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SubjectRe: WARNING in ep_poll_callback
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syzbot has bisected this bug to:

commit f92cacf118171208f62519d92502a8dd0341286d
Author: Roman Penyaev <rpenyaev@suse.de>
Date: Tue Jan 8 01:15:44 2019 +0000

epoll: loosen irq safety in ep_poll_callback()

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=107ae15f200000
start commit: f92cacf1 epoll: loosen irq safety in ep_poll_callback()
git tree: linux-next
final crash: https://syzkaller.appspot.com/x/report.txt?x=127ae15f200000
console output: https://syzkaller.appspot.com/x/log.txt?x=147ae15f200000
kernel config: https://syzkaller.appspot.com/x/.config?x=1521b074ff5a5bdf
dashboard link: https://syzkaller.appspot.com/bug?extid=aea82bf9ee6ffd9a79d9
userspace arch: amd64
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1776034b400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14c2e580c00000

Reported-by: syzbot+aea82bf9ee6ffd9a79d9@syzkaller.appspotmail.com
Fixes: f92cacf1 ("epoll: loosen irq safety in ep_poll_callback()")

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