[Linux-cachefs] [syzbot] general protection fault in __io_arm_poll_handler

[syzbot]

syzbot has bisected this issue to:

commit 884a76881fc5f5c9c04de1b640bed2c340929842
Author: David Howells <dhowells at redhat.com>
Date:   Mon Feb 10 10:00:22 2020 +0000

    fscache: Procfile to display cookies

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=114e665d300000
start commit:   a9c9a6f741cd Merge tag 'scsi-misc' of git://git.kernel.org..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=134e665d300000
console output: https://syzkaller.appspot.com/x/log.txt?x=154e665d300000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c84ed2c3f57ace
dashboard link: https://syzkaller.appspot.com/bug?extid=ba74b85fa15fd7a96437
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=137a45a3300000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=105ba169300000

Reported-by: syzbot+ba74b85fa15fd7a96437 at syzkaller.appspotmail.com
Fixes: 884a76881fc5 ("fscache: Procfile to display cookies")

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