INFO: task kworker/u8:2:39 blocked for more than 153 seconds. Tainted: G L syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:2 state:D stack:0 pid:39 tgid:39 ppid:2 task_flags:0x4208060 flags:0x00000010 Workqueue: events_power_efficient reg_check_chans_work Call trace: __switch_to+0x2b0/0x6e0 arch/arm64/kernel/process.c:810 (T) context_switch kernel/sched/core.c:5388 [inline] __schedule+0x1bec/0x2dcc kernel/sched/core.c:7189 __schedule_loop kernel/sched/core.c:7268 [inline] schedule+0x140/0x218 kernel/sched/core.c:7283 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7340 __mutex_lock_common kernel/locking/mutex.c:726 [inline] __mutex_lock+0x4e4/0xef8 kernel/locking/mutex.c:820 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:873 class_wiphy_constructor include/net/cfg80211.h:6645 [inline] reg_leave_invalid_chans net/wireless/reg.c:2454 [inline] reg_check_chans_work+0x14c/0x112c net/wireless/reg.c:2469 process_one_work kernel/workqueue.c:3314 [inline] process_scheduled_works+0x79c/0x1098 kernel/workqueue.c:3397 worker_thread+0x754/0xba0 kernel/workqueue.c:3478 kthread+0x2f8/0x3c8 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842 INFO: task kworker/u8:8:4898 blocked for more than 155 seconds. Tainted: G L syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:8 state:D stack:0 pid:4898 tgid:4898 ppid:2 task_flags:0x4208060 flags:0x00000010 Workqueue: ipv6_addrconf addrconf_verify_work Call trace: __switch_to+0x2b0/0x6e0 arch/arm64/kernel/process.c:810 (T) context_switch kernel/sched/core.c:5388 [inline] __schedule+0x1bec/0x2dcc kernel/sched/core.c:7189 __schedule_loop kernel/sched/core.c:7268 [inline] schedule+0x140/0x218 kernel/sched/core.c:7283 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7340 __mutex_lock_common kernel/locking/mutex.c:726 [inline] __mutex_lock+0x4e4/0xef8 kernel/locking/mutex.c:820 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:873 rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 rtnl_net_lock include/linux/rtnetlink.h:130 [inline] addrconf_verify_work+0x20/0x3c net/ipv6/addrconf.c:4746 process_one_work kernel/workqueue.c:3314 [inline] process_scheduled_works+0x79c/0x1098 kernel/workqueue.c:3397 worker_thread+0x754/0xba0 kernel/workqueue.c:3478 kthread+0x2f8/0x3c8 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842 Showing all locks held in the system: 2 locks held by kworker/0:1/10: 3 locks held by kworker/u8:0/12: 2 locks held by kworker/u8:1/15: 3 locks held by kworker/1:1/26: #0: ffff0000c002b540 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline] #0: ffff0000c002b540 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x748/0x1098 kernel/workqueue.c:3397 #1: ffff80008eba7c40 (deferred_process_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline] #1: ffff80008eba7c40 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0x750/0x1098 kernel/workqueue.c:3397 #2: ffff800089c3bb80 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 1 lock held by khungtaskd/31: #0: ffff800088b672a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #0: ffff800088b672a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #0: ffff800088b672a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x4c/0x188 kernel/locking/lockdep.c:6775 4 locks held by kworker/u8:2/39: #0: ffff0000c004b940 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline] #0: ffff0000c004b940 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_scheduled_works+0x748/0x1098 kernel/workqueue.c:3397 #1: ffff80008fff7c40 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline] #1: ffff80008fff7c40 ((reg_check_chans).work){+.+.}-{0:0}, at: process_scheduled_works+0x750/0x1098 kernel/workqueue.c:3397 #2: ffff800089c3bb80 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 #3: ffff0000d92c0780 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6645 [inline] #3: ffff0000d92c0780 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_leave_invalid_chans net/wireless/reg.c:2454 [inline] #3: ffff0000d92c0780 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_check_chans_work+0x14c/0x112c net/wireless/reg.c:2469 2 locks held by kworker/u8:3/40: #0: ffff0000c004c940 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline] #0: ffff0000c004c940 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_scheduled_works+0x748/0x1098 kernel/workqueue.c:3397 #1: ffff800090007c40 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline] #1: ffff800090007c40 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_scheduled_works+0x750/0x1098 kernel/workqueue.c:3397 3 locks held by pr/ttyAMA-1/41: 2 locks held by kswapd0/71: 6 locks held by kworker/u8:4/227: #0: ffff0000c004e140 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline] #0: ffff0000c004e140 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x748/0x1098 kernel/workqueue.c:3397 #1: ffff8000927c7c40 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline] #1: ffff8000927c7c40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x750/0x1098 kernel/workqueue.c:3397 #2: ffff800089c2e6a8 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x100/0x6b8 net/core/net_namespace.c:673 #3: ffff0000ca72f128 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1040 [inline] #3: ffff0000ca72f128 (&dev->mutex){....}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:124 [inline] #3: ffff0000ca72f128 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0xfc/0x30c net/devlink/core.c:555 #4: ffff0000ca72d258 (&devlink->lock_key#7){+.+.}-{4:4}, at: devl_lock net/devlink/core.c:292 [inline] #4: ffff0000ca72d258 (&devlink->lock_key#7){+.+.}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:125 [inline] #4: ffff0000ca72d258 (&devlink->lock_key#7){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0x110/0x30c net/devlink/core.c:555 #5: ffff800089c3bb80 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 3 locks held by kworker/u8:5/934: 1 lock held by klogd/4327: 1 lock held by udevd/4338: 1 lock held by dhcpcd/4393: 1 lock held by crond/4469: 2 locks held by getty/4487: #0: ffff0000d419b0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009232e2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x354/0xf84 drivers/tty/n_tty.c:2211 1 lock held by syz-executor/4693: 1 lock held by syz-executor/4705: #0: ffff800089c3bb80 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 1 lock held by syz-executor/4709: 1 lock held by syz-executor/4715: 3 locks held by kworker/u8:8/4898: #0: ffff0000ceb4f940 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline] #0: ffff0000ceb4f940 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x748/0x1098 kernel/workqueue.c:3397 #1: ffff800095af7c40 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline] #1: ffff800095af7c40 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x750/0x1098 kernel/workqueue.c:3397 #2: ffff800089c3bb80 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 3 locks held by kworker/u8:10/6263: 4 locks held by kworker/u8:11/8169: 4 locks held by kworker/u8:13/8717: 3 locks held by kworker/u8:14/8721: 3 locks held by kworker/u8:15/8725: 4 locks held by kworker/u8:16/8728: 2 locks held by kworker/u8:17/8729: 3 locks held by kworker/u8:18/8732: 2 locks held by udevd/9431: 3 locks held by modprobe/9537: 4 locks held by kworker/u8:19/9538: 4 locks held by kworker/u8:20/9539: 2 locks held by kworker/u8:22/9541: 2 locks held by syz-executor/9542: 3 locks held by kworker/u8:23/9543: =============================================