Re: a81de5e161: BUG: unable to handle kernel paging request at ffffc90000647e38

[Andy Lutomirski]

On Sat, Aug 20, 2016 at 9:13 PM, kernel test robot
<xiaolong.ye@xxxxxxxxx> wrote:
>
> FYI, we noticed the following commit:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/vmap_stack
> commit a81de5e16134480cc93596945601f19e1ace7723 ("[DEBUG] forcibly free stacks immediately")
>
> in testcase: boot
>
> on test machine: qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap -smp 2 -m 1G
>
> caused below changes:
>

> [   22.412266]  [<ffffffff8129eeed>] do_task_stat+0x3cb/0x93d

To anyone watching this, I found and fixed the bug.  And Ingo, if
you're watching, this bug is not present in the set of patches I
emailed you a few days ago.