====================================================== WARNING: possible circular locking dependency detected 6.1.84-syzkaller #0 Not tainted ------------------------------------------------------ kworker/0:11/3795 is trying to acquire lock: ffff8880567ed130 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1745 [inline] ffff8880567ed130 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_sock_timeout+0xbd/0x230 net/bluetooth/sco.c:97 but task is already holding lock: ffffc900057cfd20 ((work_completion)(&(&conn->timeout_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 ((work_completion)(&(&conn->timeout_work)->work)){+.+.}-{0:0}: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __flush_work+0xfe/0xad0 kernel/workqueue.c:3072 __cancel_work_timer+0x519/0x6a0 kernel/workqueue.c:3163 sco_conn_del+0x205/0x300 net/bluetooth/sco.c:205 hci_disconn_cfm include/net/bluetooth/hci_core.h:1808 [inline] hci_conn_hash_flush+0x10e/0x2a0 net/bluetooth/hci_conn.c:2441 hci_dev_close_sync+0x9a9/0x1020 net/bluetooth/hci_sync.c:5015 hci_dev_do_close net/bluetooth/hci_core.c:554 [inline] hci_error_reset+0x12c/0x3c0 net/bluetooth/hci_core.c:1060 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:307 -> #2 (hci_cb_list_lock){+.+.}-{3:3}: 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_connect_cfm include/net/bluetooth/hci_core.h:1790 [inline] hci_remote_features_evt+0x664/0xab0 net/bluetooth/hci_event.c:3778 hci_event_func net/bluetooth/hci_event.c:7514 [inline] hci_event_packet+0xa9d/0x1510 net/bluetooth/hci_event.c:7566 hci_rx_work+0x3cd/0xce0 net/bluetooth/hci_core.c:4130 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:307 -> #1 (&hdev->lock){+.+.}-{3:3}: 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 sco_sock_connect+0x181/0x8f0 net/bluetooth/sco.c:593 __sys_connect_file net/socket.c:2006 [inline] __sys_connect+0x2c9/0x300 net/socket.c:2023 __do_sys_connect net/socket.c:2033 [inline] __se_sys_connect net/socket.c:2030 [inline] __x64_sys_connect+0x76/0x80 net/socket.c:2030 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #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:3484 lock_sock include/net/sock.h:1745 [inline] sco_sock_timeout+0xbd/0x230 net/bluetooth/sco.c:97 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:307 other info that might help us debug this: Chain exists of: sk_lock-AF_BLUETOOTH-BTPROTO_SCO --> hci_cb_list_lock --> (work_completion)(&(&conn->timeout_work)->work) Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock((work_completion)(&(&conn->timeout_work)->work)); lock(hci_cb_list_lock); lock((work_completion)(&(&conn->timeout_work)->work)); lock(sk_lock-AF_BLUETOOTH-BTPROTO_SCO); *** DEADLOCK *** 2 locks held by kworker/0:11/3795: #0: ffff888012470938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267 #1: ffffc900057cfd20 ((work_completion)(&(&conn->timeout_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267 stack backtrace: CPU: 0 PID: 3795 Comm: kworker/0:11 Not tainted 6.1.84-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: events sco_sock_timeout Call Trace: __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:3484 lock_sock include/net/sock.h:1745 [inline] sco_sock_timeout+0xbd/0x230 net/bluetooth/sco.c:97 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:307 IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready usb 2-1: new high-speed USB device number 11 using dummy_hcd usb 2-1: Using ep0 maxpacket: 16 usb 2-1: config 0 has an invalid descriptor of length 0, skipping remainder of the config usb 2-1: config 0 interface 0 altsetting 0 endpoint 0x82 has an invalid bInterval 0, changing to 7 usb 2-1: config 0 interface 0 altsetting 0 endpoint 0x2 has invalid wMaxPacketSize 0 usb 2-1: config 0 interface 0 altsetting 0 bulk endpoint 0x2 has invalid maxpacket 0 usb 2-1: config 0 interface 0 altsetting 0 has 2 endpoint descriptors, different from the interface descriptor's value: 3 usb 2-1: New USB device found, idVendor=2040, idProduct=b138, bcdDevice= 1.42 usb 2-1: New USB device strings: Mfr=4, Product=0, SerialNumber=0 usb 2-1: Manufacturer: syz usb 2-1: config 0 descriptor?? rc_core: IR keymap rc-hauppauge not found Registered IR keymap rc-empty mceusb 2-1:0.0: Error: mce write submit urb error = -90 mceusb 2-1:0.0: Error: mce write submit urb error = -90 rc rc0: Conexant Hybrid TV (cx231xx) MCE IR no TX (2040:b138) as /devices/platform/dummy_hcd.1/usb2/2-1/2-1:0.0/rc/rc0 input: Conexant Hybrid TV (cx231xx) MCE IR no TX (2040:b138) as /devices/platform/dummy_hcd.1/usb2/2-1/2-1:0.0/rc/rc0/input24 mceusb 2-1:0.0: Error: mce write submit urb error = -90 mceusb 2-1:0.0: Error: mce write submit urb error = -90 mceusb 2-1:0.0: Error: mce write submit urb error = -90 mceusb 2-1:0.0: Error: mce write submit urb error = -90 mceusb 2-1:0.0: Error: mce write submit urb error = -90 mceusb 2-1:0.0: Error: mce write submit urb error = -90 mceusb 2-1:0.0: Error: mce write submit urb error = -90 mceusb 2-1:0.0: Error: mce write submit urb error = -90 mceusb 2-1:0.0: Error: mce write submit urb error = -90 mceusb 2-1:0.0: Error: mce write submit urb error = -90 mceusb 2-1:0.0: Registered with mce emulator interface version 1 mceusb 2-1:0.0: 2 tx ports (0x0 cabled) and 2 rx sensors (0x0 active) usb 2-1: USB disconnect, device number 11