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SubjectRe: general protection fault in put_pid
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syzbot has bisected this bug to:

commit b9b8a41adeff5666b402996020b698504c927353
Author: Dan Carpenter <dan.carpenter@oracle.com>
Date: Mon Aug 20 08:25:33 2018 +0000

btrfs: use after free in btrfs_quota_enable

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14155a1f200000
start commit: f5d58277 Merge branch 'for-linus' of git://git.kernel.org/..
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=16155a1f200000
console output: https://syzkaller.appspot.com/x/log.txt?x=12155a1f200000
kernel config: https://syzkaller.appspot.com/x/.config?x=c8970c89a0efbb23
dashboard link: https://syzkaller.appspot.com/bug?extid=1145ec2e23165570c3ac
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16803afb400000

Reported-by: syzbot+1145ec2e23165570c3ac@syzkaller.appspotmail.com
Fixes: b9b8a41adeff ("btrfs: use after free in btrfs_quota_enable")

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

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