INFO: task blkid:1338 blocked for more than 120 seconds. Not tainted 4.14.0-rc5+ #134 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. blkid D18080 1338 1621 0x80000006 Call Trace: context_switch kernel/sched/core.c:2790 [inline] __schedule+0x8eb/0x2060 kernel/sched/core.c:3366 schedule+0xf5/0x430 kernel/sched/core.c:3425 io_schedule+0x1c/0x70 kernel/sched/core.c:5032 wait_on_page_bit_common mm/filemap.c:1002 [inline] __lock_page+0x574/0x720 mm/filemap.c:1174 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:1776 blkdev_put+0x85/0x4f0 fs/block_dev.c:1847 blkdev_close+0x8b/0xb0 fs/block_dev.c:1854 __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:112 exit_task_work include/linux/task_work.h:21 [inline] do_exit+0x9b5/0x1ad0 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 get_signal+0x73f/0x16d0 kernel/signal.c:2334 do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:808 exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath+0x42f/0x510 arch/x86/entry/common.c:266 entry_SYSCALL_64_fastpath+0xbc/0xbe RIP: 0033:0x7fcacf95b310 RSP: 002b:00007fff576d9a18 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: fffffffffffffffc RBX: 0000000000000000 RCX: 00007fcacf95b310 RDX: 0000000000000400 RSI: 0000000002097c58 RDI: 0000000000000003 RBP: 0000000002097c30 R08: 0000000000000028 R09: 0000000000168000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000002097030 R13: 0000000000000400 R14: 0000000002097080 R15: 0000000002097c48 Showing all locks held in the system: 2 locks held by khungtaskd/643: #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+0xd3/0x400 kernel/locking/lockdep.c:4544 1 lock held by rsyslogd/2864: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x12b/0x190 fs/file.c:767 2 locks held by getty/2947: #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/0x1a00 drivers/tty/n_tty.c:2133 2 locks held by getty/2948: #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/0x1a00 drivers/tty/n_tty.c:2133 2 locks held by getty/2949: #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/0x1a00 drivers/tty/n_tty.c:2133 2 locks held by getty/2950: #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/0x1a00 drivers/tty/n_tty.c:2133 2 locks held by getty/2951: #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/0x1a00 drivers/tty/n_tty.c:2133 2 locks held by getty/2952: #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/0x1a00 drivers/tty/n_tty.c:2133 2 locks held by getty/23876: #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/0x1a00 drivers/tty/n_tty.c:2133 1 lock held by blkid/1338: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_put+0xa7/0x7c0 fs/block_dev.c:1769 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 643 Comm: khungtaskd Not tainted 4.14.0-rc5+ #134 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:137 [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 skipped: idling at pc 0xffffffff84d3ae76