation.BuildManager.GenerateAssembly(System.Web.Compilation.AssemblyBuilder
abuilder, System.Collections.Generic.List`1 buildItems,
System.Web.VirtualPath virtualPath, BuildKind buildKind)
    at
System.Web.Compilation.BuildManager.BuildAssembly(System.Web.VirtualPath
virtualPath)
    at System.Web.Compilation.BuildManager.GetCompiledType(System.String
virtualPath)
    at System.Web.Compilation.AspComponentFoundry+TagNameFoundry.LoadType()
    at
System.Web.Compilation.AspComponentFoundry+TagNameFoundry.GetType(System.String
componentName, System.String ByRef source, System.String ByRef ns)
    at
System.Web.Compilation.AspComponentFoundry.CreateComponent(System.Web.Compilation.Foundry
foundry, System.String tagName, System.String prefix, System.String tag)
    at
System.Web.Compilation.AspComponentFoundry.GetComponent(System.String
tagName)
    at System.Web.UI.RootBuilder.GetChildControlType(System.String
tagName, IDictionary attribs)
    at System.Web.UI.ControlBuilder.CreateSubBuilder(System.String
tagid, System.Collections.Hashtable atts, System.Type childType,
System.Web.UI.TemplateParser parser, ILocation location)
    at System.Web.Compilation.AspGenerator.ProcessTag(ILocation
location, System.String tagid, System.Web.Compilation.TagAttributes
atts, TagType tagtype, Boolean ByRef ignored)
    at System.Web.Compilation.AspGenerator.TagParsed(ILocation location,
TagType tagtype, System.String tagid,
System.Web.Compilation.TagAttributes attributes)
    at System.Web.Compilation.AspParser.OnTagParsed(TagType tagtype,
System.String id, System.Web.Compilation.TagAttributes attributes)
    at System.Web.Compilation.AspParser.Parse()
    at System.Web.Compilation.AspGenerator.Parse(System.IO.TextReader
reader, System.String filename, Boolean doInitParser)
    at System.Web.Compilation.GenericBuildProvider`1.Parse()
    at System.Web.Compilation.GenericBuildProvider`1.get_CodeCompilerType()
    at
System.Web.Compilation.BuildManager.GetCodeDomProviderType(System.Web.Compilation.BuildProvider
provider)
    at
System.Web.Compilation.BuildManager+BuildItem..ctor(System.Web.Compilation.BuildProvider
provider)
    at
System.Web.Compilation.BuildManager.LoadBuildProviders(System.Web.VirtualPath
virtualPath, System.String virtualDir,
System.Collections.Generic.Dictionary`2 vpCache, BuildKind ByRef kind,
System.String ByRef assemblyBaseName)
    at
System.Web.Compilation.BuildManager.BuildAssembly(System.Web.VirtualPath
virtualPath)
    at System.Web.Compilation.BuildManager.GetCompiledType(System.String
virtualPath)
    at System.Web.Compilation.AspComponentFoundry+TagNameFoundry.LoadType()
    at
System.Web.Compilation.AspComponentFoundry+TagNameFoundry.GetType(System.String
componentName, System.String ByRef source, System.String ByRef ns)
    at
System.Web.Compilation.AspComponentFoundry.CreateComponent(System.Web.Compilation.Foundry
foundry, System.String tagName, System.String prefix, System.String tag)
    at
System.Web.Compilation.AspComponentFoundry.GetComponent(System.String
tagName)
    at System.Web.UI.RootBuilder.GetChildControlType(System.String
tagName, IDictionary attribs)
    at System.Web.UI.ControlBuilder.CreateSubBuilder(System.String
tagid, System.Collections.Hashtable atts, System.Type childType,
System.Web.UI.TemplateParser parser, ILocation location)
    at System.Web.Compilation.AspGenerator.ProcessTag(ILocation
location, System.String tagid, System.Web.Compilation.TagAttributes
atts, TagType tagtype, Boolean ByRef ignored)
    at System.Web.Compilation.AspGenerator.TagParsed(ILocation location,
TagType tagtype, System.String tagid,
System.Web.Compilation.TagAttributes attributes)
    at System.Web.Compilation.AspParser.OnTagParsed(TagType tagtype,
System.String id, System.Web.Compilation.TagAttributes attributes)
    at System.Web.Compilation.AspParser.Parse()
    at System.Web.Compilation.AspGenerator.Parse(System.IO.TextReader
reader, System.String filename, Boolean doInitParser)
    at System.Web.Compilation.GenericBuildProvider`1.Parse()
    at System.Web.Compilation.GenericBuildProvider`1.get_CodeCompilerType()
    at
System.Web.Compilation.BuildManager.GetCodeDomProviderType(System.Web.Compilation.BuildProvider
provider)
    at
System.Web.Compilation.BuildManager+BuildItem..ctor(System.Web.Compilation.BuildProvider
provider)
    at
System.Web.Compilation.BuildManager.LoadBuildProviders(System.Web.VirtualPath
virtualPath, System.String virtualDir,
System.Collections.Generic.Dictionary`2 vpCache, BuildKind ByRef kind,
System.String ByRef assemblyBaseName)
    at
System.Web.Compilation.BuildManager.BuildAssembly(System.Web.VirtualPath
virtualPath)
    at System.Web.Compilation.BuildManager.GetCompiledType(System.String
virtualPath)
    at
System.Web.Compilation.BuildManager.CreateInstanceFromVirtualPath(System.String
virtualPath, System.Type requiredBaseType)
    at System.Web.UI.PageParser.GetCompiledPageInstance(System.String
virtualPath, System.String inputFile, System.Web.HttpContext context)
    at
System.Web.UI.PageHandlerFactory.GetHandler(System.Web.HttpContext
context, System.String requestType, System.String url, System.String path)
    at System.Web.HttpApplication.GetHandler(System.Web.HttpContext
context, System.String url, Boolean ignoreContextHandler)
    at System.Web.HttpApplication.GetHandler(System.Web.HttpContext
context, System.String url)
    at System.Web.HttpApplication+<Pipeline>c__Iterator2.MoveNext()
    at System.Web.HttpApplication.Tick()
    at System.Web.HttpApplication.Start(System.Object x)
    at
System.Web.HttpApplication.System.Web.IHttpHandler.ProcessRequest(System.Web.HttpContext
context)
    at System.Web.HttpRuntime.Process(System.Web.HttpWorkerRequest req)
    at System.Web.HttpRuntime.RealProcessRequest(System.Object o)
    at
System.Web.HttpRuntime.ProcessRequest(System.Web.HttpWorkerRequest wr)
    at Mono.WebServer.MonoWorkerRequest.ProcessRequest()
    at
Mono.WebServer.BaseApplicationHost.ProcessRequest(Mono.WebServer.MonoWorkerRequest
mwr)
    at Mono.WebServer.XSPApplicationHost.ProcessRequest(Int32 reqId,
Int64 localEPAddr, Int32 localEPPort, Int64 remoteEPAdds, Int32
remoteEPPort, System.String verb, System.String path, System.String
queryString, System.String protocol, System.Byte[] inputBuffer,
System.String redirect, IntPtr socket, Mono.WebServer.SslInformations ssl)
    at Mono.WebServer.XSPWorker.RunInternal(System.Object state)
===============================================================================

