kworker/dying (3465) used greatest stack depth: 11840 bytes left INFO: task blkid:16464 blocked for more than 120 seconds. Not tainted 4.13.0-rc4-next-20170811 #2 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. blkid D18336 16464 3006 0x80000006 Call Trace: context_switch kernel/sched/core.c:2786 [inline] __schedule+0x8e8/0x2070 kernel/sched/core.c:3362 schedule+0x108/0x440 kernel/sched/core.c:3422 io_schedule+0x1c/0x70 kernel/sched/core.c:5030 wait_on_page_bit_common mm/filemap.c:973 [inline] __lock_page+0x566/0x700 mm/filemap.c:1144 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:1771 blkdev_put+0x85/0x4f0 fs/block_dev.c:1842 blkdev_close+0x8b/0xb0 fs/block_dev.c:1849 __fput+0x327/0x7e0 fs/file_table.c:210 ____fput+0x15/0x20 fs/file_table.c:246 task_work_run+0x199/0x270 kernel/task_work.c:112 exit_task_work include/linux/task_work.h:21 [inline] do_exit+0xa52/0x1b30 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 get_signal+0x7e8/0x17e0 kernel/signal.c:2330 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: 0033:0x7fc72c890310 RSP: 002b:00007fff3fe137f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: fffffffffffffffc RBX: 0000000000000000 RCX: 00007fc72c890310 RDX: 0000000000000400 RSI: 000000000158ec58 RDI: 0000000000000003 RBP: 000000000158ec30 R08: 0000000000000028 R09: 0000000000168000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000158e030 R13: 0000000000000400 R14: 000000000158e080 R15: 000000000158ec48 Showing all locks held in the system: 2 locks held by khungtaskd/639: #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/2999: #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+0x2ef/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/3000: #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+0x2ef/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/3001: #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+0x2ef/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/3002: #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+0x2ef/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/3003: #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+0x2ef/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/3004: #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+0x2ef/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/3005: #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+0x2ef/0x1a40 drivers/tty/n_tty.c:2133 1 lock held by blkid/16464: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_put+0xa7/0x7c0 fs/block_dev.c:1764 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 639 Comm: khungtaskd Not tainted 4.13.0-rc4-next-20170811 #2 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+0x35e/0x430 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.13.0-rc4-next-20170811 #2 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffffffff85a2c380 task.stack: ffffffff85a00000 RIP: 0010:__wrmsr arch/x86/include/asm/msr.h:104 [inline] RIP: 0010:native_apic_msr_eoi_write+0xf/0x20 arch/x86/include/asm/apic.h:197 RSP: 0018:ffff8801db207fd0 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffffffff857efec0 RCX: 000000000000080b RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000000b0 RBP: ffff8801db207fd0 R08: ffffffff857efa80 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff85ac6ad0 R13: ffffffff85a07d98 R14: 0000000000000000 R15: ffffffff85a2c380 FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000159c000 CR3: 00000001d30d9000 CR4: 00000000001406f0 DR0: 0000000020001010 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: apic_eoi arch/x86/include/asm/apic.h:399 [inline] ack_APIC_irq arch/x86/include/asm/apic.h:443 [inline] smp_reschedule_interrupt+0x55/0x80 arch/x86/kernel/smp.c:267 reschedule_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:807 RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53 RSP: 0018:ffffffff85a07ce0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02 RAX: dffffc0000000000 RBX: 1ffffffff0b40f9f RCX: 0000000000000000 RDX: 1ffffffff0b58d5c RSI: 0000000000000001 RDI: ffffffff85ac6ae0 RBP: ffffffff85a07ce0 R08: ffffffff857efa80 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff85ac6ad0 R13: ffffffff85a07d98 R14: 0000000000000000 R15: ffffffff85a2c380 arch_safe_halt arch/x86/include/asm/paravirt.h:98 [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 rest_init+0xed/0xf0 init/main.c:435 start_kernel+0x74a/0x770 init/main.c:708 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:378 x86_64_start_kernel+0x13c/0x149 arch/x86/kernel/head64.c:359 secondary_startup_64+0xa5/0xa5 arch/x86/kernel/head_64.S:235 Code: ff 90 66 2e 0f 1f 84 00 00 00 00 00 55 be 01 00 00 00 48 89 e5 e8 d2 14 2c 00 5d c3 55 31 c0 b9 0b 08 00 00 89 c2 48 89 e5 0f 30 <5d> c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5