INFO: task syz-executor1:4028 blocked for more than 140 seconds.
      Not tainted 4.9.130+ #46
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1   D28488  4028   2107 0x00000004
 ffff8801ca88af80 0000000000000000 ffff8801d2958000 ffff8801da6b2f80
 ffff8801db721018 ffff8801d9a976a0 ffffffff827f2d82 ffff8801d6377938
 ffff8801d9a97650 ffffffff81206c9b 0000000000000292 ffff8801db7218f0
Call Trace:
 [<ffffffff827f42af>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff8155c589>] d_wait_lookup fs/dcache.c:2455 [inline]
 [<ffffffff8155c589>] d_alloc_parallel+0x10a9/0x1710 fs/dcache.c:2537
 [<ffffffff8152a4df>] lookup_slow+0x1af/0x470 fs/namei.c:1650
 [<ffffffff81539b42>] walk_component+0x822/0xcf0 fs/namei.c:1784
 [<ffffffff8153b506>] lookup_last fs/namei.c:2266 [inline]
 [<ffffffff8153b506>] path_lookupat.isra.10+0x186/0x410 fs/namei.c:2283
 [<ffffffff8153f4e7>] filename_lookup.part.18+0x177/0x370 fs/namei.c:2317
 [<ffffffff8153f8a3>] filename_lookup fs/namei.c:2310 [inline]
 [<ffffffff8153f8a3>] user_path_at_empty+0x53/0x70 fs/namei.c:2578
 [<ffffffff81518e36>] user_path_at include/linux/namei.h:55 [inline]
 [<ffffffff81518e36>] vfs_fstatat+0xc6/0x170 fs/stat.c:106
 [<ffffffff8151a0d9>] vfs_lstat fs/stat.c:129 [inline]
 [<ffffffff8151a0d9>] SYSC_newlstat fs/stat.c:283 [inline]
 [<ffffffff8151a0d9>] SyS_newlstat+0x89/0x100 fs/stat.c:277
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff82803013>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/24:
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131b8dc>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131b8dc>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813fe0a4>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/2020:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff828010d2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81d2af12>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor1/4028:
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152a484>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152a484>] lookup_slow+0x154/0x470 fs/namei.c:1645

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.130+ #46
 ffff8801d9907d08 ffffffff81b36c89 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff81098180 ffff8801d9907d40
 ffffffff81b41d99 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81b36c89>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b36c89>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81b41d99>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81b41d2c>] nmi_trigger_cpumask_backtrace+0x12c/0x151 lib/nmi_backtrace.c:60
 [<ffffffff81098284>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8131be6d>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8131be6d>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8131be6d>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8131be6d>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff8114272d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff828031dc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4024 Comm: syz-executor1 Not tainted 4.9.130+ #46
task: ffff8801a3f88000 task.stack: ffff8801d6370000
RIP: 0010:[<ffffffff81207114>] 
c [<ffffffff81207114>] __lock_acquire+0x264/0x4a10 kernel/locking/lockdep.c:3262
RSP: 0018:ffff8801d6377180  EFLAGS: 00000802
RAX: ffff8801a3f888d8 RBX: 0000000000000050 RCX: 0000000000000000
RDX: 0000000000000001 RSI: dffffc0000000000 RDI: ffff8801a3f888f8
RBP: ffff8801d6377328 R08: 0000000000000001 R09: 0000000000000001
R10: ffff8801a3f88000 R11: 1ffff100347f111f R12: 000000000000046a
R13: 0000000000000002 R14: ffff8801cfd24a08 R15: 0000000000000000
FS:  00007fa94389d700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa0a8667000 CR3: 00000001d7531000 CR4: 00000000001606b0
DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Stack:
 ffff8801a3f888b0
c ffffed00347f1115
c ffff8801a3f88000
c dffffc0000000000
c
 ffff8801d63771f0
c ffffffff812068a7
c 0000000000000000
c ffff8801a3f888a8
c
 0000000600000007
c ffff8801a3f88000
c ffffffff83cdeaf0
c ffff8801d2958000
c
Call Trace:
 [<ffffffff8120c3d0>] lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756
 [<ffffffff8280255e>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:112 [inline]
 [<ffffffff8280255e>] _raw_spin_lock_irqsave+0x4e/0x70 kernel/locking/spinlock.c:159
 [<ffffffff811edf4e>] prepare_to_wait_event+0x6e/0x8c0 kernel/sched/wait.c:213
 [<ffffffff8185a2fe>] request_wait_answer+0x22e/0x820 fs/fuse/dev.c:470
 [<ffffffff8185ed09>] __fuse_request_send+0x109/0x1b0 fs/fuse/dev.c:491
 [<ffffffff8185ee0d>] fuse_request_send+0x5d/0x70 fs/fuse/dev.c:504
 [<ffffffff81866934>] fuse_simple_request+0x2f4/0x660 fs/fuse/dev.c:562
 [<ffffffff8186ef73>] fuse_lookup_name+0x253/0x5d0 fs/fuse/dir.c:369
 [<ffffffff8186f3e3>] fuse_lookup+0xf3/0x3b0 fs/fuse/dir.c:407
 [<ffffffff8152a57a>] lookup_slow+0x24a/0x470 fs/namei.c:1668
 [<ffffffff81539b42>] walk_component+0x822/0xcf0 fs/namei.c:1784
 [<ffffffff8153b506>] lookup_last fs/namei.c:2266 [inline]
 [<ffffffff8153b506>] path_lookupat.isra.10+0x186/0x410 fs/namei.c:2283
 [<ffffffff8153f4e7>] filename_lookup.part.18+0x177/0x370 fs/namei.c:2317
 [<ffffffff8153f8a3>] filename_lookup fs/namei.c:2310 [inline]
 [<ffffffff8153f8a3>] user_path_at_empty+0x53/0x70 fs/namei.c:2578
 [<ffffffff81518e36>] user_path_at include/linux/namei.h:55 [inline]
 [<ffffffff81518e36>] vfs_fstatat+0xc6/0x170 fs/stat.c:106
 [<ffffffff81519fe6>] vfs_stat fs/stat.c:123 [inline]
 [<ffffffff81519fe6>] SYSC_newstat fs/stat.c:270 [inline]
 [<ffffffff81519fe6>] SyS_newstat+0x86/0xf0 fs/stat.c:266
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff82803013>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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