Bluetooth: hci0: link tx timeout
Bluetooth: hci0: killing stalled connection 10:aa:aa:aa:aa:aa
BUG: sleeping function called from invalid context at kernel/locking/mutex.c:580
in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 3556, name: kworker/u5:2
preempt_count: 0, expected: 0
RCU nest depth: 1, expected: 0
3 locks held by kworker/u5:2/3556:
 #0: ffff88807a7f1138 ((wq_completion)hci0#2){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
 #1: ffffc90003abfd20 ((work_completion)(&hdev->tx_work)){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
 #2: ffffffff8d12ac80 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #2: ffffffff8d12ac80 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #2: ffffffff8d12ac80 (rcu_read_lock){....}-{1:2}, at: hci_link_tx_to net/bluetooth/hci_core.c:3448 [inline]
 #2: ffffffff8d12ac80 (rcu_read_lock){....}-{1:2}, at: __check_timeout+0x181/0x460 net/bluetooth/hci_core.c:3601
CPU: 0 PID: 3556 Comm: kworker/u5:2 Not tainted 6.1.87-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: hci0 hci_tx_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 __might_resched+0x5cb/0x780 kernel/sched/core.c:9942
 __mutex_lock_common kernel/locking/mutex.c:580 [inline]
 __mutex_lock+0xbd/0xd80 kernel/locking/mutex.c:747
 hci_cmd_sync_submit+0x3b/0x2e0 net/bluetooth/hci_sync.c:702
 hci_disconnect+0xe6/0x2c0 net/bluetooth/hci_conn.c:255
 hci_link_tx_to net/bluetooth/hci_core.c:3455 [inline]
 __check_timeout+0x333/0x460 net/bluetooth/hci_core.c:3601
 hci_sched_acl_pkt net/bluetooth/hci_core.c:3659 [inline]
 hci_sched_acl net/bluetooth/hci_core.c:3762 [inline]
 hci_tx_work+0xce2/0x1ec0 net/bluetooth/hci_core.c:3861
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>

=============================
[ BUG: Invalid wait context ]
6.1.87-syzkaller #0 Tainted: G        W         
-----------------------------
kworker/u5:2/3556 is trying to lock:
ffff8880763e09b0 (&hdev->unregister_lock){+.+.}-{3:3}, at: hci_cmd_sync_submit+0x3b/0x2e0 net/bluetooth/hci_sync.c:702
other info that might help us debug this:
context-{4:4}
3 locks held by kworker/u5:2/3556:
 #0: ffff88807a7f1138 ((wq_completion)hci0#2){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
 #1: ffffc90003abfd20 ((work_completion)(&hdev->tx_work)){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
 #2: ffffffff8d12ac80 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #2: ffffffff8d12ac80 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #2: ffffffff8d12ac80 (rcu_read_lock){....}-{1:2}, at: hci_link_tx_to net/bluetooth/hci_core.c:3448 [inline]
 #2: ffffffff8d12ac80 (rcu_read_lock){....}-{1:2}, at: __check_timeout+0x181/0x460 net/bluetooth/hci_core.c:3601
stack backtrace:
CPU: 0 PID: 3556 Comm: kworker/u5:2 Tainted: G        W          6.1.87-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: hci0 hci_tx_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_lock_invalid_wait_context kernel/locking/lockdep.c:4701 [inline]
 check_wait_context kernel/locking/lockdep.c:4762 [inline]
 __lock_acquire+0x14b1/0x1f80 kernel/locking/lockdep.c:4999
 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
 __mutex_lock_common kernel/locking/mutex.c:603 [inline]
 __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747
 hci_cmd_sync_submit+0x3b/0x2e0 net/bluetooth/hci_sync.c:702
 hci_disconnect+0xe6/0x2c0 net/bluetooth/hci_conn.c:255
 hci_link_tx_to net/bluetooth/hci_core.c:3455 [inline]
 __check_timeout+0x333/0x460 net/bluetooth/hci_core.c:3601
 hci_sched_acl_pkt net/bluetooth/hci_core.c:3659 [inline]
 hci_sched_acl net/bluetooth/hci_core.c:3762 [inline]
 hci_tx_work+0xce2/0x1ec0 net/bluetooth/hci_core.c:3861
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
Bluetooth: hci0: link tx timeout
Bluetooth: hci0: killing stalled connection 11:aa:aa:aa:aa:aa
Bluetooth: hci0: command 0x0406 tx timeout