INFO: task syz-executor1:6783 blocked for more than 120 seconds.
      Not tainted 4.9.96-g71fce1e #13
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1   D27240  6783   3879 0x00000004
 ffff8801c11d8000 0000000000000000 ffff8801c2632f40 ffff8801ccff6000
 ffff8801db321b98 ffff88019a817320 ffffffff839e240d 1ffff10033502e58
 ffffffff85342240 0000000041b58ab3 00ffffff841c08a0 ffff8801db322468
Call Trace:
 [<ffffffff839e3a0f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839efe21>] schedule_timeout+0x861/0xf70 kernel/time/timer.c:1768
 [<ffffffff839e1bea>] io_schedule_timeout+0x1ba/0x390 kernel/sched/core.c:5180
 [<ffffffff8164082b>] io_schedule include/linux/sched.h:460 [inline]
 [<ffffffff8164082b>] dio_await_one fs/direct-io.c:461 [inline]
 [<ffffffff8164082b>] dio_await_completion fs/direct-io.c:515 [inline]
 [<ffffffff8164082b>] do_blockdev_direct_IO+0x2d5b/0x5a80 fs/direct-io.c:1331
 [<ffffffff816435f5>] __blockdev_direct_IO+0xa5/0xd0 fs/direct-io.c:1360
 [<ffffffff8162d1a0>] blkdev_direct_IO+0xa0/0xd0 fs/block_dev.c:183
 [<ffffffff8143c760>] generic_file_read_iter+0x660/0x1a90 mm/filemap.c:1951
 [<ffffffff8162fda5>] blkdev_read_iter+0x105/0x170 fs/block_dev.c:1738
 [<ffffffff816127a9>] generic_file_splice_read+0x2c9/0x4f0 fs/splice.c:309
 [<ffffffff81610efc>] do_splice_to+0x10c/0x170 fs/splice.c:899
 [<ffffffff8161119f>] splice_direct_to_actor+0x23f/0x7e0 fs/splice.c:971
 [<ffffffff816118e3>] do_splice_direct+0x1a3/0x270 fs/splice.c:1080
 [<ffffffff81572eb0>] do_sendfile+0x4f0/0xc60 fs/read_write.c:1393
 [<ffffffff81574f31>] SYSC_sendfile64 fs/read_write.c:1448 [inline]
 [<ffffffff81574f31>] SyS_sendfile64+0xd1/0x160 fs/read_write.c:1440
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f3313>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/518:
 #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: [<ffffffff81423ce0>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3776:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f14b2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8211c792>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133

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

NMI backtrace for cpu 0
CPU: 0 PID: 518 Comm: khungtaskd Not tainted 4.9.96-g71fce1e #13
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d85f7d08 ffffffff81eb0b69 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b7d60 ffff8801d85f7d40
 ffffffff81ebbe97 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb0b69>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb0b69>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebbe97>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebbe2a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b7e64>] 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
 [<ffffffff839f34dc>] 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
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.96-g71fce1e #13
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9a6b000 task.stack: ffff8801d9a80000
RIP: 0010:[<ffffffff812821ca>] 
c [<ffffffff812821ca>] rcu_lockdep_current_cpu_online+0x7a/0x140 kernel/rcu/tree.c:1106
RSP: 0018:ffff8801db307f30  EFLAGS: 00000082
RAX: dffffc0000000000 RBX: ffff8801db322b40 RCX: 1ffffffff084607d
RDX: dffffc0000000000 RSI: ffffffff81f185fb RDI: ffffffff842303e8
RBP: ffff8801db307f50 R08: 0000000000000001 R09: 0000000000000004
R10: ffffed0043fffa09 R11: 0000000000000001 R12: ffff8801d9a6b000
R13: ffff8801db300000 R14: ffff8801d9a6b000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f148cec5000 CR3: 00000001c99fb000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801db307f50
c ffffffff84670420
c ffff8801d9a6b000
c ffff8801db300000
c
 ffff8801db307f68
c ffffffff8127a206
c 0000000000000007
c ffff8801db307f98
c
 ffffffff81149109
c ffff8801db321b80
c ffff8801d9a6b000
c ffff8801db300000
c
Call Trace:
 <IRQ> 
d [<ffffffff8127a206>] rcu_read_lock_sched_held+0x96/0x120 kernel/rcu/update.c:109
 [<ffffffff81149109>] trace_softirq_raise include/trace/events/irq.h:155 [inline]
 [<ffffffff81149109>] __raise_softirq_irqoff kernel/softirq.c:443 [inline]
 [<ffffffff81149109>] raise_softirq_irqoff+0x89/0x1e0 kernel/softirq.c:417
 [<ffffffff811ce351>] scheduler_ipi+0x291/0x4e0 kernel/sched/core.c:1853
 [<ffffffff839f7a9c>] __smp_reschedule_interrupt arch/x86/kernel/smp.c:262 [inline]
 [<ffffffff839f7a9c>] smp_reschedule_interrupt+0x6c/0x90 arch/x86/kernel/smp.c:269
 [<ffffffff839f5610>] reschedule_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:671
 <EOI> 
d [<ffffffff839f1f16>] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53
 [<ffffffff839f1555>] arch_safe_halt arch/x86/include/asm/paravirt.h:104 [inline]
 [<ffffffff839f1555>] default_idle+0x55/0x360 arch/x86/kernel/process.c:295
 [<ffffffff81069fa0>] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:286
 [<ffffffff839f2375>] default_idle_call+0x45/0x60 kernel/sched/idle.c:97
 [<ffffffff81220e65>] cpuidle_idle_call kernel/sched/idle.c:155 [inline]
 [<ffffffff81220e65>] cpu_idle_loop kernel/sched/idle.c:248 [inline]
 [<ffffffff81220e65>] cpu_startup_entry+0x2b5/0x380 kernel/sched/idle.c:303
 [<ffffffff810ad1f3>] start_secondary+0x323/0x400 arch/x86/kernel/smpboot.c:254
Code: 
c48 
c8d 
c3c 
cc5 
ce0 
c03 
c23 
c84 
c48 
c89 
cf9 
c48 
cc1 
ce9 
c03 
c80 
c3c 
c11 
c00 
c0f 
c85 
ca3 
c00 
c00 
c00 
c48 
c03 
c1c 
cc5 
ce0 
c03 
c23 
c84 
c48 
cb8 
c00 
c00 
c00 
c00 
c00 
cfc 
cff 
cdf 
c<48> 
c8d 
c7b 
c20 
c48 
c89 
cfa 
c48 
cc1 
cea 
c03 
c80 
c3c 
c02 
c00 
c0f 
c85 
c8e 
c00 
c00 
c00 
c