Buffer I/O error on dev loop0, logical block 8, lost async page write
Buffer I/O error on dev loop0, logical block 9, lost async page write
Buffer I/O error on dev loop0, logical block 10, lost async page write
device lo left promiscuous mode
device lo entered promiscuous mode
INFO: task syz-executor4:19315 blocked for more than 120 seconds.
      Not tainted 4.9.89-gebc2789 #3
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor4   D26544 19315  17016 0x20020004
 ffff8801d8fd4800 ffff8801b5e40fc0 ffff8801b5e40000 ffff8801d06a3000
 ffff8801db321b98 ffff8801b1da7190 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
 [<ffffffff8143be4a>] generic_file_direct_write+0x14a/0x500 mm/filemap.c:2618
 [<ffffffff8143c41f>] __generic_file_write_iter+0x21f/0x570 mm/filemap.c:2823
 [<ffffffff8162dcac>] blkdev_write_iter+0x1bc/0x380 fs/block_dev.c:1718
 [<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:
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/3656:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d449f>] __fdget_pos+0x9f/0xc0 fs/file.c:781
2 locks held by getty/3785:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff838b5ce2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff8200b624>] n_tty_read+0x1f4/0x16c0 drivers/tty/n_tty.c:2133
3 locks held by kworker/u4:11/7565:
 #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
1 lock held by blkid/18692:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8162e61c>] __blkdev_put+0xbc/0x7e0 fs/block_dev.c:1579

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

NMI backtrace for cpu 1
CPU: 1 PID: 515 Comm: khungtaskd Not tainted 4.9.89-gebc2789 #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8517d00 ffffffff81d96069 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810bb690 ffff8801d8517d38
 ffffffff81da118d 0000000000000001 0000000000000000 ffff8801d35b9c18
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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 7 Comm: rcu_preempt Not tainted 4.9.89-gebc2789 #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9b41800 task.stack: ffff8801d9b50000
RIP: 0010:[<ffffffff8153d684>] 
c [<ffffffff8153d684>] memory_is_poisoned_n mm/kasan/kasan.c:269 [inline]
RIP: 0010:[<ffffffff8153d684>] 
c [<ffffffff8153d684>] memory_is_poisoned mm/kasan/kasan.c:299 [inline]
RIP: 0010:[<ffffffff8153d684>] 
c [<ffffffff8153d684>] check_memory_region_inline mm/kasan/kasan.c:315 [inline]
RIP: 0010:[<ffffffff8153d684>] 
c [<ffffffff8153d684>] check_memory_region+0x94/0x190 mm/kasan/kasan.c:325
RSP: 0018:ffff8801d9b57a48  EFLAGS: 00000246
RAX: ffffed003b36af73 RBX: ffff8801d9b57b97 RCX: ffffffff812a536a
RDX: 0000000000000001 RSI: 0000000000000010 RDI: ffff8801d9b57b88
RBP: ffff8801d9b57a58 R08: ffffed003b36af73 R09: ffffed003b36af73
R10: 0000000000000002 R11: ffffed003b36af72 R12: ffffed003b36af73
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c420bd4010 CR3: 00000001b5428000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d9b57b88
c 0000000000000010
c ffff8801d9b57a80
c ffffffff8153dcd3
c
 ffff8801d9b57b50
c ffffffff83a70da0
c ffffffff85903dc0
c ffff8801d9b57ab0
c
 ffffffff812a536a
c 0000000100001a49
c 1ffff1003b36af5e
c ffff8801d9b57b50
c
Call Trace:
 [<ffffffff8153dcd3>] memset+0x23/0x40 mm/kasan/kasan.c:343
 [<ffffffff812a536a>] do_init_timer+0xda/0x120 kernel/time/timer.c:796
 [<ffffffff838b3cf8>] init_timer_on_stack_key kernel/time/timer.c:747 [inline]
 [<ffffffff838b3cf8>] schedule_timeout+0xf8/0x10b0 kernel/time/timer.c:1789
 [<ffffffff81295858>] rcu_gp_kthread+0xe68/0x2200 kernel/rcu/tree.c:2227
 [<ffffffff8119af4d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff838b7c9c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Code: 
c01 
c00 
c00 
c00 
c00 
cfc 
cff 
cdf 
c4d 
c01 
cd1 
c49 
c01 
cc0 
c4d 
c39 
cc1 
c4c 
c89 
cc0 
c74 
c15 
c49 
c83 
cc0 
c01 
c80 
c38 
c00 
c74 
cef 
c48 
c85 
cc0 
c49 
c89 
cc0 
c0f 
c85 
c89 
c00 
c00 
c00 
c<5b> 
c41 
c5c 
c5d 
cc3 
c45 
c89 
cc8 
c41 
c83 
ce0 
c07 
c74 
c28 
cb8 
c08 
c00 
c00 
c00 
c44 
c29 
c