====================================================== WARNING: possible circular locking dependency detected 5.10.212 #1 Not tainted ------------------------------------------------------ syz-executor.1/305341 is trying to acquire lock: ffff8880176a0b78 ((work_completion)(&hdev->bg_scan_update)){+.+.}-{0:0}, at: __flush_work+0xdd/0xa90 kernel/workqueue.c:3050 but task is already holding lock: ffffffff8561a828 (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 hci_register_dev+0x42e/0xc00 net/bluetooth/hci_core.c:3774 __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 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 (&data->open_mutex){+.+.}-{3:3}: __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:4061 hci_sched_acl_pkt net/bluetooth/hci_core.c:4586 [inline] hci_sched_acl net/bluetooth/hci_core.c:4671 [inline] hci_tx_work+0x10af/0x1660 net/bluetooth/hci_core.c:4742 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 -> #2 ((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 hci_unregister_dev+0x149/0x430 net/bluetooth/hci_core.c:3850 vhci_release+0x70/0xf0 drivers/bluetooth/hci_vhci.c:345 __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.1/305341: #0: ffffffff8561a828 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0xff/0x4b0 net/rfkill/core.c:1232 stack backtrace: CPU: 1 PID: 305341 Comm: syz-executor.1 Not tainted 5.10.212 #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: 0033:0x7fe88ac49b19 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:00007fe8881bf188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fe88ad5cf60 RCX: 00007fe88ac49b19 RDX: 0000000000000008 RSI: 0000000020000080 RDI: 0000000000000003 RBP: 00007fe88aca3f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc8eedd96f R14: 00007fe8881bf300 R15: 0000000000022000 EXT4-fs (loop4): Invalid log block size: 34304 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root EXT4-fs (loop4): Invalid log block size: 34816 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root EXT4-fs (loop4): Invalid log block size: 34816 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root EXT4-fs (loop4): Invalid log block size: 35072 EXT4-fs (loop4): Invalid log block size: 35328 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root EXT4-fs (loop4): Invalid log block size: 35584 EXT4-fs (loop4): Invalid log block size: 35584 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root EXT4-fs (loop4): Invalid log block size: 35840 EXT4-fs (loop4): Invalid log block size: 35840 EXT4-fs (loop4): Invalid log block size: 36096 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root EXT4-fs (loop4): Invalid log block size: 36096 EXT4-fs (loop4): Invalid log block size: 36352 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root EXT4-fs (loop4): Invalid log block size: 36608 EXT4-fs (loop4): Invalid log block size: 36608 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root EXT4-fs (loop4): Invalid log block size: 36864 netlink: 96 bytes leftover after parsing attributes in process `syz-executor.2'. EXT4-fs (loop4): Invalid log block size: 36864 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root EXT4-fs (loop4): Invalid log block size: 37120 EXT4-fs (loop4): Invalid log block size: 37120 udc-core: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_probe_driver returned -19 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root netlink: 'syz-executor.3': attribute type 1 has an invalid length. A link change request failed with some changes committed already. Interface wlan1 may have been left with an inconsistent configuration, please check. netlink: 'syz-executor.3': attribute type 1 has an invalid length. ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root EXT4-fs (loop4): Invalid log block size: 37376 EXT4-fs (loop4): Invalid log block size: 37376 A link change request failed with some changes committed already. Interface wlan1 may have been left with an inconsistent configuration, please check. netlink: 'syz-executor.3': attribute type 1 has an invalid length. EXT4-fs (loop4): Invalid log block size: 37632 A link change request failed with some changes committed already. Interface wlan1 may have been left with an inconsistent configuration, please check. ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root netlink: 1792 bytes leftover after parsing attributes in process `syz-executor.7'. netlink: 'syz-executor.3': attribute type 1 has an invalid length. A link change request failed with some changes committed already. Interface wlan1 may have been left with an inconsistent configuration, please check. EXT4-fs (loop4): Invalid log block size: 37888 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root netlink: 'syz-executor.3': attribute type 1 has an invalid length. EXT4-fs (loop4): Invalid log block size: 38144 netlink: 1792 bytes leftover after parsing attributes in process `syz-executor.7'. ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root netlink: 1792 bytes leftover after parsing attributes in process `syz-executor.3'. EXT4-fs (loop4): Invalid log block size: 38400 netlink: 1792 bytes leftover after parsing attributes in process `syz-executor.2'. ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root netlink: 1792 bytes leftover after parsing attributes in process `syz-executor.7'. netlink: 1792 bytes leftover after parsing attributes in process `syz-executor.3'. EXT4-fs (loop4): Invalid log block size: 38656 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root netlink: 1792 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 1792 bytes leftover after parsing attributes in process `syz-executor.7'. netlink: 1792 bytes leftover after parsing attributes in process `syz-executor.3'. EXT4-fs (loop4): Invalid log block size: 38912 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root EXT4-fs (loop4): Invalid log block size: 39168 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root ieee80211 phy111: Selected rate control algorithm 'minstrel_ht' EXT4-fs (loop4): Invalid log block size: 39424 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root EXT4-fs (loop4): Invalid log block size: 39680 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root ieee80211 phy112: Selected rate control algorithm 'minstrel_ht' EXT4-fs (loop4): Invalid log block size: 39936 audit: type=1326 audit(1710002642.262:1195): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=308352 comm="syz-executor.6" exe="/syz-executor.6" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f30f0b21b19 code=0x0 EXT4-fs (loop4): Invalid log block size: 40192 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root ieee80211 phy113: Selected rate control algorithm 'minstrel_ht' EXT4-fs (loop4): Invalid log block size: 40448 audit: type=1326 audit(1710002643.091:1196): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=308352 comm="syz-executor.6" exe="/syz-executor.6" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f30f0b21b19 code=0x0 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root EXT4-fs (loop4): Invalid log block size: 40704 ieee80211 phy114: Selected rate control algorithm 'minstrel_ht' audit: type=1326 audit(1710002643.286:1197): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=308506 comm="syz-executor.6" exe="/syz-executor.6" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f30f0b21b19 code=0x0 EXT4-fs (loop4): Invalid log block size: 40960 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root EXT4-fs (loop4): Invalid log block size: 41216 EXT4-fs (loop4): Invalid log block size: 41472 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root audit: type=1326 audit(1710002644.306:1198): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=309004 comm="syz-executor.6" exe="/syz-executor.6" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f30f0b21b19 code=0x0 EXT4-fs (loop4): Invalid log block size: 41728 EXT4-fs (loop4): Invalid log block size: 41728 EXT4-fs (loop4): Invalid log block size: 41984 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root audit: type=1326 audit(1710002645.320:1199): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=309268 comm="syz-executor.6" exe="/syz-executor.6" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f30f0b21b19 code=0x0 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root EXT4-fs (loop4): Invalid log block size: 42240 EXT4-fs (loop4): Invalid log block size: 42240 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root EXT4-fs (loop4): Invalid log block size: 42496 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root EXT4-fs (loop4): Invalid log block size: 42752 EXT4-fs (loop4): Invalid log block size: 42752 EXT4-fs (loop4): Invalid log block size: 43008 EXT4-fs (loop4): Invalid log block size: 43008 EXT4-fs (loop4): Invalid log block size: 43264