INFO: task kworker/u4:10:2973 blocked for more than 140 seconds. Not tainted 4.14.140+ #39 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:10 D26128 2973 2 0x80000000 Workqueue: events_unbound fsnotify_connector_destroy_workfn Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 schedule_timeout+0x752/0xe90 kernel/time/timer.c:1721 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x29c/0x470 kernel/sched/completion.c:123 __synchronize_srcu+0x12a/0x210 kernel/rcu/srcutree.c:898 fsnotify_connector_destroy_workfn+0x49/0xa0 fs/notify/mark.c:156 process_one_work+0x7f1/0x1580 kernel/workqueue.c:2134 worker_thread+0xdd/0xdf0 kernel/workqueue.c:2271 kthread+0x31f/0x430 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404 INFO: task kworker/u4:11:2987 blocked for more than 140 seconds. Not tainted 4.14.140+ #39 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:11 D28368 2987 2 0x80000000 Workqueue: events_unbound fsnotify_mark_destroy_workfn Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 schedule_timeout+0x752/0xe90 kernel/time/timer.c:1721 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x29c/0x470 kernel/sched/completion.c:123 __synchronize_srcu+0x12a/0x210 kernel/rcu/srcutree.c:898 fsnotify_mark_destroy_workfn+0xfd/0x310 fs/notify/mark.c:757 process_one_work+0x7f1/0x1580 kernel/workqueue.c:2134 worker_thread+0xdd/0xdf0 kernel/workqueue.c:2271 kthread+0x31f/0x430 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404 INFO: task syz-executor.3:10579 blocked for more than 140 seconds. Not tainted 4.14.140+ #39 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28624 10579 9767 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 schedule_timeout+0x752/0xe90 kernel/time/timer.c:1721 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x29c/0x470 kernel/sched/completion.c:123 flush_work+0x3e2/0x720 kernel/workqueue.c:2908 fsnotify_destroy_group+0x131/0x2f0 fs/notify/group.c:85 inotify_release+0x33/0x40 fs/notify/inotify/inotify_user.c:280 __fput+0x25e/0x710 fs/file_table.c:210 task_work_run+0x125/0x1a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x13b/0x160 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x3a3/0x520 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x413561 RSP: 002b:00007ffc20c636a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000413561 RDX: 0000001b2e220000 RSI: 0000000000001ddd RDI: 0000000000000003 RBP: 0000000000000001 R08: 00000000076dbddd R09: 00000000076dbde1 R10: 00007ffc20c63780 R11: 0000000000000293 R12: 000000000075c9a0 R13: 000000000075c9a0 R14: 0000000000762528 R15: ffffffffffffffff Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [<00000000d5d9d901>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541 2 locks held by getty/1762: #0: (&tty->ldisc_sem){++++}, at: [<00000000871b5aff>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000000bc7bd4>] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156 2 locks held by kworker/u4:10/2973: #0: ("events_unbound"){+.+.}, at: [<00000000b46dae18>] process_one_work+0x6ff/0x1580 kernel/workqueue.c:2105 #1: (connector_reaper_work){+.+.}, at: [<0000000023bbb7fe>] process_one_work+0x735/0x1580 kernel/workqueue.c:2109 2 locks held by kworker/u4:11/2987: #0: ("events_unbound"){+.+.}, at: [<00000000b46dae18>] process_one_work+0x6ff/0x1580 kernel/workqueue.c:2105 #1: ((reaper_work).work){+.+.}, at: [<0000000023bbb7fe>] process_one_work+0x735/0x1580 kernel/workqueue.c:2109 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.140+ #39 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xca/0x134 lib/dump_stack.c:53 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x119/0x147 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x629/0xbe0 kernel/hung_task.c:274 kthread+0x31f/0x430 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3864 Comm: kworker/1:3 Not tainted 4.14.140+ #39 Workqueue: events rtc_timer_do_work task: 00000000e02110e5 task.stack: 00000000f8fb9aa9 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:lock_acquire+0x170/0x360 kernel/locking/lockdep.c:3994 RSP: 0018:ffff88819ccf7a20 EFLAGS: 00000046 RAX: 0000000000000007 RBX: ffff8881caa9c680 RCX: 1ffff110395539e9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000046 RBP: ffff8881d5ce3008 R08: 000000000000682a R09: 0000000000000003 R10: ffff8881caa9cf28 R11: 8969e1d611d441a5 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881db900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f568c106fe0 CR3: 0000000052826001 CR4: 00000000001606a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x42/0x60 kernel/locking/spinlock.c:160 __wake_up_common_lock+0xb0/0x170 kernel/sched/wait.c:124 rtc_handle_legacy_irq+0x123/0x180 drivers/rtc/interface.c:523 rtc_timer_do_work+0x21d/0x610 drivers/rtc/interface.c:881 process_one_work+0x7f1/0x1580 kernel/workqueue.c:2134 worker_thread+0xdd/0xdf0 kernel/workqueue.c:2271 kthread+0x31f/0x430 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404 Code: ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 7a 01 00 00 c7 83 2c 08 00 00 00 00 00 00 48 8b 3c 24 57 9d <0f> 1f 44 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65