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SubjectRe: KASAN: use-after-free Read in blkdev_direct_IO
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syzbot has bisected this bug to:

commit b9a1e627405d68d475a3c1f35e685ccfb5bbe668
Author: Cong Wang <xiyou.wangcong@gmail.com>
Date: Thu Jul 4 00:21:13 2019 +0000

hsr: implement dellink to clean up resources

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1589f3e8600000
start commit: 1e78030e Merge tag 'mmc-v5.3-rc1' of git://git.kernel.org/..
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=1789f3e8600000
console output: https://syzkaller.appspot.com/x/log.txt?x=1389f3e8600000
kernel config: https://syzkaller.appspot.com/x/.config?x=4c7b914a2680c9c6
dashboard link: https://syzkaller.appspot.com/bug?extid=0a0e5f37746013dc7476
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11fa7830600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12f31c8a600000

Reported-by: syzbot+0a0e5f37746013dc7476@syzkaller.appspotmail.com
Fixes: b9a1e627405d ("hsr: implement dellink to clean up resources")

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

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