Winodws Standalone Crash at Close

I'm having a problem where our application seems to crash when closed (I attached a picture of the crash). It seems to be related to a native C++ dll that we're loading (CEF). The error log shows the file crash trace:

Spoiler: Stack Trace

========== OUTPUTING STACK TRACE ==================

ERROR: SymGetSymFromAddr64, GetLastError: 'The specified module could not be found.' (Address: 10A80CD0)
ERROR: SymGetModuleInfo64, GetLastError: 'A dynamic link library (DLL) initialization routine failed.' (Address: 10A80CD0)
0x10A80CD0 ((<unknown>))
0x1282E581 (libcef) cef_string_map_value
ERROR: SymGetSymFromAddr64, GetLastError: 'The specified module could not be found.' (Address: 0508FCC8)
ERROR: SymGetModuleInfo64, GetLastError: 'A dynamic link library (DLL) initialization routine failed.' (Address: 0508FCC8)
0x0508FCC8 ((<unknown>))
ERROR: SymGetSymFromAddr64, GetLastError: 'The specified module could not be found.' (Address: 050E8735)
ERROR: SymGetModuleInfo64, GetLastError: 'A dynamic link library (DLL) initialization routine failed.' (Address: 050E8735)
0x050E8735 ((<unknown>))
ERROR: SymGetSymFromAddr64, GetLastError: 'The specified module could not be found.' (Address: 050E8675)
ERROR: SymGetModuleInfo64, GetLastError: 'A dynamic link library (DLL) initialization routine failed.' (Address: 050E8675)
0x050E8675 ((<unknown>))
ERROR: SymGetSymFromAddr64, GetLastError: 'The specified module could not be found.' (Address: 050E8626)
ERROR: SymGetModuleInfo64, GetLastError: 'A dynamic link library (DLL) initialization routine failed.' (Address: 050E8626)
0x050E8626 ((<unknown>))
ERROR: SymGetSymFromAddr64, GetLastError: 'The specified module could not be found.' (Address: 05071CC7)
ERROR: SymGetModuleInfo64, GetLastError: 'A dynamic link library (DLL) initialization routine failed.' (Address: 05071CC7)
0x05071CC7 ((<unknown>))
0x1002B6F3 (mono) mono_gc_is_finalizer_thread
0x1002B8A9 (mono) mono_gc_is_finalizer_thread
0x1002B978 (mono) mono_gc_is_finalizer_thread
0x1010C38E (mono) unity_mono_method_is_generic
0x772338F4 (KERNEL32) BaseThreadInitThunk
0x77655DE3 (ntdll) RtlUnicodeStringToInteger

========== END OF STACKTRACE ===========

Looking at the error.log yields the following:

Spoiler: error.log

Unity Player [version: Unity 5.3.4f1_fdbb5133b820]

Unknown caused an Access Violation (0xc0000005)
in module Unknown at 0023:10a80cd0.

Error occurred at 2016-05-03_173636.
C:\app\Demo.exe
46% memory in use.
0 MB physical memory [0 MB free].
0 MB paging file [0 MB free].
0 MB user address space [3586 MB free].
Write to location 00ce53d0 caused an access violation.

Is this type of error systematic of something? CEF does run on another thread and I shut that down on the application quit. I cancel the quit in OnApplicationQuit and wait 5 seconds after the thread and CEF shutdown and I still get the crash.

Thanks for the help!

 

In case anyone else is having a similar issue, I was able to solve this. Turns out it was a garbage collection issue with one of the C++ wrappers in the library. I had the debug symbols for the dll (pdb) and hooked that up to Visual Studio and found where it was crashing. I already had assumed it was a garbage collection issue from the "mono_gc_is_finalizer_thread" in the error trace, so the debug symbols lead me to the dispose of a class that was getting collected at the wrong time.