linux-kernel - Re: [syzbot] [bridge?] possible deadlock in br_multicast

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Message-ID: <0000000000006ba21a0606bb78f9@google.com>
Date:   Mon, 02 Oct 2023 06:08:29 -0700
From:   syzbot <syzbot+d7b7f1412c02134efa6d@...kaller.appspotmail.com>
To:     amcohen@...dia.com, axboe@...com,
        bridge@...ts.linux-foundation.org, davem@...emloft.net,
        dsahern@...nel.org, edumazet@...gle.com, hch@....de,
        hdanton@...a.com, idosch@...dia.com, ivecera@...hat.com,
        jiri@...nulli.us, kbusch@...nel.org, kuba@...nel.org,
        lengchao@...wei.com, linux-kernel@...r.kernel.org,
        linux-nvme@...ts.infradead.org, llvm@...ts.linux.dev,
        nathan@...nel.org, ndesaulniers@...gle.com, netdev@...r.kernel.org,
        pabeni@...hat.com, razor@...ckwall.org, roopa@...dia.com,
        sagi@...mberg.me, syzkaller-bugs@...glegroups.com, trix@...hat.com
Subject: Re: [syzbot] [bridge?] possible deadlock in br_multicast_rcv (3)

syzbot has bisected this issue to:

commit 0ae3eb7b4611207e140e9772398b9f88b72d6839
Author: Amit Cohen <amcohen@...dia.com>
Date:   Mon Feb 1 19:47:49 2021 +0000

    netdevsim: fib: Perform the route programming in a non-atomic context

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13afdae6680000
start commit:   2faac9a98f01 Merge tag 'keys-fixes-20230321' of git://git...
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=106fdae6680000
console output: https://syzkaller.appspot.com/x/log.txt?x=17afdae6680000
kernel config:  https://syzkaller.appspot.com/x/.config?x=aaa4b45720ca0519
dashboard link: https://syzkaller.appspot.com/bug?extid=d7b7f1412c02134efa6d
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14aea34ec80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13001e91c80000

Reported-by: syzbot+d7b7f1412c02134efa6d@...kaller.appspotmail.com
Fixes: 0ae3eb7b4611 ("netdevsim: fib: Perform the route programming in a non-atomic context")

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