EXT4-fs (loop1): inodes count not valid: 378 vs 256
IPVS: stopping master sync thread 16390 ...
INFO: task syz-executor0:24994 blocked for more than 140 seconds.
      Not tainted 4.9.113-g9905591 #14
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D26536 24994  23504 0x00000004
 ffff8801d8820000 ffff8801cd11ca80 ffff880198f464c0 ffff88019b256000
 ffff8801db321c18 ffff8801ba12f650 ffffffff839e929d dffffc0000000000
 ffff8801bb10c7f0 ffff8801ba12f610 00ff8801d88208c0 ffff8801db3224e8
Call Trace:
 [<ffffffff839ea89f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff815c7d52>] d_wait_lookup fs/dcache.c:2455 [inline]
 [<ffffffff815c7d52>] d_alloc_parallel+0xeb2/0x17c0 fs/dcache.c:2537
 [<ffffffff81594d0c>] lookup_slow+0x19c/0x470 fs/namei.c:1650
 [<ffffffff815a1336>] walk_component+0x716/0x1bb0 fs/namei.c:1784
 [<ffffffff815a3c96>] lookup_last fs/namei.c:2266 [inline]
 [<ffffffff815a3c96>] path_lookupat.isra.41+0x186/0x410 fs/namei.c:2283
 [<ffffffff815a9747>] filename_lookup.part.55+0x177/0x370 fs/namei.c:2317
 [<ffffffff815a9b03>] filename_lookup fs/namei.c:2310 [inline]
 [<ffffffff815a9b03>] user_path_at_empty+0x53/0x70 fs/namei.c:2578
 [<ffffffff81580ae6>] user_path_at include/linux/namei.h:55 [inline]
 [<ffffffff81580ae6>] vfs_fstatat+0xc6/0x170 fs/stat.c:106
 [<ffffffff81581d89>] vfs_lstat fs/stat.c:129 [inline]
 [<ffffffff81581d89>] SYSC_newlstat+0x89/0x100 fs/stat.c:283
 [<ffffffff815820cd>] SyS_newlstat+0x1d/0x30 fs/stat.c:277
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fa193>] 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: [<ffffffff8136675c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136675c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81425de7>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3747:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f8342>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff8211ee22>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor0/24994:
 #0:  (&type->i_mutex_dir_key#5){++++++}, at: [<ffffffff81594cb1>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&type->i_mutex_dir_key#5){++++++}, at: [<ffffffff81594cb1>] lookup_slow+0x141/0x470 fs/namei.c:1645
1 lock held by syz-executor0/25027:
 #0:  (&type->i_mutex_dir_key#5){++++++}, at: [<ffffffff81594cb1>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&type->i_mutex_dir_key#5){++++++}, at: [<ffffffff81594cb1>] lookup_slow+0x141/0x470 fs/namei.c:1645
1 lock held by syz-executor0/25081:
 #0:  (&type->i_mutex_dir_key#5){++++++}, at: [<ffffffff81594cb1>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&type->i_mutex_dir_key#5){++++++}, at: [<ffffffff81594cb1>] lookup_slow+0x141/0x470 fs/namei.c:1645

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

NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.113-g9905591 #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d85d7d08 ffffffff81eb32a9 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b9bd0 ffff8801d85d7d40
 ffffffff81ebe5a7 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb32a9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb32a9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebe5a7>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebe53a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b9cd4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81366cf4>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366cf4>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366cf4>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366cf4>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d0ad>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839fa35c>] 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: 25005 Comm: syz-executor0 Not tainted 4.9.113-g9905591 #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d72bc800 task.stack: ffff8801b1210000
RIP: 0010:[<ffffffff81230205>] 
c [<ffffffff81230205>] __lock_is_held+0x85/0xf0 kernel/locking/lockdep.c:3594
RSP: 0018:ffff8801b1217370  EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff8801d72bc800 RCX: ffffc90009161000
RDX: 0000000000000000 RSI: ffffffff846def20 RDI: ffff8801d72bd0ea
RBP: ffff8801b12173a0 R08: ffff8801d72bd110 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffed003ae57a18
R13: ffff8801d72bd0c8 R14: ffffffff846def20 R15: 0000000000000001
FS:  00007fe15cd36700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7436975000 CR3: 00000001c9c84000 CR4: 00000000001606f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffff8801d72bd0c0
c 0000000000000246
c ffff8801d72bc800
c ffffffff846def20
c
 00000000000001cc
c ffff8801ca6554b8
c ffff8801b12173c8
c ffffffff81230a54
c
 ffff8801d72bc800
c 0000000000000000
c ffffffff83db4480
c ffff8801b1217400
c
Call Trace:
 [<ffffffff81230a54>] lock_is_held+0xb4/0x140 kernel/locking/lockdep.c:3794
 [<ffffffff811bb557>] ___might_sleep+0x1c7/0x260 kernel/sched/core.c:7954
 [<ffffffff811bb685>] __might_sleep+0x95/0x1a0 kernel/sched/core.c:7945
 [<ffffffff81907ab4>] request_wait_answer+0x124/0x6e0 fs/fuse/dev.c:459
 [<ffffffff819086c9>] __fuse_request_send+0x109/0x1b0 fs/fuse/dev.c:480
 [<ffffffff819087cd>] fuse_request_send+0x5d/0x70 fs/fuse/dev.c:493
 [<ffffffff81912a24>] fuse_simple_request+0x2f4/0x660 fs/fuse/dev.c:551
 [<ffffffff8191adc3>] fuse_lookup_name+0x253/0x5d0 fs/fuse/dir.c:369
 [<ffffffff8191b22d>] fuse_lookup+0xed/0x3a0 fs/fuse/dir.c:406
 [<ffffffff81594dae>] lookup_slow+0x23e/0x470 fs/namei.c:1668
 [<ffffffff815a1336>] walk_component+0x716/0x1bb0 fs/namei.c:1784
 [<ffffffff815a3c96>] lookup_last fs/namei.c:2266 [inline]
 [<ffffffff815a3c96>] path_lookupat.isra.41+0x186/0x410 fs/namei.c:2283
 [<ffffffff815a9747>] filename_lookup.part.55+0x177/0x370 fs/namei.c:2317
 [<ffffffff815a9b03>] filename_lookup fs/namei.c:2310 [inline]
 [<ffffffff815a9b03>] user_path_at_empty+0x53/0x70 fs/namei.c:2578
 [<ffffffff81580ae6>] user_path_at include/linux/namei.h:55 [inline]
 [<ffffffff81580ae6>] vfs_fstatat+0xc6/0x170 fs/stat.c:106
 [<ffffffff81581d89>] vfs_lstat fs/stat.c:129 [inline]
 [<ffffffff81581d89>] SYSC_newlstat+0x89/0x100 fs/stat.c:283
 [<ffffffff815820cd>] SyS_newlstat+0x1d/0x30 fs/stat.c:277
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fa193>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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