Buffer I/O error on dev loop0, logical block 10, lost async page write
random: crng init done
INFO: task syz-executor3:5444 blocked for more than 120 seconds.
      Not tainted 4.9.92-g4fb542f #2
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3   D26120  5444   3796 0x20020006
 ffff8801bc610000 ffff8801c5455f80 ffff8801bd39af40 ffff8801d8abc800
 ffff8801db221b98 ffff8801d909f540 ffffffff838c49cd 0000000041b58ab3
 ffffffff841a4570 ffffffff81233c60 00fff1003b213e9f ffff8801db222468
Call Trace:
 [<ffffffff838c5fcf>] schedule+0x7f/0x1b0 kernel/sched/core.c:3556
 [<ffffffff838d23e1>] schedule_timeout+0x861/0xf70 kernel/time/timer.c:1768
 [<ffffffff838c41aa>] io_schedule_timeout+0x1ba/0x390 kernel/sched/core.c:5178
 [<ffffffff838c7419>] io_schedule include/linux/sched.h:460 [inline]
 [<ffffffff838c7419>] bit_wait_io+0x19/0xa0 kernel/sched/wait.c:582
 [<ffffffff838c6b63>] __wait_on_bit+0x93/0x120 kernel/sched/wait.c:383
 [<ffffffff81431fe0>] wait_on_page_bit+0x130/0x140 mm/filemap.c:802
 [<ffffffff814321b1>] wait_on_page_writeback include/linux/pagemap.h:526 [inline]
 [<ffffffff814321b1>] __filemap_fdatawait_range+0x1c1/0x290 mm/filemap.c:453
 [<ffffffff814322a5>] filemap_fdatawait_range+0x25/0x50 mm/filemap.c:483
 [<ffffffff8143aeb5>] filemap_fdatawait mm/filemap.c:533 [inline]
 [<ffffffff8143aeb5>] filemap_write_and_wait+0xf5/0x130 mm/filemap.c:551
 [<ffffffff8162e356>] __sync_blockdev fs/block_dev.c:194 [inline]
 [<ffffffff8162e356>] sync_blockdev fs/block_dev.c:203 [inline]
 [<ffffffff8162e356>] __blkdev_put+0x1d6/0x840 fs/block_dev.c:1585
 [<ffffffff8162f7a5>] blkdev_put+0x85/0x560 fs/block_dev.c:1663
 [<ffffffff8162fd0b>] blkdev_close+0x8b/0xb0 fs/block_dev.c:1670
 [<ffffffff81575c83>] __fput+0x263/0x700 fs/file_table.c:208
 [<ffffffff815761a5>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff81195dec>] task_work_run+0x10c/0x180 kernel/task_work.c:116
 [<ffffffff81168608>] get_signal+0x1138/0x1450 kernel/signal.c:2147
 [<ffffffff810524d7>] do_signal+0x87/0x19f0 arch/x86/kernel/signal.c:807
 [<ffffffff81005581>] exit_to_usermode_loop+0xe1/0x120 arch/x86/entry/common.c:157
 [<ffffffff81007073>] prepare_exit_to_usermode arch/x86/entry/common.c:191 [inline]
 [<ffffffff81007073>] syscall_return_slowpath arch/x86/entry/common.c:260 [inline]
 [<ffffffff81007073>] do_syscall_32_irqs_on arch/x86/entry/common.c:331 [inline]
 [<ffffffff81007073>] do_fast_syscall_32+0x5c3/0x870 arch/x86/entry/common.c:387
 [<ffffffff838d6fd0>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137

Showing all locks held in the system:
3 locks held by kworker/u4:2/35:
 #0:  ("writeback"){.+.+.+}, at: [<ffffffff8118ab5e>] work_static include/linux/workqueue.h:186 [inline]
 #0:  ("writeback"){.+.+.+}, at: [<ffffffff8118ab5e>] set_work_data kernel/workqueue.c:617 [inline]
 #0:  ("writeback"){.+.+.+}, at: [<ffffffff8118ab5e>] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0:  ("writeback"){.+.+.+}, at: [<ffffffff8118ab5e>] process_one_work+0x6ee/0x1500 kernel/workqueue.c:2085
 #1:  ((&(&wb->dwork)->work)){+.+.+.}, at: [<ffffffff8118ab98>] process_one_work+0x728/0x1500 kernel/workqueue.c:2089
 #2:  (&type->s_umount_key#29){.+.+..}, at: [<ffffffff8157a140>] trylock_super+0x20/0xf0 fs/super.c:393
2 locks held by khungtaskd/516:
 #0:  (rcu_read_lock){......}, at: [<ffffffff813643ec>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff813643ec>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81423dc0>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3608:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d582c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3705:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff838d3a72>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff820080d2>] n_tty_read+0x202/0x16b0 drivers/tty/n_tty.c:2133
1 lock held by syz-executor3/5444:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8162e23b>] __blkdev_put+0xbb/0x840 fs/block_dev.c:1579
1 lock held by syz-executor3/5504:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff816330e8>] iterate_bdevs+0xc8/0x260 fs/block_dev.c:1976
1 lock held by syz-executor3/5505:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff816330e8>] iterate_bdevs+0xc8/0x260 fs/block_dev.c:1976
1 lock held by blkid/5513:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8162eacc>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268

