INFO: task syz-executor.3:3160 blocked for more than 140 seconds.
      Not tainted 4.9.186+ #12
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3  D25528  3160      1 0x00000004
 0000000000000083 ffff8801b1df0000 0000000000000000 ffff8801db721000
 ffff8801da6b2f80 ffff8801db721018 ffff8801b1dff5b0 ffffffff8280c55e
 ffff8801b1dff678 ffff8801b1df0000 00ff8801b1dff500 ffff8801db7218f0
Call Trace:
 [<000000001013e3ef>] schedule+0x92/0x1c0 kernel/sched/core.c:3546
 [<000000002bd63365>] rwsem_down_read_failed+0x258/0x3e0 kernel/locking/rwsem-xadd.c:283
 [<0000000093ad8587>] call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 [<00000000335a1c54>] __down_read arch/x86/include/asm/rwsem.h:65 [inline]
 [<00000000335a1c54>] down_read+0x52/0xb0 kernel/locking/rwsem.c:24
 [<0000000081b57f81>] inode_lock_shared include/linux/fs.h:781 [inline]
 [<0000000081b57f81>] lookup_slow+0x160/0x480 fs/namei.c:1686
 [<000000000adcecb1>] walk_component+0x71e/0xce0 fs/namei.c:1825
 [<00000000fbd156b6>] link_path_walk+0x897/0x1200 fs/namei.c:2161
 [<000000003a919191>] path_openat+0x18e/0x2f60 fs/namei.c:3580
 [<000000007109b675>] do_filp_open+0x1a1/0x280 fs/namei.c:3615
 [<0000000093e6c970>] do_sys_open+0x2f0/0x610 fs/open.c:1078
 [<000000001fe3b570>] SYSC_open fs/open.c:1096 [inline]
 [<000000001fe3b570>] SyS_open+0x2d/0x40 fs/open.c:1091
 [<0000000047b69876>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
 [<00000000e46d078b>] 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: [<000000003b19d626>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline]
 #0:  (rcu_read_lock){......}, at: [<000000003b19d626>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263
 #1:  (tasklist_lock){.+.+..}, at: [<00000000f21e1fa9>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336
2 locks held by getty/2034:
 #0:  (&tty->ldisc_sem){++++++}, at: [<00000000965b8a65>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<00000000e9b623c8>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
1 lock held by syz-executor.3/3160:
 #0:  (&type->i_mutex_dir_key#8){++++++}, at: [<0000000081b57f81>] inode_lock_shared include/linux/fs.h:781 [inline]
 #0:  (&type->i_mutex_dir_key#8){++++++}, at: [<0000000081b57f81>] lookup_slow+0x160/0x480 fs/namei.c:1686
1 lock held by syz-executor.3/458:
 #0:  (&type->i_mutex_dir_key#8){++++++}, at: [<0000000081b57f81>] inode_lock_shared include/linux/fs.h:781 [inline]
 #0:  (&type->i_mutex_dir_key#8){++++++}, at: [<0000000081b57f81>] lookup_slow+0x160/0x480 fs/namei.c:1686

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

NMI backtrace for cpu 0
CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.186+ #12
 ffff8801d98d7cc8 ffffffff81b5a0b1 0000000000000000 0000000000000000
 0000000000000000 ffffffff81099a01 dffffc0000000000 ffff8801d98d7d00
 ffffffff81b6534c 0000000000000000 0000000000000000 0000000000000000
Call Trace:
 [<00000000c26e85f8>] __dump_stack lib/dump_stack.c:15 [inline]
 [<00000000c26e85f8>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<000000006066e766>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99
 [<000000003e759e8b>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60
 [<000000004902df8d>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<0000000046273957>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<0000000046273957>] check_hung_task kernel/hung_task.c:126 [inline]
 [<0000000046273957>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline]
 [<0000000046273957>] watchdog+0x670/0xaf0 kernel/hung_task.c:263
 [<00000000e1b08713>] kthread+0x278/0x310 kernel/kthread.c:211
 [<00000000bc84217f>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 464 Comm: syz-executor.3 Not tainted 4.9.186+ #12
task: 0000000040fa3752 task.stack: 00000000746e4c34
RIP: 0010:[<ffffffff8120b18f>] 
c [<00000000070aa9dc>] mark_held_locks+0x4f/0x100 kernel/locking/lockdep.c:2648
RSP: 0018:ffff8801af5e7698  EFLAGS: 00000002
RAX: 0000000000000002 RBX: ffff8801aed52f80 RCX: 1ffff10035daa70f
RDX: 1ffff10035daa705 RSI: 0000000000000001 RDI: ffff8801aed53828
RBP: ffff8801af5e76d0 R08: 0000000000000292 R09: ffff8801aed53878
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004
R13: 1ffff10035ebceeb R14: ffff8801aed52f80 R15: ffff8801af5e7840
FS:  00007f894095e700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbbaba4e000 CR3: 00000001d290c000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff811f2f8f
c 00000003aed53828
c ffff8801aed52f80
c ffffffff8281c22a
c
 1ffff10035ebceeb
c fffffffffffffe00
c ffff8801af5e7840
c ffff8801af5e76f0
c
 ffffffff8120b5c5
c 0000000000000292
c ffff8801cdac8318
c ffff8801af5e7700
c
Call Trace:
 [<000000009354d3e6>] __trace_hardirqs_on_caller kernel/locking/lockdep.c:2689 [inline]
 [<000000009354d3e6>] trace_hardirqs_on_caller+0x385/0x5a0 kernel/locking/lockdep.c:2736
 [<000000001b7b9807>] trace_hardirqs_on+0xd/0x10 kernel/locking/lockdep.c:2743
 [<00000000a4986434>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:162 [inline]
 [<00000000a4986434>] _raw_spin_unlock_irqrestore+0x5a/0x70 kernel/locking/spinlock.c:191
 [<00000000e6c92c28>] spin_unlock_irqrestore include/linux/spinlock.h:362 [inline]
 [<00000000e6c92c28>] prepare_to_wait_event+0x128/0x750 kernel/sched/wait.c:238
 [<00000000dc794b6c>] request_wait_answer+0x249/0x820 fs/fuse/dev.c:477
 [<000000007f36b3e8>] __fuse_request_send+0x109/0x1b0 fs/fuse/dev.c:498
 [<000000007cf2f79f>] fuse_request_send+0x63/0x70 fs/fuse/dev.c:511
 [<000000003646e9a8>] fuse_simple_request+0x2c4/0x660 fs/fuse/dev.c:569
 [<00000000695c1051>] fuse_setxattr+0x1e6/0x320 fs/fuse/xattr.c:37
 [<00000000bc57d2b1>] fuse_xattr_set+0x3c/0x70 fs/fuse/xattr.c:192
 [<000000002181a230>] __vfs_setxattr+0x10e/0x170 fs/xattr.c:149
 [<00000000c8d5cc51>] __vfs_setxattr_noperm+0x102/0x3c0 fs/xattr.c:180
 [<0000000053fd46ae>] vfs_setxattr+0xc5/0xf0 fs/xattr.c:223
 [<000000007cf84132>] setxattr+0x1cf/0x320 fs/xattr.c:449
 [<000000002699c325>] path_setxattr+0x155/0x170 fs/xattr.c:468
 [<000000004a0a966a>] SYSC_lsetxattr fs/xattr.c:490 [inline]
 [<000000004a0a966a>] SyS_lsetxattr+0x38/0x50 fs/xattr.c:486
 [<0000000047b69876>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
 [<00000000e46d078b>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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