INFO: task syz-executor4:8985 blocked for more than 120 seconds.
      Not tainted 4.9.88-g71df7bb #8
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor4   D27232  8985   3865 0x20020004
 ffff8801b0141800 ffff8801bd31e4c0 ffff8801bd170a80 ffff8801b0220000
 ffff8801db321b98 ffff8801d91ef2b0 ffffffff838a69cb 0000000041b58ab3
 ffffffff84194260 00ffffff8123c410 ffff8801db322468 ffff8801db322490
Call Trace:
 [<ffffffff838a7f6f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3550
 [<ffffffff838b40cc>] schedule_timeout+0x56c/0x10b0 kernel/time/timer.c:1768
 [<ffffffff838a617e>] io_schedule_timeout+0x1be/0x390 kernel/sched/core.c:5172
 [<ffffffff816395ee>] io_schedule include/linux/sched.h:460 [inline]
 [<ffffffff816395ee>] dio_await_one fs/direct-io.c:461 [inline]
 [<ffffffff816395ee>] dio_await_completion fs/direct-io.c:515 [inline]
 [<ffffffff816395ee>] do_blockdev_direct_IO+0x481e/0x7ab0 fs/direct-io.c:1331
 [<ffffffff8163c925>] __blockdev_direct_IO+0xa5/0xd0 fs/direct-io.c:1360
 [<ffffffff8162ba60>] blkdev_direct_IO+0xa0/0xd0 fs/block_dev.c:183
 [<ffffffff8143d573>] generic_file_read_iter+0x793/0x1ac0 mm/filemap.c:1952
 [<ffffffff8162ca55>] blkdev_read_iter+0x105/0x170 fs/block_dev.c:1738
 [<ffffffff816112f4>] generic_file_splice_read+0x294/0x510 fs/splice.c:309
 [<ffffffff8160faaa>] do_splice_to+0x10a/0x160 fs/splice.c:899
 [<ffffffff8160fd4d>] splice_direct_to_actor+0x24d/0x800 fs/splice.c:971
 [<ffffffff816104a7>] do_splice_direct+0x1a7/0x270 fs/splice.c:1080
 [<ffffffff815733eb>] do_sendfile+0x54b/0xd30 fs/read_write.c:1393
 [<ffffffff815754a1>] C_SYSC_sendfile fs/read_write.c:1469 [inline]
 [<ffffffff815754a1>] 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
 [<ffffffff838b9190>] 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/514:
 #0:  (rcu_read_lock){......}, at: [<ffffffff813735a5>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff813735a5>] watchdog+0x125/0xa70 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81238570>] debug_show_all_locks+0x70/0x280 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3646:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d43cf>] __fdget_pos+0x9f/0xc0 fs/file.c:781
2 locks held by getty/3774:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff838b5c42>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff8200b3a4>] n_tty_read+0x1f4/0x16c0 drivers/tty/n_tty.c:2133

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

NMI backtrace for cpu 1
CPU: 1 PID: 514 Comm: khungtaskd Not tainted 4.9.88-g71df7bb #8
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d867fd00 ffffffff81d95f19 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810bb450 ffff8801d867fd38
 ffffffff81da103d 0000000000000001 0000000000000000 ffff8801b015b418
Call Trace:
 [<ffffffff81d95f19>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d95f19>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81da103d>] nmi_cpu_backtrace+0xfd/0x120 lib/nmi_backtrace.c:99
 [<ffffffff81da1177>] nmi_trigger_cpumask_backtrace+0x117/0x190 lib/nmi_backtrace.c:60
 [<ffffffff810bb544>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81373b70>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81373b70>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81373b70>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81373b70>] watchdog+0x6f0/0xa70 kernel/hung_task.c:239
 [<ffffffff8119ae6d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff838b7c1c>] 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 4.9.88-g71df7bb #8
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffffffff84429880 task.stack: ffffffff84400000
RIP: 0010:[<ffffffff81233e0a>] 
c [<ffffffff81233e0a>] trace_hardirqs_off_caller+0x7a/0x280 kernel/locking/lockdep.c:2756
RSP: 0018:ffff8801db207f78  EFLAGS: 00000803
RAX: dffffc0000000000 RBX: ffffffff84429880 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff8442a12c
RBP: ffff8801db207f90 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff84429880
R13: ffffffff838b9d8b R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f381dd119b8 CR3: 00000001b6876000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff84a28128
c 0000000000000000
c ffffffff84a37238
c ffff8801db207fe8
c
 ffffffff81003036
c 0000000000000000
c 0000000000000000
c 0000000000000000
c
 0000000000000000
c 0000000000000007
c 0000000000000000
c 0000000000000000
c
Call Trace:
 <IRQ> 
d [<ffffffff81003036>] trace_hardirqs_off_thunk+0x1a/0x1c
 [<ffffffff838b9d8b>] reschedule_interrupt+0x9b/0xb0 arch/x86/entry/entry_64.S:671
 <EOI> 
d [<ffffffff838b66b6>] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53
 [<ffffffff838b5ce5>] arch_safe_halt arch/x86/include/asm/paravirt.h:104 [inline]
 [<ffffffff838b5ce5>] default_idle+0x55/0x360 arch/x86/kernel/process.c:295
 [<ffffffff8106bc3a>] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:286
 [<ffffffff838b6af6>] default_idle_call+0x36/0x60 kernel/sched/idle.c:97
 [<ffffffff81226b70>] cpuidle_idle_call kernel/sched/idle.c:155 [inline]
 [<ffffffff81226b70>] cpu_idle_loop kernel/sched/idle.c:248 [inline]
 [<ffffffff81226b70>] cpu_startup_entry+0x2b0/0x380 kernel/sched/idle.c:303
 [<ffffffff838a3614>] 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: 
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c02 
c<48> 
c89 
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cd0 
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cd2 
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c00 
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c