SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=15958 comm=syz-executor0
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=31 sclass=netlink_route_socket pig=15997 comm=syz-executor2
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=15991 comm=syz-executor0
INFO: task syz-executor7:15993 blocked for more than 120 seconds.
      Not tainted 4.9.100-g39c8566 #28
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor7   D26984 15993   3878 0x00000004
 ffff8801d4acc800 ffff8801cd884fc0 ffff8801ccb90a80 ffff8801cd630000
 ffff8801db321b98 ffff8801969af320 ffffffff839e373d 1ffff10032d35e58
 ffffffff85541650 0000000041b58ab3 00ffffff843c1058 ffff8801db322468
Call Trace:
 [<ffffffff839e4d3f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839f1151>] schedule_timeout+0x861/0xf70 kernel/time/timer.c:1768
 [<ffffffff839e2f1a>] io_schedule_timeout+0x1ba/0x390 kernel/sched/core.c:5180
 [<ffffffff8164070b>] io_schedule include/linux/sched.h:460 [inline]
 [<ffffffff8164070b>] dio_await_one fs/direct-io.c:461 [inline]
 [<ffffffff8164070b>] dio_await_completion fs/direct-io.c:515 [inline]
 [<ffffffff8164070b>] do_blockdev_direct_IO+0x2d5b/0x5a80 fs/direct-io.c:1331
 [<ffffffff816434d5>] __blockdev_direct_IO+0xa5/0xd0 fs/direct-io.c:1360
 [<ffffffff8162d080>] blkdev_direct_IO+0xa0/0xd0 fs/block_dev.c:183
 [<ffffffff8143c680>] generic_file_read_iter+0x660/0x1a90 mm/filemap.c:1951
 [<ffffffff8162fc85>] blkdev_read_iter+0x105/0x170 fs/block_dev.c:1738
 [<ffffffff81612689>] generic_file_splice_read+0x2c9/0x4f0 fs/splice.c:309
 [<ffffffff81610ddc>] do_splice_to+0x10c/0x170 fs/splice.c:899
 [<ffffffff8161107f>] splice_direct_to_actor+0x23f/0x7e0 fs/splice.c:971
 [<ffffffff816117c3>] do_splice_direct+0x1a3/0x270 fs/splice.c:1080
 [<ffffffff81572dd0>] do_sendfile+0x4f0/0xc60 fs/read_write.c:1393
 [<ffffffff81574e51>] SYSC_sendfile64 fs/read_write.c:1448 [inline]
 [<ffffffff81574e51>] SyS_sendfile64+0xd1/0x160 fs/read_write.c:1440
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f4613>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/519:
 #0:  (rcu_read_lock){......}, at: [<ffffffff813646ec>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff813646ec>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81423c00>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3678:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d56bc>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3774:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f27e2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8211cc32>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
1 lock held by syz-executor7/15993:
 #0:  (sb_writers#5){.+.+.+}, at: [<ffffffff815731f8>] file_start_write include/linux/fs.h:2640 [inline]
 #0:  (sb_writers#5){.+.+.+}, at: [<ffffffff815731f8>] do_sendfile+0x918/0xc60 fs/read_write.c:1392
1 lock held by syz-executor7/16011:
 #0:  (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<ffffffff825c773b>] lo_ioctl+0x8b/0x1aa0 drivers/block/loop.c:1344

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

NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.100-g39c8566 #28
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d85cfd08 ffffffff81eb0f09 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b7da0 ffff8801d85cfd40
 ffffffff81ebc207 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb0f09>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb0f09>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebc207>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebc19a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b7ea4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81364c84>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81364c84>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81364c84>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81364c84>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119ad5d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f47dc>] 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 skipped: idling at pc 0xffffffff839f3246