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

NMI backtrace for cpu 1
CPU: 1 PID: 516 Comm: khungtaskd Not tainted 4.9.92-g4fb542f #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8affd08 ffffffff81d9c509 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b7d90 ffff8801d8affd40
 ffffffff81da7847 0000000000000001 0000000000000000 0000000000000002
Call Trace:
 [<ffffffff81d9c509>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d9c509>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81da7847>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81da77da>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b7e94>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81364984>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81364984>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81364984>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81364984>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119ab0d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff838d5a9c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.92-g4fb542f #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffffffff84429880 task.stack: ffffffff84400000
RIP: 0010:[<ffffffff811fba00>] 
c [<ffffffff811fba00>] update_sd_lb_stats+0xa0/0x3a20 kernel/sched/fair.c:8856
RSP: 0018:ffff8801db207900  EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffff8801d9acd400 RCX: 0000000000000000
RDX: ffffed003b640f3a RSI: ffff8801db207b08 RDI: 1ffff1003b640f9d
RBP: ffff8801db207a98 R08: ffff8801db207e48 R09: dffffc0000000000
R10: fffffbfff0881200 R11: 0000000000000001 R12: ffff8801db207be8
R13: 1ffff1003b640f5d R14: ffff8801db207b08 R15: ffff8801d9a1cf00
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9ccbad9400 CR3: 00000001bfd44000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff81279c13
c ffff8801db221c20
c ffff8801db2079c0
c ffffffff84429880
c
 1ffff1003b640f39
c 1ffff1003b640f3a
c 00000000844dede0
c ffff8801db207b18
c
 ffff8801db207b10
c ffff8801db207d20
c fffffbfff0881200
c ffff8801db207cf4
c
Call Trace:
 [<ffffffff811ff410>] find_busiest_group+0x90/0x12e0 kernel/sched/fair.c:9186
 [<ffffffff81200a00>] load_balance+0x3a0/0x2fa0 kernel/sched/fair.c:9472
 [<ffffffff81205aee>] rebalance_domains+0x6be/0xbc0 kernel/sched/fair.c:10113
 [<ffffffff812062e9>] run_rebalance_domains+0x2f9/0x510 kernel/sched/fair.c:10331
 [<ffffffff838dc4bb>] __do_softirq+0x20b/0x937 kernel/softirq.c:284
 [<ffffffff81148dc7>] invoke_softirq kernel/softirq.c:364 [inline]
 [<ffffffff81148dc7>] irq_exit+0x147/0x190 kernel/softirq.c:405
 [<ffffffff838da061>] smp_reschedule_interrupt+0x71/0x90 arch/x86/kernel/smp.c:270
 [<ffffffff838d7bd0>] reschedule_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:671
 <EOI> 
d [<ffffffff838d44d6>] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53
 [<ffffffff838d3b15>] arch_safe_halt arch/x86/include/asm/paravirt.h:104 [inline]
 [<ffffffff838d3b15>] default_idle+0x55/0x360 arch/x86/kernel/process.c:295
 [<ffffffff81069fa0>] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:286
 [<ffffffff838d4935>] default_idle_call+0x45/0x60 kernel/sched/idle.c:97
 [<ffffffff81220725>] cpuidle_idle_call kernel/sched/idle.c:155 [inline]
 [<ffffffff81220725>] cpu_idle_loop kernel/sched/idle.c:248 [inline]
 [<ffffffff81220725>] cpu_startup_entry+0x2b5/0x380 kernel/sched/idle.c:303
 [<ffffffff838c179c>] rest_init+0x183/0x189 init/main.c:408
 [<ffffffff84a73943>] start_kernel+0x67e/0x6b2 init/main.c:663
 [<ffffffff84a7229a>] x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:196
 [<ffffffff84a723db>] x86_64_start_kernel+0x13f/0x162 arch/x86/kernel/head64.c:177
Code: 
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c