ANCM graceful shutdown feature has a problem on Windows 7 OS if an aspnetcore app is hosted to IIS web server. After starting the aspnetcore app, stopping or recycling an IIS worker process which is used by the aspnetcore web application can cause a crash to the worker process (w3wp.exe).
When the crash happens, you will see as an event viewer error.

ID: 1000
Source: Application Error
Faulting application name: w3wp.exe
...
Faulting module name: ntdll.dll
...

NOTE:

1. This issue does not happen on neither Windows 8 nor Windows 10 OS
2. There is a work-around way. If users stop the backend process (dotnet.exe) of the aspnetcore app manually before stopping IIS worker process, there is no problem.
3. If you attach debugger such as windbg.exe to the worker process, the exception stack information will be like this.

0:022> g
(a8c.a00): Unknown exception - code c000070a (first chance)
(a8c.a00): Unknown exception - code c000070a (!!! second chance !!!)
ntdll!TppWaiterpThread+0x7f7:
00000000`76dfcf99 448bc3 mov r8d,ebx
0:001> kn

Child-SP RetAddr Call Site

00 0000000000a3f5b0 0000000076b9652d ntdll!TppWaiterpThread+0x7f7 [d:\win7sp1_gdr\minkernel\threadpool\ntdll\waiter.c @ 1397]
01 0000000000a3f850 0000000076dcc541 kernel32!BaseThreadInitThunk+0xd [d:\win7sp1_gdr\base\win32\client\thread.c @ 65]
02 0000000000a3f880 0000000000000000 ntdll!RtlUserThreadStart+0x1d [d:\win7sp1_gdr\minkernel\ntos\rtl\rtlexec.c @ 3203]

Thanks,
Jeong Hwan Kim