I am looking for a solution for 6 hours already. Please read before marking it duplicate. There are tens of other questions like this but none has valid answer that works on all.
My IIS 8 defaultapppool start crashing all of sudden after 5 threshold warnings of:
A process serving application pool 'DefaultAppPool' suffered a fatal communication error with the Windows Process Activation Service. The process id was '3604'. The data field contains the error number.
And then this is the Event Viewer Error after 5 warnings
Faulting application name: w3wp.exe, version: 8.5.9600.16384, time stamp: 0x52157ba0
Faulting module name: KERNEL32.DLL, version: 6.3.9600.17415, time stamp: 0x545049be
Exception code: 0xc00000fd
Fault offset: 0x0001bb0b
Faulting process id: 0xd04
Yesterday: It crashed once and I just did right click on application pool > start.
Today: It crashed again around the same time (not exact). stopped every 5 minutes 6-7 times then start working normal until now.
Recycling is every 29 hours, and I don't think its recycling.
I installed DebugDiag to log crash dump after the last crash. With the instruction in https://stackoverflow.com/a/18335759/9357872 but no crash after that to see the results. But the regular ongoing log is indicating the following CLR Exception error:
DebugDiag Log:
CLR Exception on thread 4976. DetailID = 10
ASP.global_asax on thread 4976. DetailID = 2
Microsoft.CSharp.RuntimeBinder.Semantics.LangCompiler on thread 4008. DetailID = 7
Microsoft.CSharp.RuntimeBinder.Semantics.LangCompiler on thread 4008. DetailID = 7
Microsoft.CSharp.RuntimeBinder.Semantics.LangCompiler on thread 4008. DetailID = 7
Microsoft.CSharp.RuntimeBinder.Semantics.LangCompiler on thread 4008. DetailID = 7
Microsoft.CSharp.RuntimeBinder.Semantics.LangCompiler on thread 4008. DetailID = 7
Microsoft.CSharp.RuntimeBinder.Semantics.LangCompiler on thread 4008. DetailID = 7
Microsoft.CSharp.RuntimeBinder.Semantics.LangCompiler on thread 4008. DetailID = 7
Microsoft.CSharp.RuntimeBinder.Semantics.LangCompiler on thread 4008. DetailID = 7
I read that it is caused by using dynamics and memory leak; which I have never used in the whole website project
What is Microsoft.CSharp.RuntimeBinder.Semantics.LangCompiler ? I see there is something wrong in global.asax
Please help. Thanks.