w3wp.exe halted with unhandled exception after reboot

[gkeongit]

Describe the bug

After starting my machine, all w3wp.exe processes for my ASP.NET Core applications were terminated due to an unhandled exception.

To Reproduce

I did not reproduce it yet, but I could attach a debugger to one of the w3wp.exe processes and isolate the following info:

// in AspNetCoreModuleV2\InProcessRequestHandler\inprocessapplication.cpp, line 190:

void IN_PROCESS_APPLICATION::ExecuteApplication()
{
// ...
// Line 274: 

	bool clrThreadExited;
	{
		auto redirectionOutput = LoggingHelpers::CreateOutputs(
						m_pConfig->QueryStdoutLogEnabled(),
						m_pConfig->QueryStdoutLogFile(),
						QueryApplicationPhysicalPath(),
						m_stringRedirectionOutput
				);
				// ...
				// Exception thrown at the end of this scope, when destructor of redirectionOutput 
				// calls d'tor of FileRedirectionOutput for stdout.log
	}

// There, in AspNetCoreModuleV2\CommonLib\RedirectionOutput.cpp, line 85:

FileRedirectionOutput::~FileRedirectionOutput()
{
	if (m_file.is_open())
	{
		// closing the stream attempts to clear the state
		m_file.close();
		//...
				
				
// then, in include\xiosbase, line 247:     

void __CLR_OR_THIS_CALL clear(iostate _State, bool _Reraise) { // set state, possibly reraise exception
	_State &= _Statmask;
	_Mystate             = _State;
	const auto _Filtered = _State & _Except;
	if (_Filtered) {
		if (_Reraise) {
		_RERAISE;
		}

		const char* _Msg;
		if (_Filtered & ios_base::badbit) {
			_Msg = "ios_base::badbit set";
		} else if (_Filtered & ios_base::failbit) {
			_Msg = "ios_base::failbit set";
		} else {
			_Msg = "ios_base::eofbit set";
		}

		_THROW(failure(_Msg));
		
		
		
// The _Msg thrown is "ios_base::failbit set";

The FileRedirectionOutput refers to the stdout log of yesterday, aspnetcore-stdout_20200817161241_724.log. This file was created, modified and accessed last time yesterday, ‎August ‎17, ‎2020, ‏‎6:12:42 PM. In the meantime, the machine has been shut down and today restarted.

Exceptions (if any)

Unhandled exception at 0x00007FFA820BDB9E (ucrtbase.dll) in w3wp.exe: Fatal program exit requested.

Further technical details

• ASP.NET Core version

TargetFramework netcoreapp3.1
Microsoft.AspNetCore FileVersion 3.100.320.12812

• Include the output of dotnet --info

.NET Core SDK (reflecting any global.json):
 Version:   3.1.401
 Commit:    5b6f5e5005

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.18363
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\3.1.401\

Host (useful for support):
  Version: 3.1.7
  Commit:  fcfdef8d6b

.NET Core SDKs installed:
  3.1.107 [C:\Program Files\dotnet\sdk]
  3.1.401 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
  Microsoft.AspNetCore.All 2.1.21 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.21 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.5 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.7 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.21 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.7 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.1.7 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET Core runtimes or SDKs:
  https://aka.ms/dotnet-download

• The IDE (VS / VS Code/ VS4Mac) you're running on, and it's version
  VS2019 Version 16.7.1

[BrennanConroy]

Can you see the event in Event Viewer and share that?

Is this a one-time issue or can you repro it?

[gkeongit]

Thank you for the quick response. Here is the application event log filtered by time range. You can see, that after the initial failure, other w3wp.exe processes failed also., but with a delay of ~15 min. This may be, because with the first errror, I attached a debugger to the faulted process, thus blocking it.

github issue 24997.zip

Today the error did not show up yet, so I still cannot reproduce it.

Thanks for contacting us.
We're moving this issue to the Next sprint planning milestone for future evaluation / consideration. We will evaluate the request when we are planning the work for the next milestone. To learn more about what to expect next and how this issue will be handled you can read more about our triage process here.

[gkeongit]

FYI: This morning after booting my machine it happened again for multiple w3wp.exe instances. The attached debugger for two of them showed exactly the same situation as described above. I attempted to save a dump, but it failed with 'Error saving dump. Only part of a ReadProcessMemory or WriteProcessMemory request was completed.'