Buffer I/O error on dev loop0, logical block 3, async page read
Buffer I/O error on dev loop0, logical block 2, lost async page write
Buffer I/O error on dev loop0, logical block 3, lost async page write
INFO: task syz-executor1:10385 blocked for more than 120 seconds.
      Not tainted 4.9.89-ge34e318 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1   D26352 10385   3872 0x20020004
 ffff8801cb7b0000 0000000000000000 ffff8801cb8524c0 ffff8801d9b73000
 ffff8801db321b98 ffff8801cc9a7250 ffffffff838a4c0b 0000000041b58ab3
 ffffffff84193da8 00ffffff81239af0 ffff8801db322468 ffff8801db322490
Call Trace:
 [<ffffffff838a61af>] schedule+0x7f/0x1b0 kernel/sched/core.c:3551
 [<ffffffff838b216c>] schedule_timeout+0x56c/0x10b0 kernel/time/timer.c:1768
 [<ffffffff838a43be>] io_schedule_timeout+0x1be/0x390 kernel/sched/core.c:5173
 [<ffffffff838a7629>] io_schedule include/linux/sched.h:460 [inline]
 [<ffffffff838a7629>] bit_wait_io+0x19/0xa0 kernel/sched/wait.c:582
 [<ffffffff838a6d07>] __wait_on_bit+0x57/0x120 kernel/sched/wait.c:383
 [<ffffffff81430204>] wait_on_page_bit+0xf4/0x140 mm/filemap.c:802
 [<ffffffff81430411>] wait_on_page_writeback include/linux/pagemap.h:526 [inline]
 [<ffffffff81430411>] __filemap_fdatawait_range+0x1c1/0x2b0 mm/filemap.c:453
 [<ffffffff81430525>] filemap_fdatawait_range+0x25/0x50 mm/filemap.c:483
 [<ffffffff81439264>] filemap_write_and_wait_range+0x74/0xb0 mm/filemap.c:584
 [<ffffffff81628766>] blkdev_fsync+0x66/0xb0 fs/block_dev.c:369
 [<ffffffff816140ba>] vfs_fsync_range+0x10a/0x250 fs/sync.c:195
 [<ffffffff8162b336>] generic_write_sync include/linux/fs.h:2590 [inline]
 [<ffffffff8162b336>] blkdev_write_iter+0x2a6/0x380 fs/block_dev.c:1720
 [<ffffffff8156bdd0>] vfs_iter_write+0x2e0/0x450 fs/read_write.c:390
 [<ffffffff81611035>] iter_file_splice_write+0x5b5/0xb60 fs/splice.c:768
 [<ffffffff8160be75>] do_splice_from fs/splice.c:870 [inline]
 [<ffffffff8160be75>] direct_splice_actor+0x125/0x180 fs/splice.c:1037
 [<ffffffff8160d43c>] splice_direct_to_actor+0x2cc/0x800 fs/splice.c:992
 [<ffffffff8160db17>] do_splice_direct+0x1a7/0x270 fs/splice.c:1080
 [<ffffffff81570aeb>] do_sendfile+0x54b/0xd30 fs/read_write.c:1393
 [<ffffffff81572ba1>] C_SYSC_sendfile fs/read_write.c:1469 [inline]
 [<ffffffff81572ba1>] compat_SyS_sendfile+0xd1/0x160 fs/read_write.c:1458
 [<ffffffff81006f95>] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
 [<ffffffff81006f95>] do_fast_syscall_32+0x2f5/0x870 arch/x86/entry/common.c:387
 [<ffffffff838b7210>] 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/u4:2/36:
 #0:  ("writeback"){.+.+.+}, at: [<ffffffff81189f42>] work_static include/linux/workqueue.h:186 [inline]
 #0:  ("writeback"){.+.+.+}, at: [<ffffffff81189f42>] set_work_data kernel/workqueue.c:617 [inline]
 #0:  ("writeback"){.+.+.+}, at: [<ffffffff81189f42>] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0:  ("writeback"){.+.+.+}, at: [<ffffffff81189f42>] process_one_work+0x6f2/0x1610 kernel/workqueue.c:2085
 #1:  ((&(&wb->dwork)->work)){+.+.+.}, at: [<ffffffff81189f7c>] process_one_work+0x72c/0x1610 kernel/workqueue.c:2089
 #2:  (&type->s_umount_key#22){.+.+..}, at: [<ffffffff81577b80>] trylock_super+0x20/0x100 fs/super.c:393
2 locks held by khungtaskd/516:
 #0:  (rcu_read_lock){......}, at: [<ffffffff81370ca5>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81370ca5>] watchdog+0x125/0xa70 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81235c50>] debug_show_all_locks+0x70/0x280 kernel/locking/lockdep.c:4336
2 locks held by getty/3777:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff838b3ce2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff82008bc4>] n_tty_read+0x1f4/0x16c0 drivers/tty/n_tty.c:2133

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

NMI backtrace for cpu 0
CPU: 0 PID: 516 Comm: khungtaskd Not tainted 4.9.89-ge34e318 #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d86b7d00 ffffffff81d93609 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810bb690 ffff8801d86b7d38
 ffffffff81d9e72d 0000000000000000 0000000000000000 ffff8801cb35e418
Call Trace:
 [<ffffffff81d93609>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d93609>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81d9e72d>] nmi_cpu_backtrace+0xfd/0x120 lib/nmi_backtrace.c:99
 [<ffffffff81d9e867>] nmi_trigger_cpumask_backtrace+0x117/0x190 lib/nmi_backtrace.c:60
 [<ffffffff810bb784>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81371270>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81371270>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81371270>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81371270>] watchdog+0x6f0/0xa70 kernel/hung_task.c:239
 [<ffffffff8119af4d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff838b5c9c>] 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
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.89-ge34e318 #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9b73000 task.stack: ffff8801d9b88000
RIP: 0010:[<ffffffff811fca08>] 
c [<ffffffff811fca08>] source_load kernel/sched/fair.c:5245 [inline]
RIP: 0010:[<ffffffff811fca08>] 
c [<ffffffff811fca08>] update_sg_lb_stats kernel/sched/fair.c:8700 [inline]
RIP: 0010:[<ffffffff811fca08>] 
c [<ffffffff811fca08>] update_sd_lb_stats+0x7b8/0x3240 kernel/sched/fair.c:8881
RSP: 0018:ffff8801db307910  EFLAGS: 00000246
RAX: 1ffff1003b644395 RBX: ffff8801db3079e8 RCX: 0000000000000000
RDX: ffff8801db221b80 RSI: 0000000000000908 RDI: ffff8801db221ca8
RBP: ffff8801db307a90 R08: ffffffff842003e0 R09: 0000000000000000
R10: 0000000000000009 R11: 0000000000000000 R12: ffff8801db221b80
R13: 0000000000021b80 R14: dffffc0000000000 R15: ffff8801db307ce0
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fed46b159b8 CR3: 00000001b5dca000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffed003b36e715
c 1ffff1003b660f38
c 1ffff1003b660f39
c 0000000000000002
c
 fffffbfff0881200
c fffffbfff0881200
c ffff8801db307b18
c ffff8801db307b10
c
 ffff8801db307cf4
c ffff8801d9a1ceb0
c 0000000000000001
c ffff880100000001
c
Call Trace:
 [<ffffffff811ff520>] find_busiest_group+0x90/0x1300 kernel/sched/fair.c:9186
 [<ffffffff81200b2b>] load_balance+0x39b/0x2e90 kernel/sched/fair.c:9472
 [<ffffffff81205bf8>] rebalance_domains+0x5f8/0xb00 kernel/sched/fair.c:10113
 [<ffffffff812063f8>] run_rebalance_domains+0x2f8/0x540 kernel/sched/fair.c:10331
 [<ffffffff838bc5d6>] __do_softirq+0x206/0x951 kernel/softirq.c:284
 [<ffffffff81147315>] invoke_softirq kernel/softirq.c:364 [inline]
 [<ffffffff81147315>] irq_exit+0x165/0x190 kernel/softirq.c:405
 [<ffffffff838ba1fb>] smp_reschedule_interrupt+0x6b/0x80 arch/x86/kernel/smp.c:267
 [<ffffffff838b7e10>] reschedule_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:671
 <EOI> 
d [<ffffffff838b4756>] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53
 [<ffffffff838b3d85>] arch_safe_halt arch/x86/include/asm/paravirt.h:104 [inline]
 [<ffffffff838b3d85>] default_idle+0x55/0x360 arch/x86/kernel/process.c:295
 [<ffffffff8106be0a>] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:286
 [<ffffffff838b4b96>] default_idle_call+0x36/0x60 kernel/sched/idle.c:97
 [<ffffffff81224520>] cpuidle_idle_call kernel/sched/idle.c:155 [inline]
 [<ffffffff81224520>] cpu_idle_loop kernel/sched/idle.c:248 [inline]
 [<ffffffff81224520>] cpu_startup_entry+0x2b0/0x380 kernel/sched/idle.c:303
 [<ffffffff810b0693>] start_secondary+0x303/0x3e0 arch/x86/kernel/smpboot.c:254
Code: 
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c