[issue36736] Python crashes when calling win32file.LockFileEx

[Anand Arumugam]

Anand Arumugam <anand.arumug at gmail.com> added the comment:

Here's the crash call stack:

Debug session time: Fri Apr 26 14:39:04.000 2019 (UTC - 7:00)
System Uptime: 3 days 12:26:46.641
Process Uptime: 0 days 0:02:27.000
...............................................
This dump file has an exception of interest stored in it.
The stored exception information can be accessed via .ecxr.
(70a8.52a0): Access violation - code c0000005 (first/second chance not available)
For analysis of this file, run !analyze -v
ntdll!ZwWaitForMultipleObjects+0x14:
00007ffc`c67cf114 c3              ret
0:000> kc
 # Call Site
00 ntdll!ZwWaitForMultipleObjects
01 KERNELBASE!WaitForMultipleObjectsEx
02 KERNELBASE!WaitForMultipleObjects
03 kernel32!WerpReportFaultInternal
04 kernel32!WerpReportFault
05 KERNELBASE!UnhandledExceptionFilter
06 ntdll!RtlpThreadExceptionFilter
07 ntdll!RtlUserThreadStart$filt$0
08 ntdll!__C_specific_handler
09 ntdll!RtlpExecuteHandlerForException
0a ntdll!RtlDispatchException
0b ntdll!KiUserExceptionDispatch
*** WARNING: Unable to verify checksum for win32file.pyd
0c KERNELBASE!LockFileEx
0d win32file
0e python37!_PyMethodDef_RawFastCallKeywords
0f python37!_PyCFunction_FastCallKeywords
10 python37!call_function
11 python37!_PyEval_EvalFrameDefault
12 python37!PyEval_EvalFrameEx
13 python37!_PyEval_EvalCodeWithName
14 python37!PyEval_EvalCodeEx
15 python37!PyEval_EvalCode
16 python37!run_mod
17 python37!PyRun_InteractiveOneObjectEx
18 python37!PyRun_InteractiveLoopFlags
19 python37!PyRun_AnyFileExFlags
1a python37!pymain_run_file
1b python37!pymain_run_filename
1c python37!pymain_run_python
1d python37!pymain_main
1e python37!Py_Main
1f python!invoke_main
20 python!__scrt_common_main_seh
21 kernel32!BaseThreadInitThunk
22 ntdll!RtlUserThreadStart

----------

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36736>
_______________________________________