INFO: task syz-executor1:2103 blocked for more than 140 seconds.
      Not tainted 4.9.148+ #3
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1   D24792  2103      1 0x00000004
 ffff8801cf63af80 0000000000000000 ffff8801db621000 ffffffff8302d180
 ffff8801db621018 ffff8801ad85f5b0 ffffffff828030e6 dffffc0000000000
 ffff8801ad85f588 ffffffff81206e91 00ffffff8280f1eb ffff8801db6218f0
Call Trace:
 [<ffffffff82804672>] schedule+0x92/0x1c0 kernel/sched/core.c:3553
 [<ffffffff8280f388>] rwsem_down_read_failed+0x258/0x3e0 kernel/locking/rwsem-xadd.c:260
 [<ffffffff81b76e68>] call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 [<ffffffff8280d182>] __down_read arch/x86/include/asm/rwsem.h:65 [inline]
 [<ffffffff8280d182>] down_read+0x52/0xb0 kernel/locking/rwsem.c:24
 [<ffffffff8152bfe0>] inode_lock_shared include/linux/fs.h:778 [inline]
 [<ffffffff8152bfe0>] lookup_slow+0x160/0x480 fs/namei.c:1686
 [<ffffffff8153b33e>] walk_component+0x71e/0xce0 fs/namei.c:1825
 [<ffffffff8153c197>] link_path_walk+0x897/0x1200 fs/namei.c:2161
 [<ffffffff8153d89e>] path_openat+0x18e/0x2f60 fs/namei.c:3580
 [<ffffffff81543451>] do_filp_open+0x1a1/0x280 fs/namei.c:3615
 [<ffffffff81507970>] do_sys_open+0x2f0/0x610 fs/open.c:1072
 [<ffffffff81507cbd>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff81507cbd>] SyS_open+0x2d/0x40 fs/open.c:1085
 [<ffffffff810056bd>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285
 [<ffffffff82813393>] 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: [<ffffffff8131b9bb>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131b9bb>] watchdog+0x11b/0xa40 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813fe89b>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336
2 locks held by getty/2017:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff82811463>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81d3763e>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
1 lock held by syz-executor1/2103:
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152bfe0>] inode_lock_shared include/linux/fs.h:778 [inline]
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152bfe0>] lookup_slow+0x160/0x480 fs/namei.c:1686
2 locks held by syz-executor0/14408:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff82811463>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81d3763e>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
1 lock held by syz-executor1/11394:
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152bfe0>] inode_lock_shared include/linux/fs.h:778 [inline]
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152bfe0>] lookup_slow+0x160/0x480 fs/namei.c:1686
1 lock held by syz-executor1/11405:
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152bfe0>] inode_lock_shared include/linux/fs.h:778 [inline]
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152bfe0>] lookup_slow+0x160/0x480 fs/namei.c:1686
1 lock held by syz-executor1/11415:
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152bfe0>] inode_lock_shared include/linux/fs.h:778 [inline]
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152bfe0>] lookup_slow+0x160/0x480 fs/namei.c:1686
1 lock held by syz-executor1/11448:
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152bfe0>] inode_lock_shared include/linux/fs.h:778 [inline]
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152bfe0>] lookup_slow+0x160/0x480 fs/namei.c:1686

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.148+ #3
 ffff8801d9907cd0 ffffffff81b456e1 0000000000000001 0000000000000000
 0000000000000001 ffffffff81097301 00000000003fffa3 ffff8801d9907d08
 ffffffff81b5096c 0000000000000001 0000000000000000 0000000000000001
Call Trace:
 [<ffffffff81b456e1>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b456e1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<ffffffff81b5096c>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81b508f4>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60
 [<ffffffff81097494>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8131be97>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8131be97>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8131be97>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8131be97>] watchdog+0x5f7/0xa40 kernel/hung_task.c:239
 [<ffffffff81141e38>] kthread+0x278/0x310 kernel/kthread.c:211
 [<ffffffff8281355c>] 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: 11412 Comm: syz-executor1 Not tainted 4.9.148+ #3
task: ffff88019ed3af80 task.stack: ffff8801a3088000
RIP: 0010:[<ffffffff8120c82d>] 
c [<ffffffff8120c82d>] __lock_release kernel/locking/lockdep.c:3546 [inline]
RIP: 0010:[<ffffffff8120c82d>] 
c [<ffffffff8120c82d>] lock_release+0x2ed/0xc30 kernel/locking/lockdep.c:3775
RSP: 0018:ffff8801a308f658  EFLAGS: 00000807
RAX: dffffc0000000000 RBX: ffff88019ed3b880 RCX: 0000000000000002
RDX: 1ffff10033da7714 RSI: ffff8801d53997b8 RDI: ffff88019ed3b8a4
RBP: ffff8801a308f700 R08: 0000000000000292 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: ffff88019ed3b858 R14: 0000000000000002 R15: ffff88019ed3b8a2
FS:  00007f849fb6f700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c42a686038 CR3: 00000001d4a34000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Stack:
 0000000000000046
c ffff88019ed3af80
c 0000000000000000
c 0000000000000000
c
 0000000000000000
c ffff8801a308f6f8
c 0000000000000046
c 0000000000000000
c
 ffffffff811eec2f
c ffff88019ed3b828
c ffff88019ed3b830
c 0000000000000046
c
Call Trace:
 [<ffffffff82812a5f>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
 [<ffffffff82812a5f>] _raw_spin_unlock_irqrestore+0x1f/0x70 kernel/locking/spinlock.c:191
 [<ffffffff811eecf8>] spin_unlock_irqrestore include/linux/spinlock.h:362 [inline]
 [<ffffffff811eecf8>] prepare_to_wait_event+0x128/0x750 kernel/sched/wait.c:238
 [<ffffffff8185cf19>] request_wait_answer+0x249/0x820 fs/fuse/dev.c:477
 [<ffffffff81861a49>] __fuse_request_send+0x109/0x1b0 fs/fuse/dev.c:498
 [<ffffffff81861b53>] fuse_request_send+0x63/0x70 fs/fuse/dev.c:511
 [<ffffffff81869644>] fuse_simple_request+0x2c4/0x660 fs/fuse/dev.c:569
 [<ffffffff81892ab6>] fuse_setxattr+0x1e6/0x320 fs/fuse/xattr.c:37
 [<ffffffff818936bc>] fuse_xattr_set+0x3c/0x70 fs/fuse/xattr.c:192
 [<ffffffff8158665e>] __vfs_setxattr+0x10e/0x170 fs/xattr.c:149
 [<ffffffff81588042>] __vfs_setxattr_noperm+0x102/0x3c0 fs/xattr.c:180
 [<ffffffff815883c5>] vfs_setxattr+0xc5/0xf0 fs/xattr.c:223
 [<ffffffff815885bf>] setxattr+0x1cf/0x320 fs/xattr.c:449
 [<ffffffff81588865>] path_setxattr+0x155/0x170 fs/xattr.c:468
 [<ffffffff81588c78>] SYSC_lsetxattr fs/xattr.c:490 [inline]
 [<ffffffff81588c78>] SyS_lsetxattr+0x38/0x50 fs/xattr.c:486
 [<ffffffff810056bd>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285
 [<ffffffff82813393>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c