sd 0:0:0:0: [sg0] tag#0 CDB[60]: bc 3e 88 0a 07 35 1c 1f 28 ee e5 00 c2 f1 00 43 sd 0:0:0:0: [sg0] tag#0 CDB[70]: 42 ba 32 72 9pnet: Unknown protocol version  ====================================================== WARNING: possible circular locking dependency detected 5.10.209 #1 Not tainted ------------------------------------------------------ syz-executor.3/57204 is trying to acquire lock: ffff88801796cb78 ((work_completion)(&hdev->bg_scan_update)){+.+.}-{0:0}, at: __flush_work+0xdd/0xa90 kernel/workqueue.c:3050 but task is already holding lock: ffffffff85619668 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0xff/0x4b0 net/rfkill/core.c:1232 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (rfkill_global_mutex){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:968 [inline] __mutex_lock+0x13d/0x10b0 kernel/locking/mutex.c:1109 rfkill_register+0x36/0xa10 net/rfkill/core.c:1016 sd 0:0:0:0: [sg0] tag#0 FAILED Result: hostbyte=DID_ABORT driverbyte=DRIVER_OK cmd_age=0s hci_register_dev+0x42e/0xc00 net/bluetooth/hci_core.c:3773 __vhci_create_device+0x2c8/0x5c0 drivers/bluetooth/hci_vhci.c:129 vhci_create_device drivers/bluetooth/hci_vhci.c:153 [inline] vhci_open_timeout+0x38/0x50 drivers/bluetooth/hci_vhci.c:310 sd 0:0:0:0: [sg0] tag#0 CDB: opcode=0x4f process_one_work+0x9a9/0x14b0 kernel/workqueue.c:2282 worker_thread+0x61d/0x1310 kernel/workqueue.c:2428 kthread+0x38f/0x470 kernel/kthread.c:313 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:299 -> #3 sd 0:0:0:0: [sg0] tag#0 CDB[00]: 4f eb 7d c9 16 6b 64 47 a0 88 58 20 72 c2 38 80 (&data->open_mutex){+.+.}-{3:3}: sd 0:0:0:0: [sg0] tag#0 CDB[10]: 0a 92 45 1d 11 3f 8c 05 80 44 1e 89 65 95 a1 22 __mutex_lock_common kernel/locking/mutex.c:968 [inline] __mutex_lock+0x13d/0x10b0 kernel/locking/mutex.c:1109 vhci_send_frame+0x63/0xa0 drivers/bluetooth/hci_vhci.c:71 hci_send_frame+0x1b9/0x320 net/bluetooth/hci_core.c:4060 sd 0:0:0:0: [sg0] tag#0 CDB[20]: 5a 32 81 da 76 79 8b 77 19 fc 27 f0 eb 03 4b c3 hci_sched_acl_pkt net/bluetooth/hci_core.c:4585 [inline] hci_sched_acl net/bluetooth/hci_core.c:4670 [inline] hci_tx_work+0x10af/0x1660 net/bluetooth/hci_core.c:4741 process_one_work+0x9a9/0x14b0 kernel/workqueue.c:2282 worker_thread+0x61d/0x1310 kernel/workqueue.c:2428 sd 0:0:0:0: [sg0] tag#0 CDB[30]: c3 e0 44 32 5e 23 da 76 0e 24 d9 51 76 cb a6 d6 sd 0:0:0:0: [sg0] tag#0 CDB[40]: 0b bf c8 4f f2 36 bb 97 f7 da 86 1f 57 09 85 17 kthread+0x38f/0x470 kernel/kthread.c:313 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:299 -> #2 sd 0:0:0:0: [sg0] tag#0 CDB[50]: a4 a0 38 8b 16 42 52 c8 00 d2 8d 9a 83 1a 12 60 ((work_completion)(&hdev->tx_work)){+.+.