INFO: task kworker/u8:6:280 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:6 state:D stack:0 pid:280 tgid:280 ppid:2 task_flags:0x4208060 flags:0x00000010 Workqueue: cfg80211 cfg80211_event_work Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5256 [inline] __schedule+0x1250/0x2a7c kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6960 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7017 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:692 __mutex_lock kernel/locking/mutex.c:776 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828 class_wiphy_constructor include/net/cfg80211.h:6363 [inline] cfg80211_event_work+0x28/0x70 net/wireless/core.c:332 process_one_work+0x7c0/0x1558 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3421 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 INFO: task kworker/u8:16:4223 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:16 state:D stack:0 pid:4223 tgid:4223 ppid:2 task_flags:0x4208060 flags:0x00000010 Workqueue: ipv6_addrconf addrconf_dad_work Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5256 [inline] __schedule+0x1250/0x2a7c kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6960 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7017 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:692 __mutex_lock kernel/locking/mutex.c:776 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828 rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 rtnl_net_lock include/linux/rtnetlink.h:130 [inline] addrconf_dad_work+0x100/0x10cc net/ipv6/addrconf.c:4194 process_one_work+0x7c0/0x1558 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3421 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 Showing all locks held in the system: 1 lock held by kthreadd/2: 3 locks held by kworker/u8:0/12: 3 locks held by kworker/u8:1/13: 4 locks held by kworker/1:0/24: #0: ffff0000c0029948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff800097dc7be0 (reg_work){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 #2: ffff800092ae4168 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 #3: ffff0000c1cf8788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6363 [inline] #3: ffff0000c1cf8788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_process_self_managed_hints+0x98/0x1dc net/wireless/reg.c:3179 2 locks held by kworker/1:1/26: 1 lock held by khungtaskd/32: #0: ffff80008fa5b520 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 3 locks held by kworker/u8:2/41: 3 locks held by kworker/u8:3/42: 1 lock held by pr/ttyAMA-1/43: 5 locks held by kworker/u8:4/75: 2 locks held by kworker/u8:5/122: 3 locks held by kworker/u8:6/280: #0: ffff0000c36e7148 ((wq_completion)cfg80211){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff800099a17be0 ((work_completion)(&rdev->event_work)){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 #2: ffff0000c1cf8788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6363 [inline] #2: ffff0000c1cf8788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: cfg80211_event_work+0x28/0x70 net/wireless/core.c:332 6 locks held by kworker/u8:7/378: #0: ffff0000c1ff3148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff80009c627be0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 #2: ffff0000db70e0e0 (&type->s_umount_key#30){++++}-{4:4}, at: super_trylock_shared+0x24/0xdc fs/super.c:563 #3: ffff0000db710b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: percpu_down_read include/linux/percpu-rwsem.h:77 [inline] #3: ffff0000db710b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1820 [inline] #3: ffff0000db710b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x150/0x2a0 fs/ext4/inode.c:3025 #4: ffff0000db712950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xe4c/0x10dc fs/jbd2/transaction.c:442 #5: ffff0000e0c73290 (&ei->i_data_sem){++++}-{4:4}, at: ext4_map_blocks+0x69c/0x1548 fs/ext4/inode.c:815 5 locks held by kworker/u8:8/664: 2 locks held by kworker/u8:9/1460: 3 locks held by kworker/u8:10/1512: 3 locks held by kworker/u8:12/3667: #0: ffff0000c0032148 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff8000a3e97be0 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 #2: ffff800092ae4168 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 3 locks held by kworker/u8:13/3780: 3 locks held by kworker/u8:14/3859: 3 locks held by kworker/u8:16/4223: #0: ffff0000d49db948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff8000a17c7be0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 #2: ffff800092ae4168 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 3 locks held by kworker/u8:17/4845: 3 locks held by kworker/u8:18/4944: 3 locks held by kworker/u8:19/5386: 3 locks held by kworker/u8:20/5787: #0: ffff0000c0032148 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff8000a4a87be0 ((crda_timeout).work){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 #2: ffff800092ae4168 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 1 lock held by klogd/6200: 1 lock held by udevd/6211: 1 lock held by dhcpcd/6265: 1 lock held by dhcpcd/6266: 2 locks held by getty/6353: #0: ffff0000d529c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff800099f1e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x34c/0xfc8 drivers/tty/n_tty.c:2211 2 locks held by syz-executor/6570: 1 lock held by syz-executor/6571: 6 locks held by kworker/u9:3/6575: #0: ffff0000ca0ec948 ((wq_completion)hci3){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff8000a3e27be0 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 #2: ffff0000cd658ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x184/0x38c net/bluetooth/hci_sync.c:331 #3: ffff0000cd6580c0 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0x1d4/0xbb8 net/bluetooth/hci_sync.c:5702 #4: ffff800092c4f248 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:2128 [inline] #4: ffff800092c4f248 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_failed+0x13c/0x340 net/bluetooth/hci_conn.c:1336 #5: ffff0000ca188b38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x78/0x53c net/bluetooth/l2cap_core.c:1763 2 locks held by syz-executor/6576: 4 locks held by kworker/u9:4/6577: #0: ffff0000c2663148 ((wq_completion)hci0){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff8000a3e17be0 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 #2: ffff0000cac44ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x184/0x38c net/bluetooth/hci_sync.c:331 #3: ffff0000cac440c0 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0x1d4/0xbb8 net/bluetooth/hci_sync.c:5702 1 lock held by syz-executor/6578: #0: ffff800092ae4168 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #0: ffff800092ae4168 (rtnl_mutex){+.+.}-{4:4}, at: rtnetlink_rcv_msg+0x5dc/0x97c net/core/rtnetlink.c:6964 4 locks held by syz-executor/6579: 4 locks held by kworker/0:4/6632: 2 locks held by kworker/0:7/6654: 3 locks held by kworker/u8:21/6717: 2 locks held by kworker/u8:22/6720: 2 locks held by kworker/1:9/6721: 2 locks held by kworker/u8:23/6722: 3 locks held by kworker/u8:25/6727: 1 lock held by dhcpcd/6731: 3 locks held by syz-executor/6732: =============================================