====================================================== WARNING: possible circular locking dependency detected 5.18.0-rc1-next-20220404-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/21629 is trying to acquire lock: ffff88801acb3130 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1682 [inline] ffff88801acb3130 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_conn_del+0x131/0x2c0 net/bluetooth/sco.c:197 but task is already holding lock: ffffffff8d76e388 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1576 [inline] ffffffff8d76e388 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xda/0x260 net/bluetooth/hci_conn.c:1458 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:600 [inline] __mutex_lock+0x12f/0x12f0 kernel/locking/mutex.c:733 hci_connect_cfm include/net/bluetooth/hci_core.h:1561 [inline] hci_remote_features_evt+0x62b/0xa20 net/bluetooth/hci_event.c:3736 hci_event_func net/bluetooth/hci_event.c:6890 [inline] hci_event_packet+0x7c1/0xf60 net/bluetooth/hci_event.c:6939 hci_rx_work+0x522/0xd60 net/bluetooth/hci_core.c:3819 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 -> #1 (&hdev->lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:600 [inline] __mutex_lock+0x12f/0x12f0 kernel/locking/mutex.c:733 sco_sock_connect+0x1eb/0xa80 net/bluetooth/sco.c:593 __sys_connect_file+0x14f/0x190 net/socket.c:1900 __sys_connect+0x161/0x190 net/socket.c:1917 __do_sys_connect net/socket.c:1927 [inline] __se_sys_connect net/socket.c:1924 [inline] __x64_sys_connect+0x6f/0xb0 net/socket.c:1924 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #0 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3096 [inline] check_prevs_add kernel/locking/lockdep.c:3219 [inline] validate_chain kernel/locking/lockdep.c:3834 [inline] __lock_acquire+0x2abe/0x5660 kernel/locking/lockdep.c:5060 lock_acquire kernel/locking/lockdep.c:5672 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5637 lock_sock_nested+0x36/0xf0 net/core/sock.c:3312 lock_sock include/net/sock.h:1682 [inline] sco_conn_del+0x131/0x2c0 net/bluetooth/sco.c:197 sco_disconn_cfm+0x71/0xb0 net/bluetooth/sco.c:1379 hci_disconn_cfm include/net/bluetooth/hci_core.h:1579 [inline] hci_conn_hash_flush+0x127/0x260 net/bluetooth/hci_conn.c:1458 hci_dev_close_sync+0x567/0x1140 net/bluetooth/hci_sync.c:4121 hci_dev_do_close+0x32/0x70 net/bluetooth/hci_core.c:553 hci_unregister_dev+0x1d0/0x550 net/bluetooth/hci_core.c:2687 vhci_release+0x7c/0xf0 drivers/bluetooth/hci_vhci.c:568 __fput+0x277/0x9d0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:37 [inline] do_exit+0xaff/0x2a00 kernel/exit.c:795 do_group_exit+0xd2/0x2f0 kernel/exit.c:925 __do_sys_exit_group kernel/exit.c:936 [inline] __se_sys_exit_group kernel/exit.c:934 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:934 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae 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 *** 3 locks held by syz-executor.4/21629: #0: ffff88801e84d048 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x2a/0x70 net/bluetooth/hci_core.c:551 #1: ffff88801e84c078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x26d/0x1140 net/bluetooth/hci_sync.c:4108 #2: ffffffff8d76e388 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1576 [inline] #2: ffffffff8d76e388 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xda/0x260 net/bluetooth/hci_conn.c:1458 stack backtrace: CPU: 1 PID: 21629 Comm: syz-executor.4 Not tainted 5.18.0-rc1-next-20220404-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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:2176 check_prev_add kernel/locking/lockdep.c:3096 [inline] check_prevs_add kernel/locking/lockdep.c:3219 [inline] validate_chain kernel/locking/lockdep.c:3834 [inline] __lock_acquire+0x2abe/0x5660 kernel/locking/lockdep.c:5060 lock_acquire kernel/locking/lockdep.c:5672 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5637 lock_sock_nested+0x36/0xf0 net/core/sock.c:3312 lock_sock include/net/sock.h:1682 [inline] sco_conn_del+0x131/0x2c0 net/bluetooth/sco.c:197 sco_disconn_cfm+0x71/0xb0 net/bluetooth/sco.c:1379 hci_disconn_cfm include/net/bluetooth/hci_core.h:1579 [inline] hci_conn_hash_flush+0x127/0x260 net/bluetooth/hci_conn.c:1458 hci_dev_close_sync+0x567/0x1140 net/bluetooth/hci_sync.c:4121 hci_dev_do_close+0x32/0x70 net/bluetooth/hci_core.c:553 hci_unregister_dev+0x1d0/0x550 net/bluetooth/hci_core.c:2687 vhci_release+0x7c/0xf0 drivers/bluetooth/hci_vhci.c:568 __fput+0x277/0x9d0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:37 [inline] do_exit+0xaff/0x2a00 kernel/exit.c:795 do_group_exit+0xd2/0x2f0 kernel/exit.c:925 __do_sys_exit_group kernel/exit.c:936 [inline] __se_sys_exit_group kernel/exit.c:934 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:934 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f677aa89049 Code: Unable to access opcode bytes at RIP 0x7f677aa8901f. RSP: 002b:00007ffc2aa139c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000064 RCX: 00007f677aa89049 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 00007f677aae225c R08: 000000000000000c R09: 00005555561573b8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000016 R13: 00007ffc2aa14ca0 R14: 00005555561573b8 R15: 00007ffc2aa15da0