kworker/dying (5) used greatest stack depth: 12464 bytes left INFO: task blkid:6478 blocked for more than 120 seconds. Not tainted 4.15.0+ #195 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. blkid D20976 6478 4140 0x80000006 Call Trace: context_switch kernel/sched/core.c:2799 [inline] __schedule+0x8eb/0x2060 kernel/sched/core.c:3375 schedule+0xf5/0x430 kernel/sched/core.c:3434 io_schedule+0x1c/0x70 kernel/sched/core.c:5042 wait_on_page_bit_common mm/filemap.c:1100 [inline] __lock_page+0x574/0x720 mm/filemap.c:1273 lock_page include/linux/pagemap.h:483 [inline] truncate_inode_pages_range+0x1945/0x1f90 mm/truncate.c:452 truncate_inode_pages+0x24/0x30 mm/truncate.c:482 kill_bdev+0xbc/0xf0 fs/block_dev.c:86 __blkdev_put+0x198/0x7f0 fs/block_dev.c:1764 blkdev_put+0x85/0x4f0 fs/block_dev.c:1835 blkdev_close+0x8b/0xb0 fs/block_dev.c:1842 __fput+0x327/0x7e0 fs/file_table.c:210 ____fput+0x15/0x20 fs/file_table.c:244 task_work_run+0x199/0x270 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x9bb/0x1ad0 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 get_signal+0x73f/0x16c0 kernel/signal.c:2335 do_signal+0x90/0x1eb0 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264 entry_SYSCALL_64_fastpath+0x9e/0xa0 RIP: 0033:0x7fde83f05310 RSP: 002b:00007ffe79682318 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: fffffffffffffffc RBX: 0000000000000000 RCX: 00007fde83f05310 RDX: 0000000000000400 RSI: 0000000000891c58 RDI: 0000000000000003 RBP: 0000000000891c30 R08: 0000000000000028 R09: 0000000001680000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000891030 R13: 0000000000000400 R14: 0000000000891080 R15: 0000000000891c48 Showing all locks held in the system: 2 locks held by khungtaskd/759: #0: (rcu_read_lock){....}, at: [<00000000526326dd>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [<00000000526326dd>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [<000000007e646956>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4465 1 lock held by rsyslogd/4011: #0: (&f->f_pos_lock){+.+.}, at: [<00000000c38703ab>] __fdget_pos+0x12b/0x190 fs/file.c:770 2 locks held by getty/4133: #0: (&tty->ldisc_sem){++++}, at: [<00000000927439dd>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000003b89507d>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131 2 locks held by getty/4134: #0: (&tty->ldisc_sem){++++}, at: [<00000000927439dd>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000003b89507d>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131 2 locks held by getty/4135: #0: (&tty->ldisc_sem){++++}, at: [<00000000927439dd>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000003b89507d>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131 2 locks held by getty/4136: #0: (&tty->ldisc_sem){++++}, at: [<00000000927439dd>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000003b89507d>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131 2 locks held by getty/4137: #0: (&tty->ldisc_sem){++++}, at: [<00000000927439dd>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000003b89507d>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131 2 locks held by getty/4138: #0: (&tty->ldisc_sem){++++}, at: [<00000000927439dd>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000003b89507d>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131 2 locks held by getty/5239: #0: (&tty->ldisc_sem){++++}, at: [<00000000927439dd>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000003b89507d>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131 1 lock held by blkid/6478: #0: (&bdev->bd_mutex){+.+.}, at: [<0000000068b1d5f6>] __blkdev_put+0xbc/0x7f0 fs/block_dev.c:1757 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 759 Comm: khungtaskd Not tainted 4.15.0+ #195 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+0x194/0x257 lib/dump_stack.c:53 nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x122/0x180 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:541 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.15.0+ #195 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:trace_softirqs_on+0xc0/0x3b0 kernel/locking/lockdep.c:2942 RSP: 0018:ffff8801db507d00 EFLAGS: 00000806 RAX: ffffffff88139240 RBX: ffff8801d9f10300 RCX: 0000000000000001 RDX: 0000000000000004 RSI: ffff8801db526360 RDI: ffffffff88139240 RBP: ffff8801db507d18 R08: 0000000000000001 R09: ffff88021fff8048 R10: ffff88021fff8050 R11: ffff88021fff805d R12: ffff8801d9f10300 R13: ffffffff8142af2c R14: ffff8801db507e68 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000007b9460 CR3: 0000000006a22002 CR4: 00000000001606e0 Call Trace: __local_bh_enable+0x10b/0x130 kernel/softirq.c:143 _local_bh_enable+0x1c/0x30 kernel/softirq.c:155 irq_enter+0xbb/0xd0 kernel/softirq.c:347 scheduler_ipi+0x23d/0x820 kernel/sched/core.c:1793 smp_reschedule_interrupt+0xe6/0x670 arch/x86/kernel/smp.c:277 reschedule_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:961 RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54 RSP: 0018:ffff8801d9f1fcb0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02 RAX: dffffc0000000000 RBX: 1ffff1003b3e3f99 RCX: 0000000000000000 RDX: 1ffffffff0d59198 RSI: 0000000000000001 RDI: ffffffff86ac8cc0 RBP: ffff8801d9f1fcb0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: ffff8801d9f1fd68 R14: ffffffff8725b4e0 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:93 [inline] default_idle+0xbf/0x460 arch/x86/kernel/process.c:355 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:346 default_idle_call+0x36/0x90 kernel/sched/idle.c:98 cpuidle_idle_call kernel/sched/idle.c:156 [inline] do_idle+0x24a/0x3b0 kernel/sched/idle.c:246 cpu_startup_entry+0x104/0x120 kernel/sched/idle.c:351 start_secondary+0x40a/0x590 arch/x86/kernel/smpboot.c:268 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237 Code: 74 08 00 00 85 ff 0f 85 da 01 00 00 48 c7 c7 40 92 13 88 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 <83> e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 74 02 00 00 8b 35 28