INFO: task blkid:12306 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           D19040 12306   3004 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: 0033:0x7fb8678d9310
RSP: 002b:00007ffd1140acd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: fffffffffffffffc RBX: 0000000000000000 RCX: 00007fb8678d9310
RDX: 0000000000000400 RSI: 000000000200ac58 RDI: 0000000000000003
RBP: 000000000200ac30 R08: 0000000000000028 R09: 0000000000200000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000200a030
R13: 0000000000000400 R14: 000000000200a080 R15: 000000000200ac48
INFO: lockdep is turned off.
NMI backtrace for cpu 2
CPU: 2 PID: 657 Comm: khungtaskd Not tainted 4.13.0-rc4-next-20170811 #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 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 2 to CPUs 0-1,3:
NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff84d66e06
NMI backtrace for cpu 3 skipped: idling at pc 0xffffffff84d66e06
NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff84d66e06