linux-kernel - Re: [syzbot] [net?] KMSAN: uninit-value in __netif_receive_skb

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Message-ID: <000000000000b566c50600f1c206@google.com>
Date:   Thu, 20 Jul 2023 14:23:33 -0700
From:   syzbot <syzbot+b202b7208664142954fa@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, alaaemadhossney.ae@...il.com,
        ast@...nel.org, bp@...en8.de, bpoirier@...e.com,
        daniel@...earbox.net, dave.hansen@...ux.intel.com,
        davem@...emloft.net, dvyukov@...gle.com, edumazet@...gle.com,
        elena.reshetova@...el.com, glider@...gle.com, hpa@...or.com,
        ishkamiel@...il.com, keescook@...omium.org, kuba@...nel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        makita.toshiaki@....ntt.co.jp, maloney@...gle.com,
        mingo@...hat.com, netdev@...r.kernel.org, rami.rosen@...el.com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        tonymarislogistics@...dex.com, willemb@...gle.com, x86@...nel.org
Subject: Re: [syzbot] [net?] KMSAN: uninit-value in __netif_receive_skb_core

syzbot has bisected this issue to:

commit e420bed025071a623d2720a92bc2245c84757ecb
Author: Daniel Borkmann <daniel@...earbox.net>
Date:   Wed Jul 19 14:08:52 2023 +0000

    bpf: Add fd-based tcx multi-prog infra with link support

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13dfaae6a80000
start commit:   03b123debcbc tcp: tcp_enter_quickack_mode() should be static
git tree:       net-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=103faae6a80000
console output: https://syzkaller.appspot.com/x/log.txt?x=17dfaae6a80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=32e3dcc11fd0d297
dashboard link: https://syzkaller.appspot.com/bug?extid=b202b7208664142954fa
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15cc32e6a80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16aace14a80000

Reported-by: syzbot+b202b7208664142954fa@...kaller.appspotmail.com
Fixes: e420bed02507 ("bpf: Add fd-based tcx multi-prog infra with link support")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection