INFO: task syz-executor6:7507 blocked for more than 120 seconds.
      Not tainted 4.9.78-g29eadc4 #20
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor6   D29680  7507   3419 0x00000004
 ffff8801d184b000 0000000000000000 ffff8801d48ab9c0 ffff8801d60b3000
 ffff8801db221b98 ffff8801d1d078e0 ffffffff838a1bbb 0000000041b58ab3
 ffffffff84193238 00ffffff8123be20 ffff8801db222468 ffff8801db222490
Call Trace:
 [<ffffffff838a315f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3550
 [<ffffffff838af2bc>] schedule_timeout+0x56c/0x10b0 kernel/time/timer.c:1768
 [<ffffffff838a136e>] io_schedule_timeout+0x1be/0x390 kernel/sched/core.c:5172
 [<ffffffff838a45d9>] io_schedule include/linux/sched.h:460 [inline]
 [<ffffffff838a45d9>] bit_wait_io+0x19/0xa0 kernel/sched/wait.c:582
 [<ffffffff838a3e42>] __wait_on_bit_lock+0xc2/0x1c0 kernel/sched/wait.c:421
 [<ffffffff81432cef>] __lock_page+0xff/0x160 mm/filemap.c:934
 [<ffffffff81437e76>] lock_page include/linux/pagemap.h:454 [inline]
 [<ffffffff81437e76>] pagecache_get_page+0x436/0x710 mm/filemap.c:1216
 [<ffffffff8146c0e5>] find_lock_page include/linux/pagemap.h:284 [inline]
 [<ffffffff8146c0e5>] truncate_inode_pages_range+0x655/0x12c0 mm/truncate.c:320
 [<ffffffff8162bb91>] blkdev_fallocate+0x221/0x440 fs/block_dev.c:1817
 [<ffffffff815656ea>] vfs_fallocate+0x33a/0x5f0 fs/open.c:329
 [<ffffffff81568713>] SYSC_fallocate fs/open.c:352 [inline]
 [<ffffffff81568713>] SyS_fallocate+0x53/0x90 fs/open.c:346
 [<ffffffff838b2c6e>] entry_SYSCALL_64_fastpath+0x29/0xe8

Showing all locks held in the system:
2 locks held by khungtaskd/514:
 #0:  (rcu_read_lock){......}, at: [<ffffffff81372df5>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81372df5>] watchdog+0x125/0xa70 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81237f80>] debug_show_all_locks+0x70/0x280 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3190:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d32ef>] __fdget_pos+0x9f/0xc0 fs/file.c:781
2 locks held by getty/3318:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff838b0e32>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff820096f4>] n_tty_read+0x1f4/0x16c0 drivers/tty/n_tty.c:2133
1 lock held by syz-executor6/7507:
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff81565691>] sb_start_write include/linux/fs.h:1554 [inline]
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff81565691>] vfs_fallocate+0x2e1/0x5f0 fs/open.c:328
1 lock held by syz-executor6/7522:
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff81565691>] sb_start_write include/linux/fs.h:1554 [inline]
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff81565691>] vfs_fallocate+0x2e1/0x5f0 fs/open.c:328

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

NMI backtrace for cpu 1
CPU: 1 PID: 514 Comm: khungtaskd Not tainted 4.9.78-g29eadc4 #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d89c7d00 ffffffff81d943a9 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810bac10 ffff8801d89c7d38
 ffffffff81d9f4cd 0000000000000001 0000000000000000 ffff8801d4ef3418
Call Trace:
 [<ffffffff81d943a9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d943a9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81d9f4cd>] nmi_cpu_backtrace+0xfd/0x120 lib/nmi_backtrace.c:99
 [<ffffffff81d9f607>] nmi_trigger_cpumask_backtrace+0x117/0x190 lib/nmi_backtrace.c:60
 [<ffffffff810bad04>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff813733c0>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff813733c0>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff813733c0>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff813733c0>] watchdog+0x6f0/0xa70 kernel/hung_task.c:239
 [<ffffffff8119a72d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff838b2fdc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:477
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.78-g29eadc4 #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffffffff84429880 task.stack: ffffffff84400000
RIP: 0010:[<ffffffff811cb93c>] 
c [<ffffffff811cb93c>] got_nohz_idle_kick kernel/sched/core.c:623 [inline]
RIP: 0010:[<ffffffff811cb93c>] 
c [<ffffffff811cb93c>] scheduler_ipi+0xec/0x4f0 kernel/sched/core.c:1849
RSP: 0018:ffff8801db207fa8  EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000021b80 RCX: 1ffffffff083fe7c
RDX: dffffc0000000000 RSI: ffffffff83c18780 RDI: ffffffff841ff3e0
RBP: ffff8801db207fd0 R08: 0000000000000001 R09: ffff88021fffd008
R10: ffff88021fffd018 R11: ffff88021fffd010 R12: 0000000000021b80
R13: ffff8801db200000 R14: ffffffff84429880 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8b8aa62533 CR3: 00000001cfd8c000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff84429880
c ffffffff841ff840
c 0000000000000000
c ffffffff84a36a78
c
 0000000000000000
c ffff8801db207fe8
c ffffffff838b74e6
c ffffffff84a27968
c
 ffffffff84407dc0
c ffffffff838b5100
c ffffffff84407d18
c <EOI> 
c 0000000000000000
c
Call Trace:
 <IRQ> 
d [<ffffffff838b74e6>] __smp_reschedule_interrupt arch/x86/kernel/smp.c:259 [inline]
 <IRQ> 
d [<ffffffff838b74e6>] smp_reschedule_interrupt+0x66/0x80 arch/x86/kernel/smp.c:266
 [<ffffffff838b5100>] reschedule_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:775
 <EOI> 
d [<ffffffff838b18a6>] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53
 [<ffffffff838b0ed5>] arch_safe_halt arch/x86/include/asm/paravirt.h:103 [inline]
 [<ffffffff838b0ed5>] default_idle+0x55/0x360 arch/x86/kernel/process.c:295
 [<ffffffff8106bc9a>] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:286
 [<ffffffff838b1ce6>] default_idle_call+0x36/0x60 kernel/sched/idle.c:97
 [<ffffffff81226580>] cpuidle_idle_call kernel/sched/idle.c:155 [inline]
 [<ffffffff81226580>] cpu_idle_loop kernel/sched/idle.c:248 [inline]
 [<ffffffff81226580>] cpu_startup_entry+0x2b0/0x380 kernel/sched/idle.c:303
 [<ffffffff8389e804>] rest_init+0x184/0x190 init/main.c:408
 [<ffffffff84a6f8b6>] start_kernel+0x688/0x6bd init/main.c:663
 [<ffffffff84a6e29d>] x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:196
 [<ffffffff84a6e3df>] x86_64_start_kernel+0x140/0x163 arch/x86/kernel/head64.c:177
Code: 
cff 
ce8 
c89 
c00 
cc3 
c00 
c48 
cba 
c00 
c00 
c00 
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cfc 
cff 
cdf 
c48 
c98 
c48 
c8d 
c3c 
cc5 
ce0 
cf3 
c1f 
c84 
c48 
c89 
cf9 
c48 
cc1 
ce9 
c03 
c80 
c3c 
c11 
c00 
c0f 
c85 
c9c 
c03 
c00 
c00 
c<4c> 
c8b 
c2c 
cc5 
ce0 
cf3 
c1f 
c84 
c48 
cb8 
c00 
c00 
c00 
c00 
c00 
cfc 
cff 
cdf 
c4d 
c01 
cec 
c