======================================================
WARNING: possible circular locking dependency detected
6.11.0-rc5-syzkaller #0 Not tainted
------------------------------------------------------
kworker/u9:8/5234 is trying to acquire lock:
ffff88806ef82258 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1607 [inline]
ffff88806ef82258 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_conn_ready net/bluetooth/sco.c:1290 [inline]
ffff88806ef82258 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_connect_cfm+0x3ee/0xc10 net/bluetooth/sco.c:1362
but task is already holding lock:
ffff88802cf3ba20 (&conn->lock#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
ffff88802cf3ba20 (&conn->lock#2){+.+.}-{2:2}, at: sco_conn_ready net/bluetooth/sco.c:1277 [inline]
ffff88802cf3ba20 (&conn->lock#2){+.+.}-{2:2}, at: sco_connect_cfm+0x2d1/0xc10 net/bluetooth/sco.c:1362
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&conn->lock#2){+.+.}-{2:2}:
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
sco_chan_add net/bluetooth/sco.c:234 [inline]
sco_connect net/bluetooth/sco.c:287 [inline]
sco_sock_connect+0x39c/0xb00 net/bluetooth/sco.c:596
__sys_connect_file+0x15f/0x1a0 net/socket.c:2061
__sys_connect+0x149/0x170 net/socket.c:2078
__do_sys_connect net/socket.c:2088 [inline]
__se_sys_connect net/socket.c:2085 [inline]
__x64_sys_connect+0x72/0xb0 net/socket.c:2085
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3133 [inline]
check_prevs_add kernel/locking/lockdep.c:3252 [inline]
validate_chain kernel/locking/lockdep.c:3868 [inline]
__lock_acquire+0x24ed/0x3cb0 kernel/locking/lockdep.c:5142
lock_acquire kernel/locking/lockdep.c:5759 [inline]
lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724
lock_sock_nested+0x3a/0xf0 net/core/sock.c:3543
lock_sock include/net/sock.h:1607 [inline]
sco_conn_ready net/bluetooth/sco.c:1290 [inline]
sco_connect_cfm+0x3ee/0xc10 net/bluetooth/sco.c:1362
hci_connect_cfm include/net/bluetooth/hci_core.h:1965 [inline]
hci_sync_conn_complete_evt+0x3a1/0xa10 net/bluetooth/hci_event.c:5009
hci_event_func net/bluetooth/hci_event.c:7446 [inline]
hci_event_packet+0x9eb/0x1180 net/bluetooth/hci_event.c:7498
hci_rx_work+0x2c6/0x1610 net/bluetooth/hci_core.c:4017
process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231
process_scheduled_works kernel/workqueue.c:3312 [inline]
worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
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/u9:8/5234:
#0: ffff88805a230948 ((wq_completion)hci5#2){+.+.}-{0:0}, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3206
#1: ffffc90003237d80 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3207
#2: ffff88807c8e8078 (&hdev->lock){+.+.}-{3:3}, at: hci_sync_conn_complete_evt+0x118/0xa10 net/bluetooth/hci_event.c:4926
#3: ffffffff8fc880e8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1962 [inline]
#3: ffffffff8fc880e8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_sync_conn_complete_evt+0x336/0xa10 net/bluetooth/hci_event.c:5009
#4: ffff88802cf3ba20 (&conn->lock#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
#4: ffff88802cf3ba20 (&conn->lock#2){+.+.}-{2:2}, at: sco_conn_ready net/bluetooth/sco.c:1277 [inline]
#4: ffff88802cf3ba20 (&conn->lock#2){+.+.}-{2:2}, at: sco_connect_cfm+0x2d1/0xc10 net/bluetooth/sco.c:1362
stack backtrace:
CPU: 1 UID: 0 PID: 5234 Comm: kworker/u9:8 Not tainted 6.11.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: hci5 hci_rx_work
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119
check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2186
check_prev_add kernel/locking/lockdep.c:3133 [inline]
check_prevs_add kernel/locking/lockdep.c:3252 [inline]
validate_chain kernel/locking/lockdep.c:3868 [inline]
__lock_acquire+0x24ed/0x3cb0 kernel/locking/lockdep.c:5142
lock_acquire kernel/locking/lockdep.c:5759 [inline]
lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724
lock_sock_nested+0x3a/0xf0 net/core/sock.c:3543
lock_sock include/net/sock.h:1607 [inline]
sco_conn_ready net/bluetooth/sco.c:1290 [inline]
sco_connect_cfm+0x3ee/0xc10 net/bluetooth/sco.c:1362
hci_connect_cfm include/net/bluetooth/hci_core.h:1965 [inline]
hci_sync_conn_complete_evt+0x3a1/0xa10 net/bluetooth/hci_event.c:5009
hci_event_func net/bluetooth/hci_event.c:7446 [inline]
hci_event_packet+0x9eb/0x1180 net/bluetooth/hci_event.c:7498
hci_rx_work+0x2c6/0x1610 net/bluetooth/hci_core.c:4017
process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231
process_scheduled_works kernel/workqueue.c:3312 [inline]
worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
BUG: sleeping function called from invalid context at net/core/sock.c:3545
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5234, name: kworker/u9:8
preempt_count: 1, expected: 0
RCU nest depth: 0, expected: 0
INFO: lockdep is turned off.
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 1 UID: 0 PID: 5234 Comm: kworker/u9:8 Not tainted 6.11.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: hci5 hci_rx_work
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:119
__might_resched+0x3c0/0x5e0 kernel/sched/core.c:8463
lock_sock_nested+0x4b/0xf0 net/core/sock.c:3545
lock_sock include/net/sock.h:1607 [inline]
sco_conn_ready net/bluetooth/sco.c:1290 [inline]
sco_connect_cfm+0x3ee/0xc10 net/bluetooth/sco.c:1362
hci_connect_cfm include/net/bluetooth/hci_core.h:1965 [inline]
hci_sync_conn_complete_evt+0x3a1/0xa10 net/bluetooth/hci_event.c:5009
hci_event_func net/bluetooth/hci_event.c:7446 [inline]
hci_event_packet+0x9eb/0x1180 net/bluetooth/hci_event.c:7498
hci_rx_work+0x2c6/0x1610 net/bluetooth/hci_core.c:4017
process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231
process_scheduled_works kernel/workqueue.c:3312 [inline]
worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Bluetooth: hci5: command tx timeout