Eryk Sun added the comment:
You may have uncovered a bug in Python that's causing the invalid parameter
handler to be invoked. It would help if you uploaded the zipped dump file for
the crashed process.
The status code you're getting (i.e. STATUS_STACK_BUFFER_OVERRUN, 0xC0000409)
is used by the __fastfail intrinsic [1]. The exception occurred in ucrtbase.dll
at offset 0x6d5b8. In a debugger you can see it's in the CRT's invoke_watson
function:
0:000> u ucrtbase + 0x6d5b8 - 0x18 L7
ucrtbase!invoke_watson:
00007ffd`8984d5a0 4883ec28 sub rsp,28h
00007ffd`8984d5a4 b917000000 mov ecx,17h
00007ffd`8984d5a9 ff1531310400 call qword ptr
[ucrtbase!_imp_IsProcessorFeaturePresent (00007ffd`898906e0)]
00007ffd`8984d5af 85c0 test eax,eax
00007ffd`8984d5b1 7407 je ucrtbase!invoke_watson+0x1a
(00007ffd`8984d5ba)
00007ffd`8984d5b3 b905000000 mov ecx,5
00007ffd`8984d5b8 cd29 int 29h
A fast fail executes an int 29h software interrupt, which gets handled by the
following system function:
lkd> !idt 0x29
Dumping IDT: fffff801819a8070
29: fffff8017fd66680 nt!KiRaiseSecurityCheckFailure
In this case the CRT passes a value of 5 (FAST_FAIL_INVALID_ARG) in register
rcx (ecx), so it's not a critical security failure.
[1]: https://msdn.microsoft.com/en-us/library/dn774154.aspx
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