kworker/dying (413) used greatest stack depth: 14216 bytes left INFO: task blkid:761 blocked for more than 120 seconds. Not tainted 4.14.0-rc1+ #93 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. blkid D18048 761 2964 0x80000006 Call Trace: context_switch kernel/sched/core.c:2790 [inline] __schedule+0x8e8/0x2070 kernel/sched/core.c:3366 schedule+0x108/0x440 kernel/sched/core.c:3425 io_schedule+0x1c/0x70 kernel/sched/core.c:5032 wait_on_page_bit_common mm/filemap.c:994 [inline] __lock_page+0x557/0x6f0 mm/filemap.c:1166 lock_page include/linux/pagemap.h:478 [inline] truncate_inode_pages_range+0x123e/0x1cc0 mm/truncate.c:399 truncate_inode_pages+0x24/0x30 mm/truncate.c:429 kill_bdev+0xbc/0xf0 fs/block_dev.c:98 __blkdev_put+0x183/0x7c0 fs/block_dev.c:1774 blkdev_put+0x85/0x4f0 fs/block_dev.c:1845 blkdev_close+0x91/0xc0 fs/block_dev.c:1852 __fput+0x333/0x7f0 fs/file_table.c:210 ____fput+0x15/0x20 fs/file_table.c:244 task_work_run+0x199/0x270 kernel/task_work.c:112 exit_task_work include/linux/task_work.h:21 [inline] do_exit+0xa52/0x1b40 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 get_signal+0x7e8/0x17e0 kernel/signal.c:2334 do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:808 exit_to_usermode_loop+0x224/0x300 arch/x86/entry/common.c:158 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath+0x42f/0x500 arch/x86/entry/common.c:266 entry_SYSCALL_64_fastpath+0xbc/0xbe RIP: 0033:0x7f5b3e1b7310 RSP: 002b:00007fffe26eb378 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: fffffffffffffffc RBX: 0000000000000000 RCX: 00007f5b3e1b7310 RDX: 0000000000000400 RSI: 0000000000d45c58 RDI: 0000000000000003 RBP: 0000000000d45c30 R08: 0000000000000028 R09: 0000000000168000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000d45030 R13: 0000000000000400 R14: 0000000000d45080 R15: 0000000000d45c48 Showing all locks held in the system: 2 locks held by khungtaskd/644: #0: (rcu_read_lock){....}, at: [] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [] watchdog+0x1c5/0xd60 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0xd2/0x410 kernel/locking/lockdep.c:4552 2 locks held by getty/2957: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/2958: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/2959: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/2960: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/2961: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/2962: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 drivers/tty/n_tty.c:2133 1 lock held by blkid/761: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_put+0xa7/0x7c0 fs/block_dev.c:1767 2 locks held by getty/2544: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 drivers/tty/n_tty.c:2133 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 644 Comm: khungtaskd Not tainted 4.14.0-rc1+ #93 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 nmi_cpu_backtrace+0x20e/0x240 lib/nmi_backtrace.c:102 nmi_trigger_cpumask_backtrace+0x122/0x180 lib/nmi_backtrace.c:61 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 trigger_all_cpu_backtrace include/linux/nmi.h:105 [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+0x39c/0x470 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.14.0-rc1+ #93 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801d9f8a300 task.stack: ffff8801d9f90000 RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:772 [inline] RIP: 0010:trace_hardirqs_off_caller+0x1f1/0x2c0 kernel/locking/lockdep.c:2962 RSP: 0018:ffff8801db307cf8 EFLAGS: 00000082 RAX: 0000000000000082 RBX: ffff8801d9f8a300 RCX: 0000000000000000 RDX: 1ffffffff0b59334 RSI: 0000000000000000 RDI: ffffffff85ac99a0 RBP: ffff8801db307d10 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d9f8a300 R13: ffffffff815edaee R14: 0000000000000097 R15: ffff8801d9f8a300 FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000224d000 CR3: 00000001cea51000 CR4: 00000000001406e0 Call Trace: trace_hardirqs_off+0xd/0x10 kernel/locking/lockdep.c:2980 seqcount_lockdep_reader_access include/linux/seqlock.h:79 [inline] read_seqcount_begin include/linux/seqlock.h:163 [inline] ktime_get+0x10e/0x3a0 kernel/time/timekeeping.c:758 tick_nohz_irq_enter kernel/time/tick-sched.c:1144 [inline] tick_irq_enter+0x9e/0x390 kernel/time/tick-sched.c:1165 irq_enter+0xbd/0xe0 kernel/softirq.c:345 scheduler_ipi+0x8c/0x460 kernel/sched/core.c:1784 smp_reschedule_interrupt+0xf2/0x670 arch/x86/kernel/smp.c:277 reschedule_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:794 RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53 RSP: 0018:ffff8801d9f97db0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02 RAX: dffffc0000000000 RBX: 1ffff1003b3f2fb9 RCX: 0000000000000000 RDX: 1ffffffff0b59338 RSI: 0000000000000001 RDI: ffffffff85ac99c0 RBP: ffff8801d9f97db0 R08: ffffffff857b3a68 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff85ac99b0 R13: ffff8801d9f97e68 R14: 0000000000000000 R15: ffff8801d9f8a300 arch_safe_halt arch/x86/include/asm/paravirt.h:93 [inline] default_idle+0xbf/0x460 arch/x86/kernel/process.c:341 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:332 default_idle_call+0x36/0x90 kernel/sched/idle.c:98 cpuidle_idle_call kernel/sched/idle.c:156 [inline] do_idle+0x256/0x3b0 kernel/sched/idle.c:246 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:351 start_secondary+0x2ea/0x3f0 arch/x86/kernel/smpboot.c:277 secondary_startup_64+0xa5/0xa5 arch/x86/kernel/head_64.S:235 Code: 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 cb 00 00 00 48 83 3d 47 c5 58 04 00 0f 84 96 00 00 00 9c 58 <0f> 1f 44 00 00 f6 c4 02 0f 84 df fe ff ff e8 8c b3 e6 00 85 c0