INFO: task syz-executor5:23737 blocked for more than 120 seconds.
      Not tainted 4.9.105-gd7e64f8 #43
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor5   D27976 23737   3890 0x20020004
 ffff8801cce5b000 ffff8801aa28da40 ffff8801aa28d500 ffff8801b7c96000
 ffff8801db321c18 ffff88018157f310 ffffffff839e8c1d 1ffff100302afe56
 ffffffff85542240 0000000041b58ab3 00ffffff843c21d0 ffff8801db3224e8
Call Trace:
 [<ffffffff839ea21f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839f6631>] schedule_timeout+0x861/0xf70 kernel/time/timer.c:1768
 [<ffffffff839e83fa>] io_schedule_timeout+0x1ba/0x390 kernel/sched/core.c:5180
 [<ffffffff8164344b>] io_schedule include/linux/sched.h:460 [inline]
 [<ffffffff8164344b>] dio_await_one fs/direct-io.c:461 [inline]
 [<ffffffff8164344b>] dio_await_completion fs/direct-io.c:515 [inline]
 [<ffffffff8164344b>] do_blockdev_direct_IO+0x2d5b/0x5a80 fs/direct-io.c:1331
 [<ffffffff81646215>] __blockdev_direct_IO+0xa5/0xd0 fs/direct-io.c:1360
 [<ffffffff8162fdc0>] blkdev_direct_IO+0xa0/0xd0 fs/block_dev.c:183
 [<ffffffff8143ec00>] generic_file_read_iter+0x660/0x1a90 mm/filemap.c:1951
 [<ffffffff816329c5>] blkdev_read_iter+0x105/0x170 fs/block_dev.c:1738
 [<ffffffff816153c9>] generic_file_splice_read+0x2c9/0x4f0 fs/splice.c:309
 [<ffffffff81613b1c>] do_splice_to+0x10c/0x170 fs/splice.c:899
 [<ffffffff81613dbf>] splice_direct_to_actor+0x23f/0x7e0 fs/splice.c:971
 [<ffffffff81614503>] do_splice_direct+0x1a3/0x270 fs/splice.c:1080
 [<ffffffff815758f0>] do_sendfile+0x4f0/0xc60 fs/read_write.c:1393
 [<ffffffff81577ad1>] C_SYSC_sendfile fs/read_write.c:1469 [inline]
 [<ffffffff81577ad1>] compat_SyS_sendfile+0xd1/0x160 fs/read_write.c:1458
 [<ffffffff81006da7>] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
 [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870 arch/x86/entry/common.c:387
 [<ffffffff839fb210>] 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/518:
 #0:  (rcu_read_lock){......}, at: [<ffffffff81366b9c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81366b9c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81426180>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3673:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d83fc>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3770:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f7cc2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff82120062>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133

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

NMI backtrace for cpu 1
CPU: 1 PID: 518 Comm: khungtaskd Not tainted 4.9.105-gd7e64f8 #43
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d85ffd08 ffffffff81eb41a9 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b96a0 ffff8801d85ffd40
 ffffffff81ebf4a7 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb41a9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb41a9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebf4a7>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebf43a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b97a4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81367134>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81367134>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81367134>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81367134>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d04d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f9cdc>] 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 skipped: idling at pc 0xffffffff839f8726