INFO: task kworker/u4:2:23 blocked for more than 143 seconds. Not tainted 5.4.0-rc1+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:2 D26216 23 2 0x80004000 Workqueue: events_unbound fsnotify_mark_destroy_workfn Call Trace: context_switch kernel/sched/core.c:3384 [inline] __schedule+0x74b/0xb80 kernel/sched/core.c:4069 schedule+0x131/0x1e0 kernel/sched/core.c:4136 schedule_timeout+0x46/0x240 kernel/time/timer.c:1871 do_wait_for_common+0x2e7/0x4d0 kernel/sched/completion.c:83 __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x47/0x60 kernel/sched/completion.c:136 __synchronize_srcu+0x1d7/0x260 kernel/rcu/srcutree.c:921 synchronize_srcu+0x2cb/0x2f0 kernel/rcu/srcutree.c:999 fsnotify_mark_destroy_workfn+0xe5/0x2a0 fs/notify/mark.c:832 process_one_work+0x7ef/0x10e0 kernel/workqueue.c:2269 process_scheduled_works kernel/workqueue.c:2331 [inline] worker_thread+0xf27/0x1630 kernel/workqueue.c:2417 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Showing all locks held in the system: 2 locks held by kworker/u4:2/23: #0: ffff8880aa4351a8 ((wq_completion)events_unbound){+.+.}, at: spin_unlock_irq include/linux/spinlock.h:388 [inline] #0: ffff8880aa4351a8 ((wq_completion)events_unbound){+.+.}, at: process_one_work+0x75d/0x10e0 kernel/workqueue.c:2242 #1: ffff8880a9a5fd78 ((reaper_work).work){+.+.}, at: process_one_work+0x79f/0x10e0 kernel/workqueue.c:2244 2 locks held by kworker/u4:3/33: #0: ffff8880aa4351a8 ((wq_completion)events_unbound){+.+.}, at: spin_unlock_irq include/linux/spinlock.h:388 [inline] #0: ffff8880aa4351a8 ((wq_completion)events_unbound){+.+.}, at: process_one_work+0x75d/0x10e0 kernel/workqueue.c:2242 #1: ffff8880a9ad7d78 (connector_reaper_work){+.+.}, at: process_one_work+0x79f/0x10e0 kernel/workqueue.c:2244 1 lock held by khungtaskd/1070: #0: ffffffff888d3ec0 (rcu_read_lock){....}, at: rcu_lock_acquire+0x4/0x30 include/linux/rcupdate.h:207 3 locks held by udevd/3899: 1 lock held by rsyslogd/7696: #0: ffff888099b94660 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x243/0x2e0 fs/file.c:801 2 locks held by getty/7786: #0: ffff88809bfc8610 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f532e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7787: #0: ffff888095c16590 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f452e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7788: #0: ffff888097756650 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f632e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7789: #0: ffff888097756ed0 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f5f2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7790: #0: ffff888097757750 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f572e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7791: #0: ffff888094c51790 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f5b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7792: #0: ffff88809a9aebd0 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f312e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 3 locks held by kworker/1:4/7918: 3 locks held by kworker/0:4/7919: 2 locks held by kworker/0:5/8464: 3 locks held by kworker/0:6/11172: 3 locks held by syz-executor.5/14577: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1070 Comm: khungtaskd Not tainted 5.4.0-rc1+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x2f8 lib/dump_stack.c:113 nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace+0x17/0x20 include/linux/nmi.h:146 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xbb9/0xbd0 kernel/hung_task.c:289 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 7918 Comm: kworker/1:4 Not tainted 5.4.0-rc1+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events bpf_prog_free_deferred RIP: 0010:ktime_get_update_offsets_now+0x19a/0x250 kernel/time/timekeeping.c:2236 Code: 07 48 8b 4d c0 48 89 c8 48 c1 e8 03 42 80 3c 28 00 74 0d 48 8b 7d c0 e8 74 27 48 00 48 8b 4d c0 48 89 19 48 8b 1d 16 3c 29 07 <4c> 89 f7 48 89 de e8 8b f4 0e 00 49 39 de 7d 14 e8 81 f2 0e 00 44 RSP: 0018:ffff8880aeb09e38 EFLAGS: 00000006 RAX: ffffffff8164469f RBX: 7fffffffffffffff RCX: ffff888094836480 RDX: 0000000080010002 RSI: 0000000000000004 RDI: 0000000000000004 RBP: ffff8880aeb09e88 R08: ffffffff81644695 R09: fffffbfff117cbfd R10: fffffbfff117cbfd R11: 0000000000000000 R12: 0000000000013386 R13: dffffc0000000000 R14: 0000005f0ac51573 R15: ffff8880aeb26d58 FS: 0000000000000000(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1706d1b518 CR3: 0000000089ee6000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: hrtimer_update_base kernel/time/hrtimer.c:598 [inline] hrtimer_interrupt+0x110/0xda0 kernel/time/hrtimer.c:1620 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:756 [inline] RIP: 0010:console_trylock_spinning+0x31f/0x390 kernel/printk/printk.c:1751 Code: c1 e8 03 42 80 3c 38 00 74 0c 48 c7 c7 70 91 8a 88 e8 a5 e6 4f 00 48 83 3d fd 09 2e 07 00 74 69 e8 66 b2 16 00 4c 89 f7 57 9d <0f> 1f 44 00 00 bb 01 00 00 00 48 c7 c7 d8 25 8d 88 31 f6 ba 01 00 RSP: 0018:ffff8880812ffb10 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: ffffffff815c877a RBX: 0000000000000001 RCX: ffff888094836480 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000286 RBP: ffff8880812ffb30 R08: ffff888094836cd8 R09: fffffbfff12bbcb8 R10: fffffbfff12bbcb8 R11: 0000000000000000 R12: 00000000ffffff00 R13: 0000000000011fec R14: 0000000000000286 R15: dffffc0000000000 vprintk_emit+0x21c/0x3a0 kernel/printk/printk.c:1995 vprintk_default+0x28/0x30 kernel/printk/printk.c:2023 vprintk_func+0x158/0x170 kernel/printk/printk_safe.c:386 printk+0x62/0x8d kernel/printk/printk.c:2056 bpf_jit_free+0x194/0x250 bpf_prog_free_deferred+0x1d7/0x400 kernel/bpf/core.c:1994 process_one_work+0x7ef/0x10e0 kernel/workqueue.c:2269 worker_thread+0xc01/0x1630 kernel/workqueue.c:2415 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352