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From:   Ido Schimmel <idosch@mellanox.com>
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Subject: Re: WARNING in bpf_prog_kallsyms_add
Thread-Topic: WARNING in bpf_prog_kallsyms_add
Thread-Index: AQHU4eeJ1m0yzc5n0kio41mHfIAb0KYcRV6A
Date:   Mon, 25 Mar 2019 12:16:38 +0000
Message-ID: <20190325121635.GA10590@splinter>
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+ Dmitry

On Sat, Mar 23, 2019 at 07:16:01PM -0700, syzbot wrote:
> syzbot has bisected this bug to:
>=20
> commit 7607dd35fc34893214284cca740d015154d20452
> Author: Ido Schimmel <idosch@mellanox.com>
> Date:   Mon Jul 17 12:15:30 2017 +0000
>=20
>     mlxsw: spectrum: Trap IPv4 packets with Router Alert option
>=20
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=3D14e0ac0720=
0000
> start commit:   645ff1e8 Merge branch 'for-linus' of git://git.kernel.org=
/..
> git tree:       upstream
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=3D16e0ac0720=
0000
> console output: https://syzkaller.appspot.com/x/log.txt?x=3D12e0ac0720000=
0
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3D20271e14bc1c8=
7f0
> dashboard link: https://syzkaller.appspot.com/bug?extid=3D987e48d84abddbe=
2506d
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=3D13c69d20c00=
000
>=20
> Reported-by: syzbot+987e48d84abddbe2506d@syzkaller.appspotmail.com
> Fixes: 7607dd35fc34 ("mlxsw: spectrum: Trap IPv4 packets with Router Aler=
t
> option")
>=20
> For information about bisection process see: https://goo.gl/tpsmEJ#bisect=
ion

Dmitry,

The bisection is probably wrong. Above mentioned commit is specific to
mlxsw which is not even present in the provided kernel config.

I see that this also appears in the web interface [1] which might be
misleading to some people. Might be worthwhile to add a command for
syzbot that tells it that bisection is wrong?

[1] https://syzkaller.appspot.com/bug?id=3Db658eb696c8279d9951a4ceea79efba8=
a1d12467