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From:   Dmitry Vyukov <dvyukov@google.com>
Date:   Wed, 12 Oct 2022 15:54:59 +0200
Message-ID: <CACT4Y+Z4CCBqyNJCNySYEWUFT-GOfEjYguBfUh_nb6aAe1w99Q@mail.gmail.com>
Subject: Re: [syzbot] kernel panic: kernel stack overflow
To:     Jiri Pirko <jiri@resnulli.us>
Cc:     syzbot <syzbot+60748c96cf5c6df8e581@syzkaller.appspotmail.com>,
        davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
        linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
        pabeni@redhat.com, syzkaller-bugs@googlegroups.com
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On Wed, 12 Oct 2022 at 15:11, Jiri Pirko <jiri@resnulli.us> wrote:
>
> Wed, Oct 12, 2022 at 09:53:27AM CEST, dvyukov@google.com wrote:
> >On Wed, 12 Oct 2022 at 09:48, syzbot
> ><syzbot+60748c96cf5c6df8e581@syzkaller.appspotmail.com> wrote:
> >>
> >> Hello,
> >>
> >> syzbot found the following issue on:
> >>
> >> HEAD commit:    bbed346d5a96 Merge branch 'for-next/core' into for-kernelci
> >> git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
> >> console output: https://syzkaller.appspot.com/x/log.txt?x=14a03a2a880000
> >> kernel config:  https://syzkaller.appspot.com/x/.config?x=aae2d21e7dd80684
> >> dashboard link: https://syzkaller.appspot.com/bug?extid=60748c96cf5c6df8e581
> >> compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
> >> userspace arch: arm64
> >>
> >> Unfortunately, I don't have any reproducer for this issue yet.
> >>
> >> Downloadable assets:
> >> disk image: https://storage.googleapis.com/syzbot-assets/11078f50b80b/disk-bbed346d.raw.xz
> >> vmlinux: https://storage.googleapis.com/syzbot-assets/398e5f1e6c84/vmlinux-bbed346d.xz
> >>
> >> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> >> Reported-by: syzbot+60748c96cf5c6df8e581@syzkaller.appspotmail.com
> >
> >+Jiri
> >
> >It looks like the issue is with the team device. It seems to call
> >itself infinitely.
> >team_device_event was mentioned in stack overflow bugs in the past:
> >https://groups.google.com/g/syzkaller-bugs/search?q=%22team_device_event%22
>
> Hi, do you have dmesg output available by any chance?

Hi Jiri,

syzbot attaches dmesg output to every report under the "console output" link.