linux-kernel - Re: WARNING in submit_bio

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Date:   Wed, 15 Jul 2020 22:00:05 -0700
From:   syzbot <syzbot+4c50ac32e5b10e4133e1@...kaller.appspotmail.com>
To:     andriin@...com, ast@...nel.org, axboe@...nel.dk,
        bkkarthik@...u.pes.edu, bpf@...r.kernel.org, daniel@...earbox.net,
        davem@...emloft.net, ebiggers@...nel.org, hch@...radead.org,
        john.fastabend@...il.com, kafai@...com, kpsingh@...omium.org,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, mcgrof@...nel.org,
        netdev@...r.kernel.org, songliubraving@...com,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk,
        yhs@...com
Subject: Re: WARNING in submit_bio_checks

syzbot has bisected this issue to:

commit 449325b52b7a6208f65ed67d3484fd7b7184477b
Author: Alexei Starovoitov <ast@...nel.org>
Date:   Tue May 22 02:22:29 2018 +0000

    umh: introduce fork_usermode_blob() helper

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10fc4b00900000
start commit:   9e50b94b Add linux-next specific files for 20200703
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=12fc4b00900000
console output: https://syzkaller.appspot.com/x/log.txt?x=14fc4b00900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f99cc0faa1476ed6
dashboard link: https://syzkaller.appspot.com/bug?extid=4c50ac32e5b10e4133e1
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1111fb6d100000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1218fa1f100000

Reported-by: syzbot+4c50ac32e5b10e4133e1@...kaller.appspotmail.com
Fixes: 449325b52b7a ("umh: introduce fork_usermode_blob() helper")

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