As you can see there is deadlock between
System.Web.Compilation.BuildManager.AddToCache (thread 2, second item)
and System.Web.Compilation.BuildManager.GenerateAssembly (both using
lock (buildCacheLock)) and between System.Web.Caching.Cache.Add and
System.Web.Caching.Cache.InvokePrivateCallbacks() (both using lock(cache))

I am curious if someone is working on this bug (is this known bug?) or I
should try to fix it myself?

Best regards,
Ivan
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Ivan Radovanovic

Re: Deadlock in System.Web.Caching.Cache class

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Although this dead lock problem continues to potentially exists it seems
that problem is after all OS specific - there is some weird behavior of
fam/gamin reporting that bin/*.dll files are changed, causing ASP.Net
runtime trying to restart application, while at the same time trying to
compile *.aspx, *.ascx etc.
Maybe deadlock can occur in normal conditions too (servicing some
request that would need compiling of some control/page that is not
compiled yet and replacing something in bin directory at the same time),
but that should be rare enough :-)

Regards

Ivan Radovanovic napisa:

> Hello, I am experiencing weird deadlock in .net applications running
> latest release version of mono (2.4.2.3) on FreeBSD (I don't think it is
> OS specific, and it doesn't show all the times, but still often enough
> so I can trace it)
>
> Stack from thread 1:
>    at
> System.Web.Compilation.BuildManager.RemoveVirtualPathFromCaches(System.Web.VirtualPath
> virtualPath)
>    at
> System.Web.Compilation.BuildManager.OnVirtualPathChanged(System.String
> key, System.Object value, CacheItemRemovedReason removedReason)
>    at System.Web.Caching.Cache.InvokePrivateCallbacks()
>    at System.Web.HttpRuntime.ShutdownAppDomain(System.Object args)
> ====================================================================
> Stack from thread 2:
>    at System.Web.Caching.Cache.Add(System.String key, System.Object
> value, System.Web.Caching.CacheDependency dependencies, DateTime
> absoluteExpiration, TimeSpan slidingExpiration, CacheItemPriority
> priority, System.Web.Caching.CacheItemRemovedCallback onRemoveCallback)
>    at System.Web.Compilation.BuildManager.AddToCache(System.String
> virtualPath, System.Web.Compilation.BuildProvider bp)
>    at
> System.Web.Compilation.BuildManager.GenerateAssembly(System.Web.Compilation.AssemblyBuilder
> abuilder, System.Collections.Generic.List`1 buildItems,
> System.Web.VirtualPath virtualPath, BuildKind buildKind)
>    at
> System.Web.Compilation.BuildManager.BuildAssembly(System.Web.VirtualPath
> virtualPath)
>    at System.Web.Compilation.BuildManager.GetCompiledType(System.String
> virtualPath)
>    at System.Web.Compilation.AspComponentFoundry+TagNameFoundry.LoadType()
>    at
> System.Web.Compilation.AspComponentFoundry+TagNameFoundry.GetType(System.String
> componentName, System.String ByRef source, System.String ByRef ns)
>    at
> System.Web.Compilation.AspComponentFoundry.CreateComponent(System.Web.Compilation.Foundry
> foundry, System.String tagName, System.String prefix, System.String tag)
>    at
> System.Web.Compilation.AspComponentFoundry.GetComponent(System.String
> tagName)
>    at System.Web.UI.RootBuilder.GetChildControlType(System.String
> tagName, IDictionary attribs)
>    at System.Web.UI.ControlBuilder.CreateSubBuilder(System.String tagid,
> System.Collections.Hashtable atts, System.Type childType,
> System.Web.UI.TemplateParser parser, ILocation location)
>    at System.Web.Compilation.AspGenerator.ProcessTag(ILocation location,
> System.String tagid, System.Web.Compilation.TagAttributes atts, TagType
> tagtype, Boolean ByRef ignored)
>    at System.Web.Compilation.AspGenerator.TagParsed(ILocation location,
> TagType tagtype, System.String tagid,
> System.Web.Compilation.TagAttributes attributes)
>    at System.Web.Compilation.AspParser.OnTagParsed(TagType tagtype,
> System.String id, System.Web.Compilation.TagAttributes attributes)
>    at System.Web.Compilation.AspParser.Parse()
>    at System.Web.Compilation.AspGenerator.Parse(System.IO.TextReader
> reader, System.String filename, Boolean doInitParser)
>    at System.Web.Compilation.GenericBuildProvider`1.Parse()
>    at System.Web.Compilation.GenericBuildProvider`1.get_CodeCompilerType()
>    at
> System.Web.Compilation.BuildManager.GetCodeDomProviderType(System.Web.Compilation.BuildProvider
> provider)
>    at
> System.Web.Compilation.BuildManager+BuildItem..ctor(System.Web.Compilation.BuildProvider
> provider)
>    at
> System.Web.Compilation.BuildManager.LoadBuildProviders(System.Web.VirtualPath
> virtualPath, System.String virtualDir,
> System.Collections.Generic.Dictionary`2 vpCache, BuildKind ByRef kind,
> System.String ByRef assemblyBaseName)
