random: crng init done
Buffer I/O error on dev loop0, logical block 0, lost async page write
INFO: task blkid:5387 blocked for more than 120 seconds.
      Not tainted 4.9.88-gbb52bba #59
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid           D27744  5387   2273 0x00000004
 ffff8801b0323000 ffff8801befa3480 ffff8801c1891f80 ffff8801bee6e000
 ffff8801db321b98 ffff8801b03574e0 ffffffff838a69cb 0000000041b58ab3
 ffffffff84194260 00ffffff8123c410 ffff8801db322468 ffff8801db322490
Call Trace:
 [<ffffffff838a7f6f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3550
 [<ffffffff838b40cc>] schedule_timeout+0x56c/0x10b0 kernel/time/timer.c:1768
 [<ffffffff838a617e>] io_schedule_timeout+0x1be/0x390 kernel/sched/core.c:5172
 [<ffffffff838a93e9>] io_schedule include/linux/sched.h:460 [inline]
 [<ffffffff838a93e9>] bit_wait_io+0x19/0xa0 kernel/sched/wait.c:582
 [<ffffffff838a8c52>] __wait_on_bit_lock+0xc2/0x1c0 kernel/sched/wait.c:421
 [<ffffffff8143330f>] __lock_page+0xff/0x160 mm/filemap.c:934
 [<ffffffff8145cbc3>] lock_page include/linux/pagemap.h:454 [inline]
 [<ffffffff8145cbc3>] write_cache_pages+0x833/0xec0 mm/page-writeback.c:2214
 [<ffffffff8145d32a>] generic_writepages+0xda/0x150 mm/page-writeback.c:2333
 [<ffffffff8162bdad>] blkdev_writepages+0x1d/0x30 fs/block_dev.c:1764
 [<ffffffff8145fced>] do_writepages+0xed/0x1c0 mm/page-writeback.c:2347
 [<ffffffff8143b893>] __filemap_fdatawrite_range+0x1b3/0x250 mm/filemap.c:390
 [<ffffffff8143b9c1>] __filemap_fdatawrite mm/filemap.c:398 [inline]
 [<ffffffff8143b9c1>] filemap_fdatawrite mm/filemap.c:403 [inline]
 [<ffffffff8143b9c1>] filemap_write_and_wait+0x61/0x120 mm/filemap.c:543
 [<ffffffff8162dff0>] __sync_blockdev fs/block_dev.c:194 [inline]
 [<ffffffff8162dff0>] sync_blockdev.part.28+0x50/0x70 fs/block_dev.c:203
 [<ffffffff8162e614>] sync_blockdev fs/block_dev.c:190 [inline]
 [<ffffffff8162e614>] __blkdev_put+0x184/0x7e0 fs/block_dev.c:1585
 [<ffffffff8162fa45>] blkdev_put+0x85/0x550 fs/block_dev.c:1663
 [<ffffffff8162ff9b>] blkdev_close+0x8b/0xb0 fs/block_dev.c:1670
 [<ffffffff81575f6c>] __fput+0x28c/0x6e0 fs/file_table.c:208
 [<ffffffff81576445>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff81195f05>] task_work_run+0x115/0x190 kernel/task_work.c:116
 [<ffffffff8100500c>] tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 [<ffffffff8100500c>] exit_to_usermode_loop+0xfc/0x120 arch/x86/entry/common.c:161
 [<ffffffff810066cf>] prepare_exit_to_usermode arch/x86/entry/common.c:191 [inline]
 [<ffffffff810066cf>] syscall_return_slowpath arch/x86/entry/common.c:260 [inline]
 [<ffffffff810066cf>] do_syscall_64+0x36f/0x490 arch/x86/entry/common.c:287
 [<ffffffff838b7a53>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
3 locks held by kworker/u4:1/22:
 #0:  ("writeback"){.+.+.+}, at: [<ffffffff81189e62>] work_static include/linux/workqueue.h:186 [inline]
 #0:  ("writeback"){.+.+.+}, at: [<ffffffff81189e62>] set_work_data kernel/workqueue.c:617 [inline]
 #0:  ("writeback"){.+.+.+}, at: [<ffffffff81189e62>] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0:  ("writeback"){.+.+.+}, at: [<ffffffff81189e62>] process_one_work+0x6f2/0x1610 kernel/workqueue.c:2085
 #1:  ((&(&wb->dwork)->work)){+.+.+.}, at: [<ffffffff81189e9c>] process_one_work+0x72c/0x1610 kernel/workqueue.c:2089
 #2:  (&type->s_umount_key#22){.+.+..}, at: [<ffffffff8157a480>] trylock_super+0x20/0x100 fs/super.c:393
2 locks held by khungtaskd/515:
 #0:  (rcu_read_lock){......}, at: [<ffffffff813735a5>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff813735a5>] watchdog+0x125/0xa70 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81238570>] debug_show_all_locks+0x70/0x280 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3587:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d43cf>] __fdget_pos+0x9f/0xc0 fs/file.c:781
2 locks held by getty/3714:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff838b5c42>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8200b3a4>] n_tty_read+0x1f4/0x16c0 drivers/tty/n_tty.c:2133
1 lock held by blkid/5387:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8162e54c>] __blkdev_put+0xbc/0x7e0 fs/block_dev.c:1579
1 lock held by syz-executor5/5440:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8162ed7c>] __blkdev_get+0x10c/0xd50 fs/block_dev.c:1268

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 515 Comm: khungtaskd Not tainted 4.9.88-gbb52bba #59
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d84dfd00 ffffffff81d95f19 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810bb450 ffff8801d84dfd38
 ffffffff81da103d 0000000000000000 0000000000000000 ffff8801b0323418
Call Trace:
 [<ffffffff81d95f19>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d95f19>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81da103d>] nmi_cpu_backtrace+0xfd/0x120 lib/nmi_backtrace.c:99
 [<ffffffff81da1177>] nmi_trigger_cpumask_backtrace+0x117/0x190 lib/nmi_backtrace.c:60
 [<ffffffff810bb544>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81373b70>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81373b70>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81373b70>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81373b70>] watchdog+0x6f0/0xa70 kernel/hung_task.c:239
 [<ffffffff8119ae6d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff838b7c1c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff838b66b6