}-{0:0}: __flush_work+0x105/0xa90 kernel/workqueue.c:3053 hci_dev_do_close+0x131/0x1240 net/bluetooth/hci_core.c:1745 sd 0:0:0:0: [sg0] tag#0 CDB[60]: bc 3e 88 0a 07 35 1c 1f 28 ee e5 00 c2 f1 00 43 hci_unregister_dev+0x149/0x430 net/bluetooth/hci_core.c:3849 vhci_release+0x70/0xf0 drivers/bluetooth/hci_vhci.c:345 sd 0:0:0:0: [sg0] tag#0 CDB[70]: 42 ba 32 72 __fput+0x285/0x980 fs/file_table.c:281 task_work_run+0xe2/0x1a0 kernel/task_work.c:161 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0xb6f/0x2600 kernel/exit.c:858 do_group_exit+0x125/0x310 kernel/exit.c:980 get_signal+0x4bc/0x22e0 kernel/signal.c:2751 arch_do_signal_or_restart+0x2b7/0x1990 arch/x86/kernel/signal.c:805 handle_signal_work kernel/entry/common.c:145 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x10f/0x190 kernel/entry/common.c:199 syscall_exit_to_user_mode+0x38/0x1e0 kernel/entry/common.c:274 entry_SYSCALL_64_after_hwframe+0x62/0xc7 -> #1 (&hdev->req_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:968 [inline] __mutex_lock+0x13d/0x10b0 kernel/locking/mutex.c:1109 hci_req_sync net/bluetooth/hci_request.c:275 [inline] bg_scan_update+0x82/0x500 net/bluetooth/hci_request.c:2895 process_one_work+0x9a9/0x14b0 kernel/workqueue.c:2282 worker_thread+0x61d/0x1310 kernel/workqueue.c:2428 kthread+0x38f/0x470 kernel/kthread.c:313 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:299 -> #0 ((work_completion)(&hdev->bg_scan_update)){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:2988 [inline] check_prevs_add kernel/locking/lockdep.c:3113 [inline] validate_chain kernel/locking/lockdep.c:3729 [inline] __lock_acquire+0x29e7/0x5b00 kernel/locking/lockdep.c:4955 lock_acquire kernel/locking/lockdep.c:5566 [inline] lock_acquire+0x197/0x470 kernel/locking/lockdep.c:5531 __flush_work+0x105/0xa90 kernel/workqueue.c:3053 __cancel_work_timer+0x368/0x4c0 kernel/workqueue.c:3144 hci_request_cancel_all+0x73/0x230 net/bluetooth/hci_request.c:3438 hci_dev_do_close+0xd9/0x1240 net/bluetooth/hci_core.c:1733 hci_rfkill_set_block+0x166/0x1a0 net/bluetooth/hci_core.c:2223 rfkill_set_block+0x1fd/0x540 net/rfkill/core.c:341 rfkill_fop_write+0x253/0x4b0 net/rfkill/core.c:1240 vfs_write+0x29a/0xa70 fs/read_write.c:603 ksys_write+0x1f6/0x260 fs/read_write.c:658 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x62/0xc7 other info that might help us debug this: Chain exists of: (work_completion)(&hdev->bg_scan_update) --> &data->open_mutex --> rfkill_global_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(rfkill_global_mutex); lock(&data->open_mutex); lock(rfkill_global_mutex); lock((work_completion)(&hdev->bg_scan_update)); *** DEADLOCK *** 1 lock held by syz-executor.3/57204: #0: ffffffff85619668 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0xff/0x4b0 net/rfkill/core.c:1232 stack backtrace: CPU: 0 PID: 57204 Comm: syz-executor.3 Not tainted 5.10.209 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x167 lib/dump_stack.c:118 check_noncircular+0x263/0x2e0 