INFO: task kworker/1:2:2038 blocked for more than 120 seconds. Not tainted 4.16.0-rc6+ #285 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/1:2 D20096 2038 2 0x80000000 Workqueue: events_power_efficient reg_check_chans_work Call Trace: context_switch kernel/sched/core.c:2862 [inline] __schedule+0x8fb/0x1ec0 kernel/sched/core.c:3440 schedule+0xf5/0x430 kernel/sched/core.c:3499 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3557 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0xaad/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 reg_check_chans_work+0xaa/0xff0 net/wireless/reg.c:2017 process_one_work+0xc47/0x1bb0 kernel/workqueue.c:2113 worker_thread+0x223/0x1990 kernel/workqueue.c:2247 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406 Showing all locks held in the system: 3 locks held by kworker/0:1/24: #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000092d323b8>] work_static include/linux/workqueue.h:198 [inline] #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000092d323b8>] set_work_data kernel/workqueue.c:619 [inline] #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000092d323b8>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000092d323b8>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084 #1: ((addr_chk_work).work){+.+.}, at: [<00000000d2fed9a3>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088 #2: (rtnl_mutex){+.+.}, at: [<00000000530b9559>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 2 locks held by khungtaskd/868: #0: (rcu_read_lock){....}, at: [<000000009523d88e>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [<000000009523d88e>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [<0000000074894a9b>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470 3 locks held by kworker/1:2/2038: #0: ((wq_completion)"events_power_efficient"){+.+.}, at: [<0000000092d323b8>] work_static include/linux/workqueue.h:198 [inline] #0: ((wq_completion)"events_power_efficient"){+.+.}, at: [<0000000092d323b8>] set_work_data kernel/workqueue.c:619 [inline] #0: ((wq_completion)"events_power_efficient"){+.+.}, at: [<0000000092d323b8>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ((wq_completion)"events_power_efficient"){+.+.}, at: [<0000000092d323b8>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084 #1: ((reg_check_chans).work){+.+.}, at: [<00000000d2fed9a3>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088 #2: (rtnl_mutex){+.+.}, at: [<00000000530b9559>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 1 lock held by rsyslogd/4328: #0: (&f->f_pos_lock){+.+.}, at: [<00000000d53e6a7c>] __fdget_pos+0x12b/0x190 fs/file.c:765 2 locks held by getty/4418: #0: (&tty->ldisc_sem){++++}, at: [<000000008f2da389>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000060e24ab4>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4419: #0: (&tty->ldisc_sem){++++}, at: [<000000008f2da389>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000060e24ab4>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4420: #0: (&tty->ldisc_sem){++++}, at: [<000000008f2da389>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000060e24ab4>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4421: #0: (&tty->ldisc_sem){++++}, at: [<000000008f2da389>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000060e24ab4>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4422: #0: (&tty->ldisc_sem){++++}, at: [<000000008f2da389>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000060e24ab4>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4423: #0: (&tty->ldisc_sem){++++}, at: [<000000008f2da389>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000060e24ab4>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4424: #0: (&tty->ldisc_sem){++++}, at: [<000000008f2da389>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000060e24ab4>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 4 locks held by kworker/u4:12/6183: #0: ((wq_completion)"%s""netns"){+.+.}, at: [<0000000092d323b8>] work_static include/linux/workqueue.h:198 [inline] #0: ((wq_completion)"%s""netns"){+.+.}, at: [<0000000092d323b8>] set_work_data kernel/workqueue.c:619 [inline] #0: ((wq_completion)"%s""netns"){+.+.}, at: [<0000000092d323b8>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ((wq_completion)"%s""netns"){+.+.}, at: [<0000000092d323b8>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084 #1: (net_cleanup_work){+.+.}, at: [<00000000d2fed9a3>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088 #2: (pernet_ops_rwsem){++++}, at: [<00000000bc4a93ea>] cleanup_net+0x11b/0xa70 net/core/net_namespace.c:485 #3: (rtnl_mutex){+.+.}, at: [<00000000530b9559>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 1 lock held by syz-executor6/11012: #0: (ipvs->sync_mutex){+.+.}, at: [<000000006f0cd78a>] do_ip_vs_set_ctl+0x277/0x1cc0 net/netfilter/ipvs/ip_vs_ctl.c:2393 2 locks held by syz-executor6/11032: #0: (rtnl_mutex){+.+.}, at: [<00000000530b9559>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 #1: (ipvs->sync_mutex){+.+.}, at: [<0000000045bb4ef8>] do_ip_vs_set_ctl+0x10f8/0x1cc0 net/netfilter/ipvs/ip_vs_ctl.c:2388 1 lock held by syz-executor6/11033: #0: (ipvs->sync_mutex){+.+.}, at: [<000000006f0cd78a>] do_ip_vs_set_ctl+0x277/0x1cc0 net/netfilter/ipvs/ip_vs_ctl.c:2393 1 lock held by ipvs-b:7:0/11014: #0: (rtnl_mutex){+.+.}, at: [<00000000530b9559>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 2 locks held by syz-executor5/11029: #0: (vlan_ioctl_mutex){+.+.}, at: [<00000000495615c4>] sock_ioctl+0x50a/0x670 net/socket.c:1057 #1: (rtnl_mutex){+.+.}, at: [<00000000530b9559>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 1 lock held by syz-executor7/11048: #0: (rtnl_mutex){+.+.}, at: [<00000000530b9559>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 2 locks held by syz-executor7/11058: #0: (br_ioctl_mutex){+.+.}, at: [<000000005cdbc162>] sock_ioctl+0x2fe/0x670 net/socket.c:1046 #1: (rtnl_mutex){+.+.}, at: [<00000000530b9559>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 1 lock held by syz-executor3/11062: #0: (rtnl_mutex){+.+.}, at: [<00000000530b9559>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 1 lock held by syz-executor3/11068: #0: (rtnl_mutex){+.+.}, at: [<00000000530b9559>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 1 lock held by syz-executor4/11057: #0: (rtnl_mutex){+.+.}, at: [<00000000530b9559>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 1 lock held by syz-executor4/11069: #0: (rtnl_mutex){+.+.}, at: [<00000000530b9559>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 868 Comm: khungtaskd Not tainted 4.16.0-rc6+ #285 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x123/0x180 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_task kernel/hung_task.c:132 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] watchdog+0x90c/0xd60 kernel/hung_task.c:249 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54