INFO: trying to register non-static key in hci_uart_send_frame (2)

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: f8788d86 Linux 5.6-rc3
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11b3d22de00000
kernel config: https://syzkaller.appspot.com/x/.config?x=9833e26bab355358
dashboard link: https://syzkaller.appspot.com/bug?extid=28071e627252004acc02
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+28071e...@syzkaller.appspotmail.com

INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
CPU: 1 PID: 3061 Comm: kworker/u5:0 Not tainted 5.6.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci1 hci_cmd_work
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x197/0x210 lib/dump_stack.c:118
assign_lock_key kernel/locking/lockdep.c:880 [inline]
register_lock_class+0x179e/0x1850 kernel/locking/lockdep.c:1189
__lock_acquire+0xf4/0x4a00 kernel/locking/lockdep.c:3836
lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484
percpu_down_read include/linux/percpu-rwsem.h:40 [inline]
hci_uart_send_frame+0x85/0x620 drivers/bluetooth/hci_ldisc.c:280
hci_send_frame+0x1bd/0x2d0 net/bluetooth/hci_core.c:3677
hci_cmd_work+0x162/0x2d0 net/bluetooth/hci_core.c:4598
process_one_work+0xa05/0x17a0 kernel/workqueue.c:2264
worker_thread+0x98/0xe40 kernel/workqueue.c:2410
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.