====================================================== WARNING: possible circular locking dependency detected 6.0.0-rc7-syzkaller-00239-gb357fd1c2afc #0 Not tainted ------------------------------------------------------ kworker/u5:0/49 is trying to acquire lock: ffff888076901130 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1712 [inline] ffff888076901130 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_conn_del+0x12c/0x2b0 net/bluetooth/sco.c:197 but task is already holding lock: ffffffff8d9d3ea8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1761 [inline] ffffffff8d9d3ea8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_sco_setup+0x2f6/0x4a0 net/bluetooth/hci_conn.c:569 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (hci_cb_list_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12f/0x1350 kernel/locking/mutex.c:747 hci_connect_cfm+0x26/0x140 include/net/bluetooth/hci_core.h:1761 hci_remote_features_evt+0x494/0x900 net/bluetooth/hci_event.c:3757 hci_event_func net/bluetooth/hci_event.c:7443 [inline] hci_event_packet+0x952/0xfd0 net/bluetooth/hci_event.c:7495 hci_rx_work+0xae7/0x1230 net/bluetooth/hci_core.c:4007 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 -> #1 (&hdev->lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12f/0x1350 kernel/locking/mutex.c:747 sco_sock_connect+0x1e6/0xa70 net/bluetooth/sco.c:593 __sys_connect_file+0x14f/0x190 net/socket.c:1976 __sys_connect+0x161/0x190 net/socket.c:1993 __do_sys_connect net/socket.c:2003 [inline] __se_sys_connect net/socket.c:2000 [inline] __x64_sys_connect+0x6f/0xb0 net/socket.c:2000 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3829 [inline] __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5053 lock_acquire kernel/locking/lockdep.c:5666 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631 lock_sock_nested+0x36/0xf0 net/core/sock.c:3393 lock_sock include/net/sock.h:1712 [inline] sco_conn_del+0x12c/0x2b0 net/bluetooth/sco.c:197 sco_connect_cfm+0x1f0/0x910 net/bluetooth/sco.c:1369 hci_connect_cfm include/net/bluetooth/hci_core.h:1764 [inline] hci_sco_setup+0x361/0x4a0 net/bluetooth/hci_conn.c:569 hci_conn_complete_evt+0xcdc/0xe50 net/bluetooth/hci_event.c:3193 hci_event_func net/bluetooth/hci_event.c:7443 [inline] hci_event_packet+0x952/0xfd0 net/bluetooth/hci_event.c:7495 hci_rx_work+0xae7/0x1230 net/bluetooth/hci_core.c:4007 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 other info that might help us debug this: Chain exists of: sk_lock-AF_BLUETOOTH-BTPROTO_SCO --> &hdev->lock --> hci_cb_list_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(hci_cb_list_lock); lock(&hdev->lock); lock(hci_cb_list_lock); lock(sk_lock-AF_BLUETOOTH-BTPROTO_SCO); *** DEADLOCK *** 4 locks held by kworker/u5:0/49: #0: ffff88802029f138 ((wq_completion)hci0#2){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88802029f138 ((wq_completion)hci0#2){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff88802029f138 ((wq_completion)hci0#2){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff88802029f138 ((wq_completion)hci0#2){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline] #0: ffff88802029f138 ((wq_completion)hci0#2){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline] #0: ffff88802029f138 ((wq_completion)hci0#2){+.+.}-{0:0}, at: process_one_work+0x87a/0x1610 kernel/workqueue.c:2260 #1: ffffc90000ba7da8 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264 #2: ffff8880778dc078 (&hdev->lock){+.+.}-{3:3}, at: hci_conn_complete_evt+0xb6/0xe50 net/bluetooth/hci_event.c:3089 #3: ffffffff8d9d3ea8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1761 [inline] #3: ffffffff8d9d3ea8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_sco_setup+0x2f6/0x4a0 net/bluetooth/hci_conn.c:569 stack backtrace: CPU: 0 PID: 49 Comm: kworker/u5:0 Not tainted 6.0.0-rc7-syzkaller-00239-gb357fd1c2afc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Workqueue: hci0 hci_rx_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3829 [inline] __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5053 lock_acquire kernel/locking/lockdep.c:5666 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631 lock_sock_nested+0x36/0xf0 net/core/sock.c:3393 lock_sock include/net/sock.h:1712 [inline] sco_conn_del+0x12c/0x2b0 net/bluetooth/sco.c:197 sco_connect_cfm+0x1f0/0x910 net/bluetooth/sco.c:1369 hci_connect_cfm include/net/bluetooth/hci_core.h:1764 [inline] hci_sco_setup+0x361/0x4a0 net/bluetooth/hci_conn.c:569 hci_conn_complete_evt+0xcdc/0xe50 net/bluetooth/hci_event.c:3193 hci_event_func net/bluetooth/hci_event.c:7443 [inline] hci_event_packet+0x952/0xfd0 net/bluetooth/hci_event.c:7495 hci_rx_work+0xae7/0x1230 net/bluetooth/hci_core.c:4007 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Bluetooth: hci1: unexpected cc 0x0c03 length: 249 > 1 Bluetooth: hci3: unexpected cc 0x0c03 length: 249 > 1 Bluetooth: hci3: unexpected cc 0x1003 length: 249 > 9 Bluetooth: hci3: unexpected cc 0x1001 length: 249 > 9 Bluetooth: hci3: unexpected cc 0x0c23 length: 249 > 4 Bluetooth: hci3: unexpected cc 0x0c25 length: 249 > 3 Bluetooth: hci3: unexpected cc 0x0c38 length: 249 > 2 Bluetooth: hci4: Opcode 0x c03 failed: -110