Buffer I/O error on dev loop0, logical block 3, lost async page write
INFO: task syz-executor1:8798 blocked for more than 120 seconds.
      Not tainted 4.9.79-g47af77b #26
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1   D27200  8798   8665 0x00000004
 ffff8801cddd8000 ffff8801b4255f80 ffff8801cb748540 ffff8801b309c800
 ffff8801db321b98 ffff8801d904f2c0 ffffffff838a23db 0000000041b58ab3
 ffffffff84193118 00ffffff8123be70 ffff8801db322468 ffff8801db322490
Call Trace:
 [<ffffffff838a397f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3550
 [<ffffffff838afadc>] schedule_timeout+0x56c/0x10b0 kernel/time/timer.c:1768
 [<ffffffff838a1b8e>] io_schedule_timeout+0x1be/0x390 kernel/sched/core.c:5172
 [<ffffffff838a4df9>] io_schedule include/linux/sched.h:460 [inline]
 [<ffffffff838a4df9>] bit_wait_io+0x19/0xa0 kernel/sched/wait.c:582
 [<ffffffff838a44d7>] __wait_on_bit+0x57/0x120 kernel/sched/wait.c:383
 [<ffffffff814325c4>] wait_on_page_bit+0xf4/0x140 mm/filemap.c:802
 [<ffffffff814327d1>] wait_on_page_writeback include/linux/pagemap.h:526 [inline]
 [<ffffffff814327d1>] __filemap_fdatawait_range+0x1c1/0x2b0 mm/filemap.c:453
 [<ffffffff814328e5>] filemap_fdatawait_range+0x25/0x50 mm/filemap.c:483
 [<ffffffff8143b624>] filemap_write_and_wait_range+0x74/0xb0 mm/filemap.c:584
 [<ffffffff8162a706>] blkdev_fsync+0x66/0xb0 fs/block_dev.c:369
 [<ffffffff8161608a>] vfs_fsync_range+0x10a/0x250 fs/sync.c:195
 [<ffffffff8162d2d6>] generic_write_sync include/linux/fs.h:2588 [inline]
 [<ffffffff8162d2d6>] blkdev_write_iter+0x2a6/0x380 fs/block_dev.c:1720
 [<ffffffff8156de60>] vfs_iter_write+0x2e0/0x450 fs/read_write.c:393
 [<ffffffff81613005>] iter_file_splice_write+0x5b5/0xb60 fs/splice.c:768
 [<ffffffff8160de45>] do_splice_from fs/splice.c:870 [inline]
 [<ffffffff8160de45>] direct_splice_actor+0x125/0x180 fs/splice.c:1037
 [<ffffffff8160f40c>] splice_direct_to_actor+0x2cc/0x800 fs/splice.c:992
 [<ffffffff8160fae7>] do_splice_direct+0x1a7/0x270 fs/splice.c:1080
 [<ffffffff81572afb>] do_sendfile+0x54b/0xd30 fs/read_write.c:1401
 [<ffffffff81574a51>] SYSC_sendfile64 fs/read_write.c:1456 [inline]
 [<ffffffff81574a51>] SyS_sendfile64+0xd1/0x160 fs/read_write.c:1448
 [<ffffffff838b346e>] entry_SYSCALL_64_fastpath+0x29/0xe8

Showing all locks held in the system:
3 locks held by kworker/u4:1/22:
 #0:  ("writeback"){++++.+}, at: [<ffffffff81189722>] work_static include/linux/workqueue.h:186 [inline]
 #0:  ("writeback"){++++.+}, at: [<ffffffff81189722>] set_work_data kernel/workqueue.c:617 [inline]
 #0:  ("writeback"){++++.+}, at: [<ffffffff81189722>] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0:  ("writeback"){++++.+}, at: [<ffffffff81189722>] process_one_work+0x6f2/0x1610 kernel/workqueue.c:2085
 #1:  ((&(&wb->dwork)->work)){+.+.+.}, at: [<ffffffff8118975c>] process_one_work+0x72c/0x1610 kernel/workqueue.c:2089
 #2:  (&type->s_umount_key#22){.+.+..}, at: [<ffffffff81579b80>] trylock_super+0x20/0x100 fs/super.c:393
2 locks held by khungtaskd/514:
 #0:  (rcu_read_lock){......}, at: [<ffffffff81372ec5>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81372ec5>] watchdog+0x125/0xa70 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81237fd0>] debug_show_all_locks+0x70/0x280 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3908:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d3a4f>] __fdget_pos+0x9f/0xc0 fs/file.c:781
2 locks held by getty/4036:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff838b1652>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff82009ed4>] n_tty_read+0x1f4/0x16c0 drivers/tty/n_tty.c:2133

