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

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Date:   Sat, 20 Aug 2016 23:47:35 -0700
From:   Andy Lutomirski <luto@...capital.net>
To:     kernel test robot <xiaolong.ye@...el.com>
Cc:     Andy Lutomirski <luto@...nel.org>, LKP <lkp@...org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: a81de5e161: BUG: unable to handle kernel paging request at ffffc90000647e38

On Sat, Aug 20, 2016 at 9:13 PM, kernel test robot
<xiaolong.ye@...el.com> 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.