======================================================
WARNING: possible circular locking dependency detected
6.1.100-syzkaller #0 Not tainted
------------------------------------------------------
kworker/u5:4/3559 is trying to acquire lock:
ffff88805fb4c130 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1748 [inline]
ffff88805fb4c130 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_conn_ready net/bluetooth/sco.c:1291 [inline]
ffff88805fb4c130 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_connect_cfm+0x450/0xb10 net/bluetooth/sco.c:1363
but task is already holding lock:
ffff888073d38220 (&conn->lock#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
ffff888073d38220 (&conn->lock#2){+.+.}-{2:2}, at: sco_conn_ready net/bluetooth/sco.c:1278 [inline]
ffff888073d38220 (&conn->lock#2){+.+.}-{2:2}, at: sco_connect_cfm+0x279/0xb10 net/bluetooth/sco.c:1363
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&conn->lock#2){+.+.}-{2:2}:
lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
sco_chan_del+0x64/0x1d0 net/bluetooth/sco.c:167
sco_sock_shutdown+0x160/0x3d0 net/bluetooth/sco.c:1226
__sys_shutdown_sock net/socket.c:2355 [inline]
__sys_shutdown net/socket.c:2367 [inline]
__do_sys_shutdown net/socket.c:2375 [inline]
__se_sys_shutdown+0x147/0x1a0 net/socket.c:2373
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> #0 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3090 [inline]
check_prevs_add kernel/locking/lockdep.c:3209 [inline]
validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825
__lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
lock_sock_nested+0x44/0x100 net/core/sock.c:3485
lock_sock include/net/sock.h:1748 [inline]
sco_conn_ready net/bluetooth/sco.c:1291 [inline]
sco_connect_cfm+0x450/0xb10 net/bluetooth/sco.c:1363
hci_connect_cfm include/net/bluetooth/hci_core.h:1793 [inline]
hci_sync_conn_complete_evt+0x54b/0xac0 net/bluetooth/hci_event.c:5107
hci_event_func net/bluetooth/hci_event.c:7539 [inline]
hci_event_packet+0xa9d/0x1510 net/bluetooth/hci_event.c:7591
hci_rx_work+0x3cd/0xce0 net/bluetooth/hci_core.c:4129
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:295
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&conn->lock#2);
lock(sk_lock-AF_BLUETOOTH-BTPROTO_SCO);
lock(&conn->lock#2);
lock(sk_lock-AF_BLUETOOTH-BTPROTO_SCO);
*** DEADLOCK ***
5 locks held by kworker/u5:4/3559:
#0: ffff8880296b5938 ((wq_completion)hci0#2){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#1: ffffc9000461fd20 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#2: ffff888072d24078 (&hdev->lock){+.+.}-{3:3}, at: hci_sync_conn_complete_evt+0xaa/0xac0 net/bluetooth/hci_event.c:5021
#3: ffffffff8e3f0f48 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1790 [inline]
#3: ffffffff8e3f0f48 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_sync_conn_complete_evt+0x4d5/0xac0 net/bluetooth/hci_event.c:5107
#4: ffff888073d38220 (&conn->lock#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
#4: ffff888073d38220 (&conn->lock#2){+.+.}-{2:2}, at: sco_conn_ready net/bluetooth/sco.c:1278 [inline]
#4: ffff888073d38220 (&conn->lock#2){+.+.}-{2:2}, at: sco_connect_cfm+0x279/0xb10 net/bluetooth/sco.c:1363
stack backtrace:
CPU: 1 PID: 3559 Comm: kworker/u5:4 Not tainted 6.1.100-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Workqueue: hci0 hci_rx_work
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
check_noncircular+0x2fa/0x3b0 kernel/locking/lockdep.c:2170
check_prev_add kernel/locking/lockdep.c:3090 [inline]
check_prevs_add kernel/locking/lockdep.c:3209 [inline]
validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825
__lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
lock_sock_nested+0x44/0x100 net/core/sock.c:3485
lock_sock include/net/sock.h:1748 [inline]
sco_conn_ready net/bluetooth/sco.c:1291 [inline]
sco_connect_cfm+0x450/0xb10 net/bluetooth/sco.c:1363
hci_connect_cfm include/net/bluetooth/hci_core.h:1793 [inline]
hci_sync_conn_complete_evt+0x54b/0xac0 net/bluetooth/hci_event.c:5107
hci_event_func net/bluetooth/hci_event.c:7539 [inline]
hci_event_packet+0xa9d/0x1510 net/bluetooth/hci_event.c:7591
hci_rx_work+0x3cd/0xce0 net/bluetooth/hci_core.c:4129
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:295
</TASK>
BUG: sleeping function called from invalid context at net/core/sock.c:3487
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3559, name: kworker/u5:4
preempt_count: 1, expected: 0
RCU nest depth: 0, expected: 0
INFO: lockdep is turned off.
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 1 PID: 3559 Comm: kworker/u5:4 Not tainted 6.1.100-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Workqueue: hci0 hci_rx_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:9945
lock_sock_nested+0x59/0x100 net/core/sock.c:3487
lock_sock include/net/sock.h:1748 [inline]
sco_conn_ready net/bluetooth/sco.c:1291 [inline]
sco_connect_cfm+0x450/0xb10 net/bluetooth/sco.c:1363
hci_connect_cfm include/net/bluetooth/hci_core.h:1793 [inline]
hci_sync_conn_complete_evt+0x54b/0xac0 net/bluetooth/hci_event.c:5107
hci_event_func net/bluetooth/hci_event.c:7539 [inline]
hci_event_packet+0xa9d/0x1510 net/bluetooth/hci_event.c:7591
hci_rx_work+0x3cd/0xce0 net/bluetooth/hci_core.c:4129
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:295
</TASK>
Bluetooth: hci0: link tx timeout
Bluetooth: hci0: killing stalled connection 11:aa:aa:aa:aa:aa