linux-kernel - Re: possible deadlock in send

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Message-ID: <0000000000001560ee05b3568521@google.com>
Date:   Wed, 04 Nov 2020 22:51:04 -0800
From:   syzbot <syzbot+907b8537e3b0e55151fc@...kaller.appspotmail.com>
To:     bfields@...ldses.org, boqun.feng@...il.com, jlayton@...nel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        mingo@...hat.com, peterz@...radead.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk,
        will@...nel.org
Subject: Re: possible deadlock in send_sigio (2)

syzbot has bisected this issue to:

commit e918188611f073063415f40fae568fa4d86d9044
Author: Boqun Feng <boqun.feng@...il.com>
Date:   Fri Aug 7 07:42:20 2020 +0000

    locking: More accurate annotations for read_lock()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15fbef32500000
start commit:   4ef8451b Merge tag 'perf-tools-for-v5.10-2020-11-03' of gi..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=17fbef32500000
console output: https://syzkaller.appspot.com/x/log.txt?x=13fbef32500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4e93228e2f17fb12
dashboard link: https://syzkaller.appspot.com/bug?extid=907b8537e3b0e55151fc
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=160ab4b2500000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12cb8e2a500000

Reported-by: syzbot+907b8537e3b0e55151fc@...kaller.appspotmail.com
Fixes: e918188611f0 ("locking: More accurate annotations for read_lock()")

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