>    at
> System.Web.Compilation.BuildManager.BuildAssembly(System.Web.VirtualPath
> virtualPath)
>    at System.Web.Compilation.BuildManager.GetCompiledType(System.String
> virtualPath)
>    at System.Web.Compilation.AspComponentFoundry+TagNameFoundry.LoadType()
>    at
> System.Web.Compilation.AspComponentFoundry+TagNameFoundry.GetType(System.String
> componentName, System.String ByRef source, System.String ByRef ns)
>    at
> System.Web.Compilation.AspComponentFoundry.CreateComponent(System.Web.Compilation.Foundry
> foundry, System.String tagName, System.String prefix, System.String tag)
>    at
> System.Web.Compilation.AspComponentFoundry.GetComponent(System.String
> tagName)
>    at System.Web.UI.RootBuilder.GetChildControlType(System.String
> tagName, IDictionary attribs)
>    at System.Web.UI.ControlBuilder.CreateSubBuilder(System.String tagid,
> System.Collections.Hashtable atts, System.Type childType,
> System.Web.UI.TemplateParser parser, ILocation location)
>    at System.Web.Compilation.AspGenerator.ProcessTag(ILocation location,
> System.String tagid, System.Web.Compilation.TagAttributes atts, TagType
> tagtype, Boolean ByRef ignored)
>    at System.Web.Compilation.AspGenerator.TagParsed(ILocation location,
> TagType tagtype, System.String tagid,
> System.Web.Compilation.TagAttributes attributes)
>    at System.Web.Compilation.AspParser.OnTagParsed(TagType tagtype,
> System.String id, System.Web.Compilation.TagAttributes attributes)
>    at System.Web.Compilation.AspParser.Parse()
>    at System.Web.Compilation.AspGenerator.Parse(System.IO.TextReader
> reader, System.String filename, Boolean doInitParser)
>    at System.Web.Compilation.GenericBuildProvider`1.Parse()
>    at System.Web.Compilation.GenericBuildProvider`1.get_CodeCompilerType()
>    at
> System.Web.Compilation.BuildManager.GetCodeDomProviderType(System.Web.Compilation.BuildProvider
> provider)
>    at
> System.Web.Compilation.BuildManager+BuildItem..ctor(System.Web.Compilation.BuildProvider
> provider)
>    at
> System.Web.Compilation.BuildManager.LoadBuildProviders(System.Web.VirtualPath
> virtualPath, System.String virtualDir,
> System.Collections.Generic.Dictionary`2 vpCache, BuildKind ByRef kind,
> System.String ByRef assemblyBaseName)
>    at
> System.Web.Compilation.BuildManager.BuildAssembly(System.Web.VirtualPath
> virtualPath)
>    at System.Web.Compilation.BuildManager.GetCompiledType(System.String
> virtualPath)
>    at
> System.Web.Compilation.BuildManager.CreateInstanceFromVirtualPath(System.String
> virtualPath, System.Type requiredBaseType)
>    at System.Web.UI.PageParser.GetCompiledPageInstance(System.String
> virtualPath, System.String inputFile, System.Web.HttpContext context)
>    at System.Web.UI.PageHandlerFactory.GetHandler(System.Web.HttpContext
> context, System.String requestType, System.String url, System.String path)
>    at System.Web.HttpApplication.GetHandler(System.Web.HttpContext
> context, System.String url, Boolean ignoreContextHandler)
>    at System.Web.HttpApplication.GetHandler(System.Web.HttpContext
> context, System.String url)
>    at System.Web.HttpApplication+<Pipeline>c__Iterator2.MoveNext()
>    at System.Web.HttpApplication.Tick()
>    at System.Web.HttpApplication.Start(System.Object x)
>    at
> System.Web.HttpApplication.System.Web.IHttpHandler.ProcessRequest(System.Web.HttpContext
> context)
>    at System.Web.HttpRuntime.Process(System.Web.HttpWorkerRequest req)
>    at System.Web.HttpRuntime.RealProcessRequest(System.Object o)
>    at System.Web.HttpRuntime.ProcessRequest(System.Web.HttpWorkerRequest
> wr)
>    at Mono.WebServer.MonoWorkerRequest.ProcessRequest()
>    at
> Mono.WebServer.BaseApplicationHost.ProcessRequest(Mono.WebServer.MonoWorkerRequest
> mwr)
>    at Mono.WebServer.XSPApplicationHost.ProcessRequest(Int32 reqId,
> Int64 localEPAddr, Int32 localEPPort, Int64 remoteEPAdds, Int32
> remoteEPPort, System.String verb, System.String path, System.String
> queryString, System.String protocol, System.Byte[] inputBuffer,
> System.String redirect, IntPtr socket, Mono.WebServer.SslInformations ssl)
>    at Mono.WebServer.XSPWorker.RunInternal(System.Object state)
> ===============================================================================
>
>
> As you can see there is deadlock between
> System.Web.Compilation.BuildManager.AddToCache (thread 2, second item)
> and System.Web.Compilation.BuildManager.GenerateAssembly (both using
> lock (buildCacheLock)) and between System.Web.Caching.Cache.Add and
> System.Web.Caching.Cache.InvokePrivateCallbacks() (both using lock(cache))
>
> I am curious if someone is working on this bug (is this known bug?) or I
> should try to fix it myself?
>
> Best regards,
> Ivan
>
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Robert Jordan

