====================================================== WARNING: possible circular locking dependency detected 5.15.133-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/4113 is trying to acquire lock: ffff88807a871120 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1668 [inline] ffff88807a871120 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_conn_del+0x104/0x300 net/bluetooth/sco.c:196 but task is already holding lock: ffffffff8db2c348 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1518 [inline] ffffffff8db2c348 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xb8/0x210 net/bluetooth/hci_conn.c:1610 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (hci_cb_list_lock){+.+.}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 hci_connect_cfm include/net/bluetooth/hci_core.h:1503 [inline] hci_remote_features_evt+0x6d1/0xb50 net/bluetooth/hci_event.c:3323 hci_event_packet+0x6da/0x1480 net/bluetooth/hci_event.c:6376 hci_rx_work+0x240/0x7d0 net/bluetooth/hci_core.c:5153 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 -> #1 (&hdev->lock){+.+.}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 sco_sock_connect+0x181/0x8c0 net/bluetooth/sco.c:587 __sys_connect_file net/socket.c:1899 [inline] __sys_connect+0x38b/0x410 net/socket.c:1916 __do_sys_connect net/socket.c:1926 [inline] __se_sys_connect net/socket.c:1923 [inline] __x64_sys_connect+0x76/0x80 net/socket.c:1923 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb -> #0 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1646/0x58b0 kernel/locking/lockdep.c:3787 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5011 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 lock_sock_nested+0x44/0x100 net/core/sock.c:3231 lock_sock include/net/sock.h:1668 [inline] sco_conn_del+0x104/0x300 net/bluetooth/sco.c:196 hci_disconn_cfm include/net/bluetooth/hci_core.h:1521 [inline] hci_conn_hash_flush+0x10d/0x210 net/bluetooth/hci_conn.c:1610 hci_dev_do_close+0x9f6/0x1000 net/bluetooth/hci_core.c:1795 hci_rfkill_set_block+0x114/0x180 net/bluetooth/hci_core.c:2235 rfkill_set_block+0x1e7/0x430 net/rfkill/core.c:345 rfkill_fop_write+0x5b7/0x790 net/rfkill/core.c:1274 vfs_write+0x30c/0xe50 fs/read_write.c:592 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb 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 syz-executor.3/4113: #0: ffffffff8dc6ea48 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0x1a5/0x790 net/rfkill/core.c:1266 #1: ffff888077bacff0 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x5e/0x1000 net/bluetooth/hci_core.c:1737 #2: ffff888077bac078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_do_close+0x42c/0x1000 net/bluetooth/hci_core.c:1782 #3: ffffffff8db2c348 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1518 [inline] #3: ffffffff8db2c348 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xb8/0x210 net/bluetooth/hci_conn.c:1610 stack backtrace: CPU: 0 PID: 4113 Comm: syz-executor.3 Not tainted 5.15.133-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1646/0x58b0 kernel/locking/lockdep.c:3787 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5011 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 lock_sock_nested+0x44/0x100 net/core/sock.c:3231 lock_sock include/net/sock.h:1668 [inline] sco_conn_del+0x104/0x300 net/bluetooth/sco.c:196 hci_disconn_cfm include/net/bluetooth/hci_core.h:1521 [inline] hci_conn_hash_flush+0x10d/0x210 net/bluetooth/hci_conn.c:1610 hci_dev_do_close+0x9f6/0x1000 net/bluetooth/hci_core.c:1795 hci_rfkill_set_block+0x114/0x180 net/bluetooth/hci_core.c:2235 rfkill_set_block+0x1e7/0x430 net/rfkill/core.c:345 rfkill_fop_write+0x5b7/0x790 net/rfkill/core.c:1274 vfs_write+0x30c/0xe50 fs/read_write.c:592 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fbafc1b4ae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbafb5150c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fbafc2d4050 RCX: 00007fbafc1b4ae9 RDX: 0000000000000008 RSI: 0000000020000080 RDI: 0000000000000003 RBP: 00007fbafc20047a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007fbafc2d4050 R15: 00007fff038fbbe8