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

NMI backtrace for cpu 0
CPU: 0 PID: 514 Comm: khungtaskd Not tainted 4.9.79-g47af77b #26
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d803fd00 ffffffff81d94b09 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810bac60 ffff8801d803fd38
 ffffffff81d9fc2d 0000000000000000 0000000000000000 ffff8801d8b78418
Call Trace:
 [<ffffffff81d94b09>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d94b09>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81d9fc2d>] nmi_cpu_backtrace+0xfd/0x120 lib/nmi_backtrace.c:99
 [<ffffffff81d9fd67>] nmi_trigger_cpumask_backtrace+0x117/0x190 lib/nmi_backtrace.c:60
 [<ffffffff810bad54>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81373490>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81373490>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81373490>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81373490>] watchdog+0x6f0/0xa70 kernel/hung_task.c:239
 [<ffffffff8119a72d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff838b37dc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:477
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.79-g47af77b #26
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9b73000 task.stack: ffff8801d9b88000
RIP: 0010:[<ffffffff838b5860>] 
c [<ffffffff838b5860>] reschedule_interrupt+0x0/0xb0 arch/x86/entry/entry_64.S:774
RSP: 0018:ffff8801d9b8fd68  EFLAGS: 00000046
RAX: 0000000000000007 RBX: ffffffff84a279a8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8801d9b738ac
RBP: ffff8801d9b8fd98 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffffffff84a36ab8 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f77933f1000 CR3: 00000001b4064000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff838b20c6
c 0000000000000010
c 0000000000000246
c ffff8801d9b8fd98
c
 0000000000000018
c ffffffff8123b84d
c ffff8801d9b8fdd0
c ffffffff838b16f5
c
 ffff8801d9b73000
c 0000000000000001
c ffffffff84a36ab8
c 0000000000000000
c
Call Trace:
 [<ffffffff838b16f5>] arch_safe_halt arch/x86/include/asm/paravirt.h:103 [inline]
 [<ffffffff838b16f5>] default_idle+0x55/0x360 arch/x86/kernel/process.c:295
 [<ffffffff8106bc9a>] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:286
 [<ffffffff838b2506>] default_idle_call+0x36/0x60 kernel/sched/idle.c:97
 [<ffffffff812265d0>] cpuidle_idle_call kernel/sched/idle.c:155 [inline]
 [<ffffffff812265d0>] cpu_idle_loop kernel/sched/idle.c:248 [inline]
 [<ffffffff812265d0>] cpu_startup_entry+0x2b0/0x380 kernel/sched/idle.c:303
 [<ffffffff810afd13>] start_secondary+0x303/0x3e0 arch/x86/kernel/smpboot.c:254
Code: 
c04 
c25 
cd4 
c7c 
c01 
c00 
c65 
c48 
c0f 
c44 
c24 
c25 
cd8 
c7c 
c01 
c00 
c57 
ce8 
cd1 
cd7 
c74 
cfd 
ce8 
c20 
c2a 
c00 
c00 
ce9 
ccb 
ce6 
cff 
cff 
c90 
c66 
c2e 
c0f 
c1f 
c84 
c00 
c00 
c00 
c00 
c00 
c<0f> 
c1f 
c00 
c68 
c02 
cff 
cff 
cff 
cfc 
c48 
c83 
cc4 
c88 
c4c 
c89 
c5c 
c24 
c30 
c4c 
c89 
c54 
c