INFO: task kworker/0:6:14042 blocked for more than 143 seconds. Not tainted 5.3.0-rc2+ #82 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:6 D29648 14042 2 0x80004000 Workqueue: events kernfs_notify_workfn Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x755/0x1580 kernel/sched/core.c:3880 schedule+0xa8/0x270 kernel/sched/core.c:3944 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4003 __mutex_lock_common kernel/locking/mutex.c:1007 [inline] __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1077 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1092 kernfs_notify_workfn+0xe0/0x490 fs/kernfs/file.c:882 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 INFO: lockdep is turned off. NMI backtrace for cpu 1 CPU: 1 PID: 1057 Comm: khungtaskd Not tainted 5.3.0-rc2+ #82 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+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b 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:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0x9d0/0xef0 kernel/hung_task.c:289 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 16239 Comm: blkid Not tainted 5.3.0-rc2+ #82 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:select_task_rq kernel/sched/core.c:1988 [inline] RIP: 0010:try_to_wake_up+0x3d6/0x1aa0 kernel/sched/core.c:2508 Code: 48 ff ff ff 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 83 14 00 00 41 83 bf 60 03 00 00 01 <0f> 8e 7a 0c 00 00 49 8d 7f 78 48 b8 00 00 00 00 00 fc ff df 48 89 RSP: 0018:ffff8880ae809c00 EFLAGS: 00000002 RAX: 0000000000000000 RBX: 1ffff11015d0138a RCX: 0000000000000000 RDX: 1ffff1100b463944 RSI: ffff88805a31cb54 RDI: ffff88805a31c71c RBP: ffff8880ae809cd8 R08: 0000000000000000 R09: 0000000000000000 R10: fffffbfff134ada7 R11: ffffffff89a56d3f R12: ffff88805a31c6d0 R13: ffff8880ae809cb0 R14: ffff88805a31c6fc R15: ffff88805a31c6c0 FS: 00007f996f28e740(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f43bd8868d0 CR3: 000000021b35b000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: wake_up_process+0x10/0x20 kernel/sched/core.c:2548 process_timeout+0x31/0x40 kernel/time/timer.c:1736 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers kernel/time/timer.c:1685 [inline] __run_timers kernel/time/timer.c:1653 [inline] run_timer_softirq+0x697/0x17a0 kernel/time/timer.c:1698 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:537 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1095 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:828 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:768 [inline] RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1741 [inline] RIP: 0010:vprintk_emit+0x5df/0x700 kernel/printk/printk.c:1985 Code: 00 48 b8 00 00 00 00 00 fc ff df 41 80 3c 06 00 0f 85 f8 00 00 00 48 83 3d cd c3 76 07 00 74 6a e8 06 71 16 00 48 89 df 57 9d <0f> 1f 44 00 00 e9 06 ff ff ff e8 f2 70 16 00 49 c1 ee 03 e8 c9 ec RSP: 0018:ffff888216367440 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff888088ac2380 RBX: 0000000000000293 RCX: 1ffffffff134b3e6 RDX: 0000000000000000 RSI: ffffffff815c2e4a RDI: 0000000000000293 RBP: ffff888216367488 R08: ffff888088ac2380 R09: fffffbfff134ada8 R10: fffffbfff134ada7 R11: ffffffff89a56d3f R12: 0000000000000050 R13: 0000000000000200 R14: 1ffffffff11a5e42 R15: ffff8880a7ce2380 vprintk_default+0x28/0x30 kernel/printk/printk.c:2013 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:386 printk+0xba/0xed kernel/printk/printk.c:2046 hugetlb_show_meminfo.cold+0xe8/0x138 mm/hugetlb.c:3096 show_free_areas+0xbb5/0xfe0 mm/page_alloc.c:5402 show_mem+0x39/0x19b lib/show_mem.c:18 dump_header+0x176/0x82d mm/oom_kill.c:464 oom_kill_process.cold+0x10/0x15 mm/oom_kill.c:973 out_of_memory mm/oom_kill.c:1109 [inline] out_of_memory+0x79a/0x12c0 mm/oom_kill.c:1042 __alloc_pages_may_oom mm/page_alloc.c:3863 [inline] __alloc_pages_slowpath+0x1ddb/0x2520 mm/page_alloc.c:4575 __alloc_pages_nodemask+0x62e/0x8f0 mm/page_alloc.c:4745 alloc_pages_vma+0xdd/0x560 mm/mempolicy.c:2096 alloc_zeroed_user_highpage_movable include/linux/highmem.h:208 [inline] do_anonymous_page mm/memory.c:2993 [inline] handle_pte_fault mm/memory.c:3838 [inline] __handle_mm_fault+0x1de8/0x3f20 mm/memory.c:3964 handle_mm_fault+0x1b5/0x6b0 mm/memory.c:4001 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline] __do_page_fault+0x536/0xdd0 arch/x86/mm/fault.c:1506 do_page_fault+0x38/0x590 arch/x86/mm/fault.c:1530 page_fault+0x39/0x40 arch/x86/entry/entry_64.S:1200 RIP: 0033:0x7f996ee69c0e Code: Bad RIP value. RSP: 002b:00007fff35d280e0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 00007f996e6eaf10 RCX: 0000000000000002 RDX: 000000000000de00 RSI: 000000000000de00 RDI: 00007f996e6eb000 RBP: 0000000002077eb0 R08: 0000000000000000 R09: 0000000002078116 R10: 0000000000000001 R11: 0000000000000100 R12: 0000000000000001 R13: 0000000000000064 R14: 0000000002078320 R15: 00000000020780e6