Re: Deadlock in System.Web.Caching.Cache class

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Ivan Radovanovic wrote:
> Although this dead lock problem continues to potentially exists it seems
> that problem is after all OS specific - there is some weird behavior of
> fam/gamin reporting that bin/*.dll files are changed, causing ASP.Net
> runtime trying to restart application, while at the same time trying to
> compile *.aspx, *.ascx etc.
> Maybe deadlock can occur in normal conditions too (servicing some
> request that would need compiling of some control/page that is not
> compiled yet and replacing something in bin directory at the same time),
> but that should be rare enough :-)

Try to disable the file system watcher as described here:

http://twistedcode.net/blog/post/2009/05/13/Tip-Mono-ASPNET-application-burning-CPU-in-idle-state-FileSystemWatcher.aspx

Robert

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Marek Habersack

Re: Deadlock in System.Web.Caching.Cache class

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In reply to this post by Ivan Radovanovic
Ivan Radovanovic wrote:
> Although this dead lock problem continues to potentially exists it seems
> that problem is after all OS specific - there is some weird behavior of
> fam/gamin reporting that bin/*.dll files are changed, causing ASP.Net
> runtime trying to restart application, while at the same time trying to
> compile *.aspx, *.ascx etc.
The issue might be in FAM FileSystemWatcher backend then.

> Maybe deadlock can occur in normal conditions too (servicing some
> request that would need compiling of some control/page that is not
> compiled yet and replacing something in bin directory at the same time),
> but that should be rare enough :-)
The BuildManager in 2.4 has some bugs indeed, which in certain cases can lead to deadlocks (it's,
among others, related to recursive dependencies between application files). For that reason I
rewrote BuildManager for 2.6+ - if the problem you're seeing turns out to be an issue with more than
few environments, I can just copy the new code to 2.4 branch for a future release. If you can come
up with a test case that triggers the issue on your system, then please file a bug report and attach
the testcase including OS/environment details.

