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

commit 7f466032dc9e5a61217f22ea34b2df932786bbfc
Author: Jason Wang <jasowang@redhat.com>
Date: Fri May 24 08:12:18 2019 +0000

vhost: access vq metadata through kernel virtual address

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=149a8a20600000
start commit: 6d21a41b Add linux-next specific files for 20190718
git tree: linux-next
final crash: https://syzkaller.appspot.com/x/report.txt?x=169a8a20600000
console output: https://syzkaller.appspot.com/x/log.txt?x=129a8a20600000
kernel config: https://syzkaller.appspot.com/x/.config?x=3430a151e1452331
dashboard link: https://syzkaller.appspot.com/bug?extid=e58112d71f77113ddb7b
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10139e68600000

Reported-by: syzbot+e58112d71f77113ddb7b@syzkaller.appspotmail.com
Fixes: 7f466032dc9e ("vhost: access vq metadata through kernel virtual
address")

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

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