kernel/locking/lockdep.c:2123 check_prev_add kernel/locking/lockdep.c:2988 [inline] check_prevs_add kernel/locking/lockdep.c:3113 [inline] validate_chain kernel/locking/lockdep.c:3729 [inline] __lock_acquire+0x29e7/0x5b00 kernel/locking/lockdep.c:4955 lock_acquire kernel/locking/lockdep.c:5566 [inline] lock_acquire+0x197/0x470 kernel/locking/lockdep.c:5531 __flush_work+0x105/0xa90 kernel/workqueue.c:3053 __cancel_work_timer+0x368/0x4c0 kernel/workqueue.c:3144 hci_request_cancel_all+0x73/0x230 net/bluetooth/hci_request.c:3438 hci_dev_do_close+0xd9/0x1240 net/bluetooth/hci_core.c:1733 hci_rfkill_set_block+0x166/0x1a0 net/bluetooth/hci_core.c:2223 rfkill_set_block+0x1fd/0x540 net/rfkill/core.c:341 rfkill_fop_write+0x253/0x4b0 net/rfkill/core.c:1240 vfs_write+0x29a/0xa70 fs/read_write.c:603 ksys_write+0x1f6/0x260 fs/read_write.c:658 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x62/0xc7 RIP: 0033:0x7fe6aced0b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe6aa425188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fe6acfe4020 RCX: 00007fe6aced0b19 RDX: 0000000000000008 RSI: 00000000200000c0 RDI: 0000000000000007 RBP: 00007fe6acf2af6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffce16b550f R14: 00007fe6aa425300 R15: 0000000000022000 sd 0:0:0:0: [sg0] tag#0 FAILED Result: hostbyte=DID_ABORT driverbyte=DRIVER_OK cmd_age=0s sd 0:0:0:0: [sg0] tag#0 CDB: opcode=0x4f sd 0:0:0:0: [sg0] tag#0 CDB[00]: 4f eb 7d c9 16 6b 64 47 a0 88 58 20 72 c2 38 80 sd 0:0:0:0: [sg0] tag#0 CDB[10]: 0a 92 45 1d 11 3f 8c 05 80 44 1e 89 65 95 a1 22 sd 0:0:0:0: [sg0] tag#0 CDB[20]: 5a 32 81 da 76 79 8b 77 19 fc 27 f0 eb 03 4b c3 sd 0:0:0:0: [sg0] tag#0 CDB[30]: c3 e0 44 32 5e 23 da 76 0e 24 d9 51 76 cb a6 d6 sd 0:0:0:0: [sg0] tag#0 CDB[40]: 0b bf c8 4f f2 36 bb 97 f7 da 86 1f 57 09 85 17 sd 0:0:0:0: [sg0] tag#0 CDB[50]: a4 a0 38 8b 16 42 52 c8 00 d2 8d 9a 83 1a 12 60 sd 0:0:0:0: [sg0] tag#0 CDB[60]: bc 3e 88 0a 07 35 1c 1f 28 ee e5 00 c2 f1 00 43 sd 0:0:0:0: [sg0] tag#0 CDB[70]: 42 ba 32 72 sd 0:0:0:0: [sg0] tag#0 FAILED Result: hostbyte=DID_ABORT driverbyte=DRIVER_OK cmd_age=0s sd 0:0:0:0: [sg0] tag#0 CDB: opcode=0x4f sd 0:0:0:0: [sg0] tag#0 CDB[00]: 4f eb 7d c9 16 6b 64 47 a0 88 58 20 72 c2 38 80 sd 0:0:0:0: [sg0] tag#0 CDB[10]: 0a 92 45 1d 11 3f 8c 05 80 44 1e 89 65 95 a1 22 sd 0:0:0:0: [sg0] tag#0 CDB[20]: 5a 32 81 da 76 79 8b 77 19 fc 27 f0 eb 03 4b c3 sd 0:0:0:0: [sg0] tag#0 CDB[30]: c3 e0 44 32 5e 23 da 76 0e 24 d9 51 76 cb a6 d6 sd 0:0:0:0: [sg0] tag#0 CDB[40]: 0b bf c8 4f f2 36 bb 97 f7 da 86 1f 57 09 85 17 sd 0:0:0:0: [sg0] tag#0 CDB[50]: a4 a0 38 8b 16 42 52 c8 00 d2 8d 9a 83 1a 12 60 sd 0:0:0:0: [sg0] tag#0 CDB[60]: bc 3e 88 0a 07 35 1c 1f 28 ee e5 00 c2 f1 00 43 sd 0:0:0:0: [sg0] tag#0 CDB[70]: 42 ba 32 72 FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 