marek

>
> Regards
>
> Ivan Radovanovic napisa:
>> Hello, I am experiencing weird deadlock in .net applications running
>> latest release version of mono (2.4.2.3) on FreeBSD (I don't think it is
>> OS specific, and it doesn't show all the times, but still often enough
>> so I can trace it)
>>
>> Stack from thread 1:
>>    at
>> System.Web.Compilation.BuildManager.RemoveVirtualPathFromCaches(System.Web.VirtualPath
>> virtualPath)
>>    at
>> System.Web.Compilation.BuildManager.OnVirtualPathChanged(System.String
>> key, System.Object value, CacheItemRemovedReason removedReason)
>>    at System.Web.Caching.Cache.InvokePrivateCallbacks()
>>    at System.Web.HttpRuntime.ShutdownAppDomain(System.Object args)
>> ====================================================================
>> Stack from thread 2:
>>    at System.Web.Caching.Cache.Add(System.String key, System.Object
>> value, System.Web.Caching.CacheDependency dependencies, DateTime
>> absoluteExpiration, TimeSpan slidingExpiration, CacheItemPriority
>> priority, System.Web.Caching.CacheItemRemovedCallback onRemoveCallback)
>>    at System.Web.Compilation.BuildManager.AddToCache(System.String
>> virtualPath, System.Web.Compilation.BuildProvider bp)
>>    at
>> System.Web.Compilation.BuildManager.GenerateAssembly(System.Web.Compilation.AssemblyBuilder
>> abuilder, System.Collections.Generic.List`1 buildItems,
>> System.Web.VirtualPath virtualPath, BuildKind buildKind)
>>    at
>> System.Web.Compilation.BuildManager.BuildAssembly(System.Web.VirtualPath
>> virtualPath)
>>    at System.Web.Compilation.BuildManager.GetCompiledType(System.String
>> virtualPath)
>>    at System.Web.Compilation.AspComponentFoundry+TagNameFoundry.LoadType()
>>    at
>> System.Web.Compilation.AspComponentFoundry+TagNameFoundry.GetType(System.String
>> componentName, System.String ByRef source, System.String ByRef ns)
>>    at
>> System.Web.Compilation.AspComponentFoundry.CreateComponent(System.Web.Compilation.Foundry
>> foundry, System.String tagName, System.String prefix, System.String tag)
>>    at
>> System.Web.Compilation.AspComponentFoundry.GetComponent(System.String
>> tagName)
>>    at System.Web.UI.RootBuilder.GetChildControlType(System.String
>> tagName, IDictionary attribs)
>>    at System.Web.UI.ControlBuilder.CreateSubBuilder(System.String tagid,
>> System.Collections.Hashtable atts, System.Type childType,
>> System.Web.UI.TemplateParser parser, ILocation location)
>>    at System.Web.Compilation.AspGenerator.ProcessTag(ILocation location,
>> System.String tagid, System.Web.Compilation.TagAttributes atts, TagType
>> tagtype, Boolean ByRef ignored)
>>    at System.Web.Compilation.AspGenerator.TagParsed(ILocation location,
>> TagType tagtype, System.String tagid,
>> System.Web.Compilation.TagAttributes attributes)
>>    at System.Web.Compilation.AspParser.OnTagParsed(TagType tagtype,
>> System.String id, System.Web.Compilation.TagAttributes attributes)
>>    at System.Web.Compilation.AspParser.Parse()
>>    at System.Web.Compilation.AspGenerator.Parse(System.IO.TextReader
>> reader, System.String filename, Boolean doInitParser)
>>    at System.Web.Compilation.GenericBuildProvider`1.Parse()
>>    at System.Web.Compilation.GenericBuildProvider`1.get_CodeCompilerType()
>>    at
>> System.Web.Compilation.BuildManager.GetCodeDomProviderType(System.Web.Compilation.BuildProvider
>> provider)
>>    at
>> System.Web.Compilation.BuildManager+BuildItem..ctor(System.Web.Compilation.BuildProvider
>> provider)
>>    at
>> System.Web.Compilation.BuildManager.LoadBuildProviders(System.Web.VirtualPath
>> virtualPath, System.String virtualDir,
>> System.Collections.Generic.Dictionary`2 vpCache, BuildKind ByRef kind,
>> System.String ByRef assemblyBaseName)
>>    at
>> System.Web.Compilation.BuildManager.BuildAssembly(System.Web.VirtualPath
>> virtualPath)
>>    at System.Web.Compilation.BuildManager.GetCompiledType(System.String
>> virtualPath)
>>    at System.Web.Compilation.AspComponentFoundry+TagNameFoundry.LoadType()
>>    at
>> System.Web.Compilation.AspComponentFoundry+TagNameFoundry.GetType(System.String
>> componentName, System.String ByRef source, System.String ByRef ns)
>>    at
>> System.Web.Compilation.AspComponentFoundry.CreateComponent(System.Web.Compilation.Foundry
>> foundry, System.String tagName, System.String prefix, System.String tag)
>>    at
