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SubjectINFO: trying to register non-static key in hci_uart_tty_receive

syzbot found the following crash on:

HEAD commit: ed2393ca Add linux-next specific files for 20190827
git tree: linux-next
console output:
kernel config:
dashboard link:
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:

INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
CPU: 1 PID: 562 Comm: kworker/u4:3 Not tainted 5.3.0-rc6-next-20190827 #74
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: events_unbound flush_to_ldisc
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
assign_lock_key kernel/locking/lockdep.c:881 [inline]
register_lock_class+0x179e/0x1850 kernel/locking/lockdep.c:1190
__lock_acquire+0xf4/0x4a00 kernel/locking/lockdep.c:3837
lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4487
percpu_down_read include/linux/percpu-rwsem.h:40 [inline]
hci_uart_tty_receive+0xcf/0x6e0 drivers/bluetooth/hci_ldisc.c:603
tty_ldisc_receive_buf+0x15f/0x1c0 drivers/tty/tty_buffer.c:465
tty_port_default_receive_buf+0x7d/0xb0 drivers/tty/tty_port.c:38
receive_buf drivers/tty/tty_buffer.c:481 [inline]
flush_to_ldisc+0x222/0x390 drivers/tty/tty_buffer.c:533
process_one_work+0x9af/0x1740 kernel/workqueue.c:2269
worker_thread+0x98/0xe40 kernel/workqueue.c:2415
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

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