Re: general protection fault in p9_conn_cancel

syzbot suspects this bug was fixed by commit:

commit 9f476d7c540cb57556d3cc7e78704e6cd5100f5f
Author: Tomas Bortoli [off-list ref]
Date:   Mon Jul 23 18:42:53 2018 +0000

     net/9p/trans_fd.c: fix race by holding the lock

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1150b430600000
start commit:   30c2c32d Merge tag 'drm-fixes-2018-07-10' of git://anongit..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=25856fac4e580aa7
dashboard link: https://syzkaller.appspot.com/bug?extid=4d29d76a0da7a8c4d86c
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10e2c5b2400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=179415b2400000

If the result looks correct, please mark the bug fixed by replying with:

#syz fix: net/9p/trans_fd.c: fix race by holding the lock

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