>> System.Web.Compilation.AspComponentFoundry.GetComponent(System.String
>> tagName)
>>    at System.Web.UI.RootBuilder.GetChildControlType(System.String
>> tagName, IDictionary attribs)
>>    at System.Web.UI.ControlBuilder.CreateSubBuilder(System.String tagid,
>> System.Collections.Hashtable atts, System.Type childType,
>> System.Web.UI.TemplateParser parser, ILocation location)
>>    at System.Web.Compilation.AspGenerator.ProcessTag(ILocation location,
>> System.String tagid, System.Web.Compilation.TagAttributes atts, TagType
>> tagtype, Boolean ByRef ignored)
>>    at System.Web.Compilation.AspGenerator.TagParsed(ILocation location,
>> TagType tagtype, System.String tagid,
>> System.Web.Compilation.TagAttributes attributes)
>>    at System.Web.Compilation.AspParser.OnTagParsed(TagType tagtype,
>> System.String id, System.Web.Compilation.TagAttributes attributes)
>>    at System.Web.Compilation.AspParser.Parse()
>>    at System.Web.Compilation.AspGenerator.Parse(System.IO.TextReader
>> reader, System.String filename, Boolean doInitParser)
>>    at System.Web.Compilation.GenericBuildProvider`1.Parse()
>>    at System.Web.Compilation.GenericBuildProvider`1.get_CodeCompilerType()
>>    at
>> System.Web.Compilation.BuildManager.GetCodeDomProviderType(System.Web.Compilation.BuildProvider
>> provider)
>>    at
>> System.Web.Compilation.BuildManager+BuildItem..ctor(System.Web.Compilation.BuildProvider
>> provider)
>>    at
>> System.Web.Compilation.BuildManager.LoadBuildProviders(System.Web.VirtualPath
>> virtualPath, System.String virtualDir,
>> System.Collections.Generic.Dictionary`2 vpCache, BuildKind ByRef kind,
>> System.String ByRef assemblyBaseName)
>>    at
>> System.Web.Compilation.BuildManager.BuildAssembly(System.Web.VirtualPath
>> virtualPath)
>>    at System.Web.Compilation.BuildManager.GetCompiledType(System.String
>> virtualPath)
>>    at
>> System.Web.Compilation.BuildManager.CreateInstanceFromVirtualPath(System.String
>> virtualPath, System.Type requiredBaseType)
>>    at System.Web.UI.PageParser.GetCompiledPageInstance(System.String
>> virtualPath, System.String inputFile, System.Web.HttpContext context)
>>    at System.Web.UI.PageHandlerFactory.GetHandler(System.Web.HttpContext
>> context, System.String requestType, System.String url, System.String path)
>>    at System.Web.HttpApplication.GetHandler(System.Web.HttpContext
>> context, System.String url, Boolean ignoreContextHandler)
>>    at System.Web.HttpApplication.GetHandler(System.Web.HttpContext
>> context, System.String url)
>>    at System.Web.HttpApplication+<Pipeline>c__Iterator2.MoveNext()
>>    at System.Web.HttpApplication.Tick()
>>    at System.Web.HttpApplication.Start(System.Object x)
>>    at
>> System.Web.HttpApplication.System.Web.IHttpHandler.ProcessRequest(System.Web.HttpContext
>> context)
>>    at System.Web.HttpRuntime.Process(System.Web.HttpWorkerRequest req)
>>    at System.Web.HttpRuntime.RealProcessRequest(System.Object o)
>>    at System.Web.HttpRuntime.ProcessRequest(System.Web.HttpWorkerRequest
>> wr)
>>    at Mono.WebServer.MonoWorkerRequest.ProcessRequest()
>>    at
>> Mono.WebServer.BaseApplicationHost.ProcessRequest(Mono.WebServer.MonoWorkerRequest
>> mwr)
>>    at Mono.WebServer.XSPApplicationHost.ProcessRequest(Int32 reqId,
>> Int64 localEPAddr, Int32 localEPPort, Int64 remoteEPAdds, Int32
>> remoteEPPort, System.String verb, System.String path, System.String
>> queryString, System.String protocol, System.Byte[] inputBuffer,
>> System.String redirect, IntPtr socket, Mono.WebServer.SslInformations ssl)
>>    at Mono.WebServer.XSPWorker.RunInternal(System.Object state)
>> ===============================================================================
>>
>>
>> As you can see there is deadlock between
>> System.Web.Compilation.BuildManager.AddToCache (thread 2, second item)
>> and System.Web.Compilation.BuildManager.GenerateAssembly (both using
>> lock (buildCacheLock)) and between System.Web.Caching.Cache.Add and
>> System.Web.Caching.Cache.InvokePrivateCallbacks() (both using lock(cache))
>>
>> I am curious if someone is working on this bug (is this known bug?) or I
>> should try to fix it myself?
>>
>> Best regards,
>> Ivan
>>
> _______________________________________________
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> [hidden email]
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Ivan Radovanovic

