====================================================== WARNING: possible circular locking dependency detected 5.10.220 #1 Not tainted ------------------------------------------------------ syz-executor.0/205259 is trying to acquire lock: ffff88800cf7cb78 ((work_completion)(&hdev->bg_scan_update)){+.+.}-{0:0}, at: __flush_work+0xdd/0xa90 kernel/workqueue.c:3050 but task is already holding lock: ffffffff8561bd08 (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:328 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:298 -> #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:328 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:298 -> #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+0x285/0x9f0 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 __do_sys_exit_group kernel/exit.c:991 [inline] __se_sys_exit_group kernel/exit.c:989 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:989 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x67/0xd1 -> #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:277 [inline] bg_scan_update+0x82/0x500 net/bluetooth/hci_request.c:2897 process_one_work+0x9a9/0x14b0 kernel/workqueue.c:2282 worker_thread+0x61d/0x1310 kernel/workqueue.c:2428 kthread+0x38f/0x470 kernel/kthread.c:328 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:298 -> #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:3440 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/0xb10 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+0x67/0xd1 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.0/205259: #0: ffffffff8561bd08 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0xff/0x4b0 net/rfkill/core.c:1232 stack backtrace: CPU: 0 PID: 205259 Comm: syz-executor.0 Not tainted 5.10.220 #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:3440 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/0xb10 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+0x67/0xd1 RIP: 0033:0x7fa2166cdb19 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:00007fa213c43188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fa2167e0f60 RCX: 00007fa2166cdb19 RDX: 0000000000000008 RSI: 0000000020000080 RDI: 0000000000000003 RBP: 00007fa216727f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd6bff4fff R14: 00007fa213c43300 R15: 0000000000022000 serio: Serial port tty20 serio: Serial port tty20 serio: Serial port tty22 __nla_validate_parse: 1 callbacks suppressed netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. serio: Serial port tty22 serio: Serial port tty20 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. serio: Serial port tty22 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. serio: Serial port tty20 ieee80211 phy91: Selected rate control algorithm 'minstrel_ht' netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. ieee80211 phy92: Selected rate control algorithm 'minstrel_ht' netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. ieee80211 phy93: Selected rate control algorithm 'minstrel_ht' netlink: 24 bytes leftover after parsing attributes in process `syz-executor.7'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. ieee80211 phy94: Selected rate control algorithm 'minstrel_ht' ieee80211 phy95: Selected rate control algorithm 'minstrel_ht' netlink: 24 bytes leftover after parsing attributes in process `syz-executor.7'. ieee80211 phy96: Selected rate control algorithm 'minstrel_ht' ieee80211 phy97: Selected rate control algorithm 'minstrel_ht' ieee80211 phy98: Selected rate control algorithm 'minstrel_ht' audit: type=1326 audit(2000000023.966:772): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=213573 comm="syz-executor.6" exe="/syz-executor.6" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f9cb95f1b19 code=0x7ffc0000 audit: type=1326 audit(2000000023.968:773): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=213573 comm="syz-executor.6" exe="/syz-executor.6" sig=0 arch=c000003e syscall=298 compat=0 ip=0x7f9cb95f1b19 code=0x7ffc0000 audit: type=1326 audit(2000000023.973:774): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=213573 comm="syz-executor.6" exe="/syz-executor.6" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f9cb95f1b19 code=0x7ffc0000 audit: type=1326 audit(2000000023.975:775): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=213573 comm="syz-executor.6" exe="/syz-executor.6" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f9cb95f1b19 code=0x7ffc0000 audit: type=1326 audit(2000000023.977:776): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=213573 comm="syz-executor.6" exe="/syz-executor.6" sig=0 arch=c000003e syscall=257 compat=0 ip=0x7f9cb95a4a04 code=0x7ffc0000 audit: type=1326 audit(2000000023.977:777): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=213573 comm="syz-executor.6" exe="/syz-executor.6" sig=0 arch=c000003e syscall=257 compat=0 ip=0x7f9cb95a4a04 code=0x7ffc0000 audit: type=1326 audit(2000000023.977:778): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=213573 comm="syz-executor.6" exe="/syz-executor.6" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f9cb95f1b19 code=0x7ffc0000 audit: type=1326 audit(2000000023.977:779): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=213573 comm="syz-executor.6" exe="/syz-executor.6" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f9cb95f1b19 code=0x7ffc0000 audit: type=1326 audit(2000000023.977:780): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=213573 comm="syz-executor.6" exe="/syz-executor.6" sig=0 arch=c000003e syscall=20 compat=0 ip=0x7f9cb95f1b19 code=0x7ffc0000 audit: type=1326 audit(2000000023.978:781): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=213573 comm="syz-executor.6" exe="/syz-executor.6" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f9cb95f1b19 code=0x7ffc0000 __nla_validate_parse: 3 callbacks suppressed netlink: 112 bytes leftover after parsing attributes in process `syz-executor.6'. netlink: 112 bytes leftover after parsing attributes in process `syz-executor.6'. netlink: 112 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 112 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 112 bytes leftover after parsing attributes in process `syz-executor.6'. netlink: 112 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 112 bytes leftover after parsing attributes in process `syz-executor.6'. netlink: 112 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 112 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 112 bytes leftover after parsing attributes in process `syz-executor.3'. mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium 9pnet: Insufficient options for proto=fd SELinux: Context system_u:object_r:inetd_var_run_t:s0 is not valid (left unmapped). kauditd_printk_skb: 22 callbacks suppressed audit: type=1400 audit(2000000030.294:804): avc: denied { relabelto } for pid=221210 comm="syz-executor.4" name="UDPv6" dev="sockfs" ino=117288 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=udp_socket permissive=1 trawcon="system_u:object_r:inetd_var_run_t:s0" 9pnet: Insufficient options for proto=fd ieee80211 phy99: Selected rate control algorithm 'minstrel_ht' 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd