Buffer I/O error on dev loop0, logical block 3, async page read
Buffer I/O error on dev loop0, logical block 1, lost async page write
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
Buffer I/O error on dev loop0, logical block 7, async page read
INFO: task syz-executor2:7022 blocked for more than 120 seconds.
      Not tainted 4.9.89-gf361eb3 #2
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor2   D26992  7022   3861 0x20020004
 ffff8801c1ebb000 ffff8801d3e60fc0 ffff8801d6877480 ffff8801d45ab000
 ffff8801db321b98 ffff8801cf38f250 ffffffff838a6c0b 0000000041b58ab3
 ffffffff84194320 00ffffff8123c550 ffff8801db322468 ffff8801db322490
Call Trace:
 [<ffffffff838a81af>] schedule+0x7f/0x1b0 kernel/sched/core.c:3551
 [<ffffffff838b416c>] schedule_timeout+0x56c/0x10b0 kernel/time/timer.c:1768
 [<ffffffff838a63be>] io_schedule_timeout+0x1be/0x390 kernel/sched/core.c:5173
 [<ffffffff838a9629>] io_schedule include/linux/sched.h:460 [inline]
 [<ffffffff838a9629>] bit_wait_io+0x19/0xa0 kernel/sched/wait.c:582
 [<ffffffff838a8d07>] __wait_on_bit+0x57/0x120 kernel/sched/wait.c:383
 [<ffffffff81432c64>] wait_on_page_bit+0xf4/0x140 mm/filemap.c:802
 [<ffffffff81432e71>] wait_on_page_writeback include/linux/pagemap.h:526 [inline]
 [<ffffffff81432e71>] __filemap_fdatawait_range+0x1c1/0x2b0 mm/filemap.c:453
 [<ffffffff81432f85>] filemap_fdatawait_range+0x25/0x50 mm/filemap.c:483
 [<ffffffff8143bcc4>] filemap_write_and_wait_range+0x74/0xb0 mm/filemap.c:584
 [<ffffffff8162b1c6>] blkdev_fsync+0x66/0xb0 fs/block_dev.c:369
 [<ffffffff81616b1a>] vfs_fsync_range+0x10a/0x250 fs/sync.c:195
 [<ffffffff8162dd96>] generic_write_sync include/linux/fs.h:2590 [inline]
 [<ffffffff8162dd96>] blkdev_write_iter+0x2a6/0x380 fs/block_dev.c:1720
 [<ffffffff8156e830>] vfs_iter_write+0x2e0/0x450 fs/read_write.c:390
 [<ffffffff81613a95>] iter_file_splice_write+0x5b5/0xb60 fs/splice.c:768
 [<ffffffff8160e8d5>] do_splice_from fs/splice.c:870 [inline]
 [<ffffffff8160e8d5>] direct_splice_actor+0x125/0x180 fs/splice.c:1037
 [<ffffffff8160fe9c>] splice_direct_to_actor+0x2cc/0x800 fs/splice.c:992
 [<ffffffff81610577>] do_splice_direct+0x1a7/0x270 fs/splice.c:1080
 [<ffffffff8157354b>] do_sendfile+0x54b/0xd30 fs/read_write.c:1393
 [<ffffffff81575601>] C_SYSC_sendfile fs/read_write.c:1469 [inline]
 [<ffffffff81575601>] 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
 [<ffffffff838b9210>] 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/u4:1/22:
 #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: [<ffffffff8157a5e0>] trylock_super+0x20/0x100 fs/super.c:393
2 locks held by khungtaskd/515:
 #0:  (rcu_read_lock){......}, at: [<ffffffff81373705>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81373705>] watchdog+0x125/0xa70 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff812386b0>] debug_show_all_locks+0x70/0x280 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3654:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d449f>] __fdget_pos+0x9f/0xc0 fs/file.c:781
2 locks held by getty/3782:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff838b5ce2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8200b5a4>] n_tty_read+0x1f4/0x16c0 drivers/tty/n_tty.c:2133

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

NMI backtrace for cpu 0
CPU: 0 PID: 515 Comm: khungtaskd Not tainted 4.9.89-gf361eb3 #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d9747d00 ffffffff81d96069 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810bb690 ffff8801d9747d38
 ffffffff81da118d 0000000000000000 0000000000000000 ffff8801c1eb6418
Call Trace:
 [<ffffffff81d96069>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d96069>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81da118d>] nmi_cpu_backtrace+0xfd/0x120 lib/nmi_backtrace.c:99
 [<ffffffff81da12c7>] 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
 [<ffffffff81373cd0>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81373cd0>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81373cd0>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81373cd0>] watchdog+0x6f0/0xa70 kernel/hung_task.c:239
 [<ffffffff8119af4d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff838b7c9c>] 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-gf361eb3 #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9b73000 task.stack: ffff8801d9b88000
RIP: 0010:[<ffffffff838b9d70>] 
c [<ffffffff838b9d70>] reschedule_interrupt+0x0/0xb0 arch/x86/entry/entry_64.S:670
RSP: 0018:ffff8801d9b8fd68  EFLAGS: 00000046
RAX: 0000000000000007 RBX: ffffffff84a281e8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8801d9b738ac
RBP: ffff8801d9b8fd98 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffffffff84a372f8 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9de2550000 CR3: 00000001b69e2000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff838b6756
c 0000000000000010
c 0000000000000246
c ffff8801d9b8fd98
c
 0000000000000018
c ffffffff8123bf2d
c ffff8801d9b8fdd0
c ffffffff838b5d85
c
 ffff8801d9b73000
c 0000000000000001
c ffffffff84a372f8
c 0000000000000000
c
Call Trace:
 [<ffffffff838b5d85>] arch_safe_halt arch/x86/include/asm/paravirt.h:104 [inline]
 [<ffffffff838b5d85>] default_idle+0x55/0x360 arch/x86/kernel/process.c:295
 [<ffffffff8106be0a>] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:286
 [<ffffffff838b6b96>] default_idle_call+0x36/0x60 kernel/sched/idle.c:97
 [<ffffffff81226cb0>] cpuidle_idle_call kernel/sched/idle.c:155 [inline]
 [<ffffffff81226cb0>] cpu_idle_loop kernel/sched/idle.c:248 [inline]
 [<ffffffff81226cb0>] cpu_startup_entry+0x2b0/0x380 kernel/sched/idle.c:303
 [<ffffffff810b0693>] 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 
cc1 
c92 
c74 
cfd 
ce8 
c20 
c2a 
c00 
c00 
ce9 
c7b 
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