Re: Deadlock in System.Web.Caching.Cache class

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Issue was in bad patch applied on mono/metadata/filewatcher.c - so no
errors on mono side :-)
I will try to create test case for this deadlock, since it is not OS
dependent, but anyway I don't think it is very serious

Best regards,
Ivan

Marek Habersack napisa:

> Ivan Radovanovic wrote:
>> Although this dead lock problem continues to potentially exists it
>> seems that problem is after all OS specific - there is some weird
>> behavior of fam/gamin reporting that bin/*.dll files are changed,
>> causing ASP.Net runtime trying to restart application, while at the
>> same time trying to compile *.aspx, *.ascx etc.
> The issue might be in FAM FileSystemWatcher backend then.
>
>> Maybe deadlock can occur in normal conditions too (servicing some
>> request that would need compiling of some control/page that is not
>> compiled yet and replacing something in bin directory at the same
>> time), but that should be rare enough :-)
> The BuildManager in 2.4 has some bugs indeed, which in certain cases can
> lead to deadlocks (it's, among others, related to recursive dependencies
> between application files). For that reason I rewrote BuildManager for
> 2.6+ - if the problem you're seeing turns out to be an issue with more
> than few environments, I can just copy the new code to 2.4 branch for a
> future release. If you can come up with a test case that triggers the
> issue on your system, then please file a bug report and attach the
> testcase including OS/environment details.
>
> marek
>>
>> Regards
>>
>> Ivan Radovanovic napisa:
>>> Hello, I am experiencing weird deadlock in .net applications running
>>> latest release version of mono (2.4.2.3) on FreeBSD (I don't think it
>>> is OS specific, and it doesn't show all the times, but still often
>>> enough so I can trace it)
>>>
>>> Stack from thread 1:
>>>    at
>>> System.Web.Compilation.BuildManager.RemoveVirtualPathFromCaches(System.Web.VirtualPath
>>> virtualPath)
>>>    at
>>> System.Web.Compilation.BuildManager.OnVirtualPathChanged(System.String
>>> key, System.Object value, CacheItemRemovedReason removedReason)
>>>    at System.Web.Caching.Cache.InvokePrivateCallbacks()
>>>    at System.Web.HttpRuntime.ShutdownAppDomain(System.Object args)
>>> ====================================================================
>>> Stack from thread 2:
>>>    at System.Web.Caching.Cache.Add(System.String key, System.Object
>>> value, System.Web.Caching.CacheDependency dependencies, DateTime
>>> absoluteExpiration, TimeSpan slidingExpiration, CacheItemPriority
>>> priority, System.Web.Caching.CacheItemRemovedCallback onRemoveCallback)
>>>    at System.Web.Compilation.BuildManager.AddToCache(System.String
>>> virtualPath, System.Web.Compilation.BuildProvider bp)
>>>    at
>>> System.Web.Compilation.BuildManager.GenerateAssembly(System.Web.Compilation.AssemblyBuilder
>>> abuilder, System.Collections.Generic.List`1 buildItems,
>>> System.Web.VirtualPath virtualPath, BuildKind buildKind)
>>>    at
>>> System.Web.Compilation.BuildManager.BuildAssembly(System.Web.VirtualPath
>>> virtualPath)
>>>    at
>>> System.Web.Compilation.BuildManager.GetCompiledType(System.String
>>> virtualPath)
>>>    at
>>> System.Web.Compilation.AspComponentFoundry+TagNameFoundry.LoadType()
>>>    at
>>> System.Web.Compilation.AspComponentFoundry+TagNameFoundry.GetType(System.String
>>> componentName, System.String ByRef source, System.String ByRef ns)
>>>    at
>>> System.Web.Compilation.AspComponentFoundry.CreateComponent(System.Web.Compilation.Foundry
>>> foundry, System.String tagName, System.String prefix, System.String tag)
>>>    at
>>> System.Web.Compilation.AspComponentFoundry.GetComponent(System.String
>>> tagName)
>>>    at System.Web.UI.RootBuilder.GetChildControlType(System.String
>>> tagName, IDictionary attribs)
>>>    at System.Web.UI.ControlBuilder.CreateSubBuilder(System.String
>>> tagid, System.Collections.Hashtable atts, System.Type childType,
>>> System.Web.UI.TemplateParser parser, ILocation location)
>>>    at System.Web.Compilation.AspGenerator.ProcessTag(ILocation
>>> location, System.String tagid, System.Web.Compilation.TagAttributes
>>> atts, TagType tagtype, Boolean ByRef ignored)
>>>    at System.Web.Compilation.AspGenerator.TagParsed(ILocation
>>> location, TagType tagtype, System.String tagid,
>>> System.Web.Compilation.TagAttributes attributes)
>>>    at System.Web.Compilation.AspParser.OnTagParsed(TagType tagtype,
>>> System.String id, System.Web.Compilation.TagAttributes attributes)
>>>    at System.Web.Compilation.AspParser.Parse()
>>>    at System.Web.Compilation.AspGenerator.Parse(System.IO.TextReader
>>> reader, System.String filename, Boolean doInitParser)
>>>    at System.Web.Compilation.GenericBuildProvider`1.Parse()
>>>    at
>>> System.Web.Compilation.GenericBuildProvider`1.get_CodeCompilerType()
>>>    at
>>> System.Web.Compilation.BuildManager.GetCodeDomProviderType(System.Web.Compilation.BuildProvider
>>> provider)
>>>    at
>>> System.Web.Compilation.BuildManager+BuildItem..ctor(System.Web.Compilation.BuildProvider
>>> provider)
>>>    at
>>> System.Web.Compilation.BuildManager.LoadBuildProviders(System.Web.VirtualPath
>>> virtualPath, System.String virtualDir,
