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SubjectRe: possible deadlock in send_sigio (2)
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syzbot has bisected this issue to:

commit e918188611f073063415f40fae568fa4d86d9044
Author: Boqun Feng <boqun.feng@gmail.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@syzkaller.appspotmail.com
Fixes: e918188611f0 ("locking: More accurate annotations for read_lock()")

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

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