Re: [syzbot] [serial?] possible deadlock in tty_buffer_flush (3)

[syzbot]

syzbot has bisected this issue to:

commit a3c06ae158dd6fa8336157c31d9234689d068d02
Author: Parav Pandit <parav@xxxxxxxxxx>
Date:   Tue Jan 5 10:32:03 2021 +0000

    vdpa_sim_net: Add support for user supported devices

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=101452b0580000
start commit:   595523945be0 Merge tag 'devicetree-fixes-for-6.13-2' of gi..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=121452b0580000
console output: https://syzkaller.appspot.com/x/log.txt?x=141452b0580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d1cb4a1f148c0861
dashboard link: https://syzkaller.appspot.com/bug?extid=52cf91760dcb1dac6376
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=164091f8580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17903fc4580000

Reported-by: syzbot+52cf91760dcb1dac6376@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: a3c06ae158dd ("vdpa_sim_net: Add support for user supported devices")

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