>>> System.Collections.Generic.Dictionary`2 vpCache, BuildKind ByRef
>>> kind, System.String ByRef assemblyBaseName)
>>>    at
>>> System.Web.Compilation.BuildManager.BuildAssembly(System.Web.VirtualPath
>>> virtualPath)
>>>    at
>>> System.Web.Compilation.BuildManager.GetCompiledType(System.String
>>> virtualPath)
>>>    at
>>> System.Web.Compilation.AspComponentFoundry+TagNameFoundry.LoadType()
>>>    at
>>> System.Web.Compilation.AspComponentFoundry+TagNameFoundry.GetType(System.String
>>> componentName, System.String ByRef source, System.String ByRef ns)
>>>    at
>>> System.Web.Compilation.AspComponentFoundry.CreateComponent(System.Web.Compilation.Foundry
>>> foundry, System.String tagName, System.String prefix, System.String tag)
>>>    at
>>> System.Web.Compilation.AspComponentFoundry.GetComponent(System.String
>>> tagName)
>>>    at System.Web.UI.RootBuilder.GetChildControlType(System.String
>>> tagName, IDictionary attribs)
>>>    at System.Web.UI.ControlBuilder.CreateSubBuilder(System.String
>>> tagid, System.Collections.Hashtable atts, System.Type childType,
>>> System.Web.UI.TemplateParser parser, ILocation location)
>>>    at System.Web.Compilation.AspGenerator.ProcessTag(ILocation
>>> location, System.String tagid, System.Web.Compilation.TagAttributes
>>> atts, TagType tagtype, Boolean ByRef ignored)
>>>    at System.Web.Compilation.AspGenerator.TagParsed(ILocation
>>> location, TagType tagtype, System.String tagid,
>>> System.Web.Compilation.TagAttributes attributes)
>>>    at System.Web.Compilation.AspParser.OnTagParsed(TagType tagtype,
>>> System.String id, System.Web.Compilation.TagAttributes attributes)
>>>    at System.Web.Compilation.AspParser.Parse()
>>>    at System.Web.Compilation.AspGenerator.Parse(System.IO.TextReader
>>> reader, System.String filename, Boolean doInitParser)
>>>    at System.Web.Compilation.GenericBuildProvider`1.Parse()
>>>    at
>>> System.Web.Compilation.GenericBuildProvider`1.get_CodeCompilerType()
>>>    at
>>> System.Web.Compilation.BuildManager.GetCodeDomProviderType(System.Web.Compilation.BuildProvider
>>> provider)
>>>    at
>>> System.Web.Compilation.BuildManager+BuildItem..ctor(System.Web.Compilation.BuildProvider
>>> provider)
>>>    at
>>> System.Web.Compilation.BuildManager.LoadBuildProviders(System.Web.VirtualPath
>>> virtualPath, System.String virtualDir,
>>> System.Collections.Generic.Dictionary`2 vpCache, BuildKind ByRef
>>> kind, System.String ByRef assemblyBaseName)
>>>    at
>>> System.Web.Compilation.BuildManager.BuildAssembly(System.Web.VirtualPath
>>> virtualPath)
>>>    at
>>> System.Web.Compilation.BuildManager.GetCompiledType(System.String
>>> virtualPath)
>>>    at
>>> System.Web.Compilation.BuildManager.CreateInstanceFromVirtualPath(System.String
>>> virtualPath, System.Type requiredBaseType)
>>>    at System.Web.UI.PageParser.GetCompiledPageInstance(System.String
>>> virtualPath, System.String inputFile, System.Web.HttpContext context)
>>>    at
>>> System.Web.UI.PageHandlerFactory.GetHandler(System.Web.HttpContext
>>> context, System.String requestType, System.String url, System.String
>>> path)
>>>    at System.Web.HttpApplication.GetHandler(System.Web.HttpContext
>>> context, System.String url, Boolean ignoreContextHandler)
>>>    at System.Web.HttpApplication.GetHandler(System.Web.HttpContext
>>> context, System.String url)
>>>    at System.Web.HttpApplication+<Pipeline>c__Iterator2.MoveNext()
>>>    at System.Web.HttpApplication.Tick()
>>>    at System.Web.HttpApplication.Start(System.Object x)
>>>    at
>>> System.Web.HttpApplication.System.Web.IHttpHandler.ProcessRequest(System.Web.HttpContext
>>> context)
>>>    at System.Web.HttpRuntime.Process(System.Web.HttpWorkerRequest req)
>>>    at System.Web.HttpRuntime.RealProcessRequest(System.Object o)
>>>    at
>>> System.Web.HttpRuntime.ProcessRequest(System.Web.HttpWorkerRequest wr)
>>>    at Mono.WebServer.MonoWorkerRequest.ProcessRequest()
>>>    at
>>> Mono.WebServer.BaseApplicationHost.ProcessRequest(Mono.WebServer.MonoWorkerRequest
>>> mwr)
>>>    at Mono.WebServer.XSPApplicationHost.ProcessRequest(Int32 reqId,
>>> Int64 localEPAddr, Int32 localEPPort, Int64 remoteEPAdds, Int32
>>> remoteEPPort, System.String verb, System.String path, System.String
>>> queryString, System.String protocol, System.Byte[] inputBuffer,
>>> System.String redirect, IntPtr socket, Mono.WebServer.SslInformations
>>> ssl)
>>>    at Mono.WebServer.XSPWorker.RunInternal(System.Object state)
>>> ===============================================================================
>>>
>>>
>>> As you can see there is deadlock between
>>> System.Web.Compilation.BuildManager.AddToCache (thread 2, second
>>> item) and System.Web.Compilation.BuildManager.GenerateAssembly (both
>>> using lock (buildCacheLock)) and between System.Web.Caching.Cache.Add
>>> and System.Web.Caching.Cache.InvokePrivateCallbacks() (both using
>>> lock(cache))
>>>
>>> I am curious if someone is working on this bug (is this known bug?)
>>> or I should try to fix it myself?
>>>
>>> Best regards,
>>> Ivan
>>>
>> _______________________________________________
>> Mono-devel-list mailing list
>> [hidden email]
>> http://lists.ximian.com/mailman/listinfo/mono-devel-list
>>
>
>
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