netdev - Re: kernel panic: stack is corrupted in pointer

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Message-ID: <CACT4Y+ZGwKP+f4esJdx60AywO9b3Y5Bxb4zLtH6EEkaHpP6Zag@mail.gmail.com>
Date:   Tue, 23 Jul 2019 09:38:56 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+79f5f028005a77ecb6bb@...kaller.appspotmail.com>,
        John Fastabend <john.fastabend@...il.com>,
        bpf <bpf@...r.kernel.org>
Cc:     David Airlie <airlied@...ux.ie>, alexander.deucher@....com,
        amd-gfx@...ts.freedesktop.org, Alexei Starovoitov <ast@...nel.org>,
        christian.koenig@....com, Daniel Borkmann <daniel@...earbox.net>,
        david1.zhou@....com, DRI <dri-devel@...ts.freedesktop.org>,
        leo.liu@....com, LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: kernel panic: stack is corrupted in pointer

On Wed, Jul 17, 2019 at 10:58 AM syzbot
<syzbot+79f5f028005a77ecb6bb@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    1438cde7 Add linux-next specific files for 20190716
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=13988058600000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3430a151e1452331
> dashboard link: https://syzkaller.appspot.com/bug?extid=79f5f028005a77ecb6bb
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=111fc8afa00000

>From the repro it looks like the same bpf stack overflow bug. +John
We need to dup them onto some canonical report for this bug, or this
becomes unmanageable.

#syz dup: kernel panic: corrupted stack end in dput

> The bug was bisected to:
>
> commit 96a5d8d4915f3e241ebb48d5decdd110ab9c7dcf
> Author: Leo Liu <leo.liu@....com>
> Date:   Fri Jul 13 15:26:28 2018 +0000
>
>      drm/amdgpu: Make sure IB tests flushed after IP resume
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14a46200600000
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=16a46200600000
> console output: https://syzkaller.appspot.com/x/log.txt?x=12a46200600000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+79f5f028005a77ecb6bb@...kaller.appspotmail.com
> Fixes: 96a5d8d4915f ("drm/amdgpu: Make sure IB tests flushed after IP
> resume")
>
> Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in:
> pointer+0x702/0x750 lib/vsprintf.c:2187
> Shutting down cpus with NMI
> Kernel Offset: disabled
>
>
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> syzbot can test patches for this bug, for details see:
> https://goo.gl/tpsmEJ#testing-patches