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Subject: Re: WARNING in tty_set_termios
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syzbot suspects this bug was fixed by commit:

commit b36a1552d7319bbfd5cf7f08726c23c5c66d4f73
Author: Vladis Dronov <vdronov@redhat.com>
Date:   Tue Jul 30 09:33:45 2019 +0000

     Bluetooth: hci_uart: check for missing tty operations

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10b20aeae00000
start commit:   66c56cfa Merge tag 'remove-dma_zalloc_coherent-5.0' of git..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=b05cfdb4ee8ab9b2
dashboard link: https://syzkaller.appspot.com/bug?extid=a950165cbb86bdd023a4
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=121cee07400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16fdaed8c00000

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

#syz fix: Bluetooth: hci_uart: check for missing tty operations

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