INFO: task syz-executor7:7562 blocked for more than 120 seconds.
      Not tainted 4.9.78-g7be1985 #24
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor7   D29680  7562   4118 0x00000004
 ffff8801cc0e4800 ffff8801cd576a00 ffff8801cb68d500 ffff8801ca9c6000
 ffff8801db221b98 ffff8801b025f940 ffffffff838a1bbb 0000000041b58ab3
 ffffffff84193238 00ffffff8123be70 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
 [<ffffffff81432d3f>] __lock_page+0xff/0x160 mm/filemap.c:934
 [<ffffffff8146c6fa>] lock_page include/linux/pagemap.h:454 [inline]
 [<ffffffff8146c6fa>] truncate_inode_pages_range+0xc1a/0x12c0 mm/truncate.c:373
 [<ffffffff8162bbe1>] blkdev_fallocate+0x221/0x440 fs/block_dev.c:1817
 [<ffffffff8156573a>] vfs_fallocate+0x33a/0x5f0 fs/open.c:329
 [<ffffffff81568763>] SYSC_fallocate fs/open.c:352 [inline]
 [<ffffffff81568763>] 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: [<ffffffff81372e45>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81372e45>] watchdog+0x125/0xa70 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81237fd0>] debug_show_all_locks+0x70/0x280 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3905:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d333f>] __fdget_pos+0x9f/0xc0 fs/file.c:781
2 locks held by getty/4033:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff838b0e32>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff82009754>] n_tty_read+0x1f4/0x16c0 drivers/tty/n_tty.c:2133
1 lock held by syz-executor7/7562:
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff815656e1>] sb_start_write include/linux/fs.h:1554 [inline]
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff815656e1>] vfs_fallocate+0x2e1/0x5f0 fs/open.c:328
1 lock held by syz-executor7/7573:
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff815656e1>] sb_start_write include/linux/fs.h:1554 [inline]
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff815656e1>] vfs_fallocate+0x2e1/0x5f0 fs/open.c:328

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

NMI backtrace for cpu 0
CPU: 0 PID: 514 Comm: khungtaskd Not tainted 4.9.78-g7be1985 #24
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d875fd00 ffffffff81d94409 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810bac10 ffff8801d875fd38
 ffffffff81d9f52d 0000000000000000 0000000000000000 ffff8801b023e418
Call Trace:
 [<ffffffff81d94409>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d94409>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81d9f52d>] nmi_cpu_backtrace+0xfd/0x120 lib/nmi_backtrace.c:99
 [<ffffffff81d9f667>] 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
 [<ffffffff81373410>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81373410>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81373410>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81373410>] 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.78-g7be1985 #24
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9b73000 task.stack: ffff8801d9b88000
RIP: 0010:[<ffffffff81287510>] 
c [<ffffffff81287510>] debug_lockdep_rcu_enabled+0x20/0x90 kernel/rcu/update.c:264
RSP: 0018:ffff8801db307f98  EFLAGS: 00000803
RAX: dffffc0000000000 RBX: ffff8801db31a690 RCX: 1ffffffff083fe7d
RDX: 0000000000000000 RSI: ffffffff83c18780 RDI: ffffffff84a36b44
RBP: ffff8801db307f98 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffffffff84a36a78 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000b91000 CR3: 00000001bdfd4000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801db307fb8
c ffffffff812966bf
c 0000000000000000
c ffffffff84a27968
c
 ffff8801db307fd0
c ffffffff811469ba
c ffffffff84a27968
c ffff8801db307fe8
c
 ffffffff838b748a
c ffffffff84a27968
c ffff8801d9b8fd98
c ffffffff838b5100
c
Call Trace:
 <IRQ> 
d [<ffffffff812966bf>] rcu_irq_enter+0x7f/0x120 kernel/rcu/tree.c:944
 [<ffffffff811469ba>] irq_enter+0xa/0xd0 kernel/softirq.c:338
 [<ffffffff838b748a>] smp_reschedule_interrupt+0xa/0x80 arch/x86/kernel/smp.c:264
 [<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
 [<ffffffff812265d0>] cpuidle_idle_call kernel/sched/idle.c:155 [inline]
 [<ffffffff812265d0>] cpu_idle_loop kernel/sched/idle.c:248 [inline]
 [<ffffffff812265d0>] cpu_startup_entry+0x2b0/0x380 kernel/sched/idle.c:303
 [<ffffffff810afcc3>] start_secondary+0x303/0x3e0 arch/x86/kernel/smpboot.c:254
Code: 
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c