INFO: task syz-executor5:11975 blocked for more than 120 seconds.
      Not tainted 4.9.77-ge12a9c4 #18
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor5   D29680 11975   3428 0x00000004
 ffff8801c8dbc800 ffff8801d909aa00 ffff8801bee4c540 ffff8801c8dbb000
 ffff8801db321b98 ffff8801c489f8e0 ffffffff838a1b9b 0000000041b58ab3
 ffffffff84193178 00ffffff8123bda0 ffff8801db322468 ffff8801db322490
Call Trace:
 [<ffffffff838a313f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3550
 [<ffffffff838af29c>] schedule_timeout+0x56c/0x10b0 kernel/time/timer.c:1768
 [<ffffffff838a134e>] io_schedule_timeout+0x1be/0x390 kernel/sched/core.c:5172
 [<ffffffff838a45b9>] io_schedule include/linux/sched.h:460 [inline]
 [<ffffffff838a45b9>] bit_wait_io+0x19/0xa0 kernel/sched/wait.c:582
 [<ffffffff838a3e22>] __wait_on_bit_lock+0xc2/0x1c0 kernel/sched/wait.c:421
 [<ffffffff81432c5f>] __lock_page+0xff/0x160 mm/filemap.c:934
 [<ffffffff81437de6>] lock_page include/linux/pagemap.h:454 [inline]
 [<ffffffff81437de6>] pagecache_get_page+0x436/0x710 mm/filemap.c:1216
 [<ffffffff8146c055>] find_lock_page include/linux/pagemap.h:284 [inline]
 [<ffffffff8146c055>] truncate_inode_pages_range+0x655/0x12c0 mm/truncate.c:320
 [<ffffffff8162baa1>] blkdev_fallocate+0x221/0x440 fs/block_dev.c:1817
 [<ffffffff8156565a>] vfs_fallocate+0x33a/0x5f0 fs/open.c:329
 [<ffffffff81568683>] SYSC_fallocate fs/open.c:352 [inline]
 [<ffffffff81568683>] SyS_fallocate+0x53/0x90 fs/open.c:346
 [<ffffffff838b2c2e>] entry_SYSCALL_64_fastpath+0x29/0xe8

Showing all locks held in the system:
2 locks held by khungtaskd/514:
 #0:  (rcu_read_lock){......}, at: [<ffffffff81372d85>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81372d85>] watchdog+0x125/0xa70 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81237f00>] debug_show_all_locks+0x70/0x280 kernel/locking/lockdep.c:4336
2 locks held by getty/3332:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff838b0e12>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff82009514>] n_tty_read+0x1f4/0x16c0 drivers/tty/n_tty.c:2133
1 lock held by syz-executor5/11975:
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff81565601>] sb_start_write include/linux/fs.h:1554 [inline]
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff81565601>] vfs_fallocate+0x2e1/0x5f0 fs/open.c:328
1 lock held by syz-executor5/11999:
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff81565601>] sb_start_write include/linux/fs.h:1554 [inline]
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff81565601>] vfs_fallocate+0x2e1/0x5f0 fs/open.c:328
1 lock held by syz-executor1/11977:
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff81565601>] sb_start_write include/linux/fs.h:1554 [inline]
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff81565601>] vfs_fallocate+0x2e1/0x5f0 fs/open.c:328
1 lock held by syz-executor4/11995:
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff81565601>] sb_start_write include/linux/fs.h:1554 [inline]
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff81565601>] vfs_fallocate+0x2e1/0x5f0 fs/open.c:328
1 lock held by syz-executor4/12002:
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff81565601>] sb_start_write include/linux/fs.h:1554 [inline]
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff81565601>] vfs_fallocate+0x2e1/0x5f0 fs/open.c:328

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

NMI backtrace for cpu 1
CPU: 1 PID: 514 Comm: khungtaskd Not tainted 4.9.77-ge12a9c4 #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d9b9fd00 ffffffff81d941c9 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810babe0 ffff8801d9b9fd38
 ffffffff81d9f2ed 0000000000000001 0000000000000000 ffff8801cab3b418
Call Trace:
 [<ffffffff81d941c9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d941c9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81d9f2ed>] nmi_cpu_backtrace+0xfd/0x120 lib/nmi_backtrace.c:99
 [<ffffffff81d9f427>] nmi_trigger_cpumask_backtrace+0x117/0x190 lib/nmi_backtrace.c:60
 [<ffffffff810bacd4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81373350>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81373350>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81373350>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81373350>] watchdog+0x6f0/0xa70 kernel/hung_task.c:239
 [<ffffffff8119a6fd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff838b2f69>] ret_from_fork+0x59/0x70 arch/x86/entry/entry_64.S:466
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff838b1886