Re: WARNING in dlfb_submit_urb/usb_submit_urb

[syzbot]

syzbot has bisected this bug to:

commit c61769bd4777a922952aed0d042a2572e5bd9b74
Author: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Date:   Thu May 7 17:06:57 2020 +0000

    usb: raw-gadget: support stalling/halting/wedging endpoints

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14add53c100000
start commit:   051143e1 Merge tag 'apparmor-pr-2020-05-21' of git://git.k..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=16add53c100000
console output: https://syzkaller.appspot.com/x/log.txt?x=12add53c100000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b3368ce0cc5f5ace
dashboard link: https://syzkaller.appspot.com/bug?extid=53ce4a4246d0fe0fee34
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15be3ad6100000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1559676e100000

Reported-by: syzbot+53ce4a4246d0fe0fee34@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: c61769bd4777 ("usb: raw-gadget: support stalling/halting/wedging endpoints")

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