IPVS: stopping backup sync thread 6634 ... IPVS: sync thread started: state = BACKUP, mcast_ifn = sit0, syncid = 0, id = 0 INFO: task kworker/1:2:1823 blocked for more than 120 seconds. Not tainted 4.9.90-gdd1e37e #6 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/1:2 D27648 1823 2 0x00000000 Workqueue: events_power_efficient reg_check_chans_work ffff8801cea6b000 0000000000000000 ffff8801b6188fc0 ffff8801d9b73000 ffff8801db321b98 ffff8801ceab7a08 ffffffff838a75cb 0000000000000002 0000000000000007 00ff8801cea6b000 ffff8801db322468 ffff8801db322490 Call Trace: [] schedule+0x7f/0x1b0 kernel/sched/core.c:3551 [] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3584 [] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [] mutex_lock_nested+0x312/0x870 kernel/locking/mutex.c:621 [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 [] reg_check_chans_work+0x74/0xde0 net/wireless/reg.c:1652 [] process_one_work+0x7e0/0x1610 kernel/workqueue.c:2092 [] worker_thread+0xe0/0x10d0 kernel/workqueue.c:2226 [] kthread+0x26d/0x300 kernel/kthread.c:211 [] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 Showing all locks held in the system: 3 locks held by kworker/1:1/25: #0: ("%s"("ipv6_addrconf")){.+.+..}, at: [] work_static include/linux/workqueue.h:186 [inline] #0: ("%s"("ipv6_addrconf")){.+.+..}, at: [] set_work_data kernel/workqueue.c:617 [inline] #0: ("%s"("ipv6_addrconf")){.+.+..}, at: [] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ("%s"("ipv6_addrconf")){.+.+..}, at: [] process_one_work+0x6f2/0x1610 kernel/workqueue.c:2085 #1: ((addr_chk_work).work){+.+...}, at: [] process_one_work+0x72c/0x1610 kernel/workqueue.c:2089 #2: (rtnl_mutex){+.+.+.}, at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 2 locks held by khungtaskd/514: #0: (rcu_read_lock){......}, at: [] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline] #0: (rcu_read_lock){......}, at: [] watchdog+0x125/0xa70 kernel/hung_task.c:239 #1: (tasklist_lock){.+.+..}, at: [] debug_show_all_locks+0x70/0x280 kernel/locking/lockdep.c:4336 3 locks held by kworker/1:2/1823: #0: ("events_power_efficient"){.+.+.+}, at: [] work_static include/linux/workqueue.h:186 [inline] #0: ("events_power_efficient"){.+.+.+}, at: [] set_work_data kernel/workqueue.c:617 [inline] #0: ("events_power_efficient"){.+.+.+}, at: [] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ("events_power_efficient"){.+.+.+}, at: [] process_one_work+0x6f2/0x1610 kernel/workqueue.c:2085 #1: ((reg_check_chans).work){+.+...}, at: [] process_one_work+0x72c/0x1610 kernel/workqueue.c:2089 #2: (rtnl_mutex){+.+.+.}, at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 1 lock held by rsyslogd/3653: #0: (&f->f_pos_lock){+.+.+.}, at: [] __fdget_pos+0x9f/0xc0 fs/file.c:781 2 locks held by getty/3782: #0: (&tty->ldisc_sem){++++++}, at: [] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+...}, at: [] n_tty_read+0x1f4/0x16c0 drivers/tty/n_tty.c:2133 1 lock held by syz-executor2/6628: #0: (ipvs->sync_mutex){+.+.+.}, at: [] do_ip_vs_set_ctl+0x240/0xc00 net/netfilter/ipvs/ip_vs_ctl.c:2402 2 locks held by syz-executor2/6636: #0: (rtnl_mutex){+.+.+.}, at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 #1: (ipvs->sync_mutex){+.+.+.}, at: [] do_ip_vs_set_ctl+0x8e7/0xc00 net/netfilter/ipvs/ip_vs_ctl.c:2397 1 lock held by ipvs-b:9:0/6634: #0: (rtnl_mutex){+.+.+.}, at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 1 lock held by syz-executor1/6642: #0: (rtnl_mutex){+.+.+.}, at: [] rtnl_lock net/core/rtnetlink.c:70 [inline] #0: (rtnl_mutex){+.+.+.}, at: [] rtnetlink_rcv+0x1b/0x40 net/core/rtnetlink.c:4064 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 514 Comm: khungtaskd Not tainted 4.9.90-gdd1e37e #6 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801d86cfd00 ffffffff81d94ee9 0000000000000000 0000000000000001 0000000000000001 0000000000000001 ffffffff810bb920 ffff8801d86cfd38 ffffffff81da000d 0000000000000001 0000000000000000 ffff8801cea6b418 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] nmi_cpu_backtrace+0xfd/0x120 lib/nmi_backtrace.c:99 [] nmi_trigger_cpumask_backtrace+0x117/0x190 lib/nmi_backtrace.c:60 [] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [] check_hung_task kernel/hung_task.c:125 [inline] [] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline] [] watchdog+0x6f0/0xa70 kernel/hung_task.c:239 [] kthread+0x26d/0x300 kernel/kthread.c:211 [] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff838b7116