[issue36856] faulthandler._stack_overflow doesn't work on x86-linux with KPTI enabled

[Xi Ruoyao]

Xi Ruoyao <xry111 at mengyan1223.wang> added the comment:

> Are uintptr_t overflow/underflow semantics a defined behavior?

Yes.  Unlike signed overflow, unsigned overflow is defined to be 2's complement.  The problem is this overflow results a wrong stack pointer limit and breaks _stack_overflow.

----------

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36856>
_______________________________________