Re: [lkp-robot] [mm] 1be7107fbe: kernel_BUG_at_mm/mmap.c

From: Linus Torvalds
Date: Wed Jun 21 2017 - 16:30:34 EST

On Wed, Jun 21, 2017 at 1:27 PM, Oleg Nesterov <oleg@xxxxxxxxxx> wrote:
> Now __do_page_fault() tries to expand the stack itself, and this check
> fails.

But we want that check to trigger and cause the access to fail.
Accessing the stack below the stack pointer is wrong.

Do you have a pointer to the report for this regression? I must have missed it.