netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'.
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
INFO: task syz-executor7:13631 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-executor7   D26720 13631   3861 0x20020004
 ffff8801d74e1800 0000000000000000 ffff8801b31f0540 ffffffff84429880
 ffff8801db221b98 ffff8801ab817250 ffffffff838a6c0b 0000000041b58ab3
 ffffffff84194320 00ffffff8123c550 ffff8801db222468 ffff8801db222490
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
2 locks held by getty/3784:
 #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

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

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
 ffff8801d863fd00 ffffffff81d96069 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810bb690 ffff8801d863fd38
 ffffffff81da118d 0000000000000001 0000000000000000 ffff8801c6246418
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: 0 Comm: swapper/0 Not tainted 4.9.89-gebc2789 #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffffffff84429880 task.stack: ffffffff84400000
RIP: 0010:[<ffffffff838b9d70>] 
c [<ffffffff838b9d70>] reschedule_interrupt+0x0/0xb0 arch/x86/entry/entry_64.S:670
RSP: 0018:ffffffff84407d98  EFLAGS: 00000046
RAX: 0000000000000007 RBX: ffffffff84a281e8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff8442a12c
RBP: ffffffff84407dc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff84a372f8 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000017240d0 CR3: 00000001cbbfe000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff838b6756
c 0000000000000010
c 0000000000000246
c ffffffff84407dc0
c
 0000000000000018
c ffffffff84407df8
c ffffffff838b5d85
c ffffffff84429880
c
 0000000000000000
c ffffffff84a372f8
c 0000000000000000
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
 [<ffffffff838a3854>] rest_init+0x184/0x190 init/main.c:408
 [<ffffffff84a708b2>] start_kernel+0x684/0x6b9 init/main.c:663
 [<ffffffff84a6f29d>] x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:196
 [<ffffffff84a6f3df>] x86_64_start_kernel+0x140/0x163 arch/x86/kernel/head64.c:177
Code: 
c04 
c25 
cd4 
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c01 
c00 
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c48 
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c44 
c24 
c25 
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c7c 
c01 
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cc1 
c92 
c74 
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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