57333 Comm: syz-executor.5 Not tainted 5.10.209 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x167 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:52 [inline] should_fail.cold+0x5/0xa lib/fault-inject.c:146 copyout lib/iov_iter.c:144 [inline] _copy_to_iter+0x264/0x12d0 lib/iov_iter.c:625 copy_to_iter include/linux/uio.h:151 [inline] simple_copy_to_iter+0x4c/0x70 net/core/datagram.c:519 __skb_datagram_iter+0x4f7/0x880 net/core/datagram.c:448 skb_copy_datagram_iter+0x88/0x190 net/core/datagram.c:533 skb_copy_datagram_msg include/linux/skbuff.h:3548 [inline] tcp_recvmsg+0x13b5/0x2930 net/ipv4/tcp.c:2284 inet6_recvmsg+0x13b/0x6e0 net/ipv6/af_inet6.c:667 sock_recvmsg_nosec net/socket.c:904 [inline] sock_recvmsg+0xff/0x180 net/socket.c:922 __sys_recvfrom+0x1be/0x2f0 net/socket.c:2062 __do_sys_recvfrom net/socket.c:2080 [inline] __se_sys_recvfrom net/socket.c:2076 [inline] __x64_sys_recvfrom+0xdd/0x1b0 net/socket.c:2076 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x62/0xc7 RIP: 0033:0x7fdd4794ab19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fdd44e9f188 EFLAGS: 00000246 ORIG_RAX: 000000000000002d RAX: ffffffffffffffda RBX: 00007fdd47a5e020 RCX: 00007fdd4794ab19 RDX: 0000000000001000 RSI: 0000000020001e00 RDI: 0000000000000003 RBP: 00007fdd44e9f1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000cd08 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffc786f936f R14: 00007fdd44e9f300 R15: 0000000000022000 sd 0:0:0:0: [sg0] tag#0 FAILED Result: hostbyte=DID_ABORT driverbyte=DRIVER_OK cmd_age=0s sd 0:0:0:0: [sg0] tag#0 CDB: opcode=0x4f sd 0:0:0:0: [sg0] tag#0 CDB[00]: 4f eb 7d c9 16 6b 64 47 a0 88 58 20 72 c2 38 80 sd 0:0:0:0: [sg0] tag#0 CDB[10]: 0a 92 45 1d 11 3f 8c 05 80 44 1e 89 65 95 a1 22 sd 0:0:0:0: [sg0] tag#0 CDB[20]: 5a 32 81 da 76 79 8b 77 19 fc 27 f0 eb 03 4b c3 sd 0:0:0:0: [sg0] tag#0 CDB[30]: c3 e0 44 32 5e 23 da 76 0e 24 d9 51 76 cb a6 d6 sd 0:0:0:0: [sg0] tag#0 CDB[40]: 0b bf c8 4f f2 36 bb 97 f7 da 86 1f 57 09 85 17 sd 0:0:0:0: [sg0] tag#0 CDB[50]: a4 a0 38 8b 16 42 52 c8 00 d2 8d 9a 83 1a 12 60 sd 0:0:0:0: [sg0] tag#0 CDB[60]: bc 3e 88 0a 07 35 1c 1f 28 ee e5 00 c2 f1 00 43 sd 0:0:0:0: [sg0] tag#0 CDB[70]: 42 ba 32 72 Bluetooth: hci2: command 0x0409 tx timeout Bluetooth: hci2: command 0x041b tx timeout Bluetooth: hci2: command 0x040f tx timeout ieee80211 phy30: Selected rate control algorithm 'minstrel_ht' wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready ieee80211 phy31: Selected rate control algorithm 'minstrel_ht' wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue audit: type=1400 audit(1707909651.192:43): avc: denied { relabelto } for pid=57799 comm="syz-executor.2" name="/" dev="loop2" ino=2 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:mtrr_device_t:s0 tclass=dir permissive=1