INFO: task syz-executor5:21168 blocked for more than 140 seconds.
      Not tainted 4.9.124+ #32
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor5   D27928 21168   2311 0x00000004
 ffff8801ba3d2f80 ffff8801d2ddbc80 ffff8801a8c81080 ffff8801b9ef5f00
 ffff8801db6210d8 ffff8801a9c3fa40 ffffffff8277c942 ffff8801a9c3fa18
 ffffffff81201f37 0000000000000000 00ff8801ba3d3828 ffff8801db6219b0
Call Trace:
 [<ffffffff8277de6f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff82786f16>] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline]
 [<ffffffff82786f16>] rwsem_down_write_failed+0x336/0x5a0 kernel/locking/rwsem-xadd.c:555
 [<ffffffff81b26657>] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
 [<ffffffff82785dac>] __down_write arch/x86/include/asm/rwsem.h:125 [inline]
 [<ffffffff82785dac>] down_write+0x5c/0xa0 kernel/locking/rwsem.c:54
 [<ffffffff81566d1c>] inode_lock include/linux/fs.h:766 [inline]
 [<ffffffff81566d1c>] lock_mount+0x8c/0x2c0 fs/namespace.c:2101
 [<ffffffff81569ed7>] do_add_mount+0x27/0x330 fs/namespace.c:2484
 [<ffffffff8156bba0>] do_new_mount fs/namespace.c:2551 [inline]
 [<ffffffff8156bba0>] do_mount+0x1330/0x2790 fs/namespace.c:2859
 [<ffffffff8156d9ca>] SYSC_mount fs/namespace.c:3075 [inline]
 [<ffffffff8156d9ca>] SyS_mount+0xea/0x100 fs/namespace.c:3052
 [<ffffffff8100554f>] do_syscall_64+0x19f/0x480 arch/x86/entry/common.c:282
 [<ffffffff8278ba53>] 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: [<ffffffff8131401c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131401c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813f93a9>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/2220:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff82789b12>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81cddf12>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor5/21168:
 #0:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff81566d1c>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff81566d1c>] lock_mount+0x8c/0x2c0 fs/namespace.c:2101
1 lock held by syz-executor5/21197:
 #0:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff8151ccd4>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff8151ccd4>] lookup_slow+0x154/0x470 fs/namei.c:1645
2 locks held by syz-executor5/21247:
 #0:  (sb_writers#13){.+.+.+}, at: [<ffffffff81565def>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#13){.+.+.+}, at: [<ffffffff81565def>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff8152f5b3>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff8152f5b3>] do_last fs/namei.c:3312 [inline]
 #1:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff8152f5b3>] path_openat+0xf13/0x2790 fs/namei.c:3534

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.124+ #32
 ffff8801d9497d08 ffffffff81af4529 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff81096740 ffff8801d9497d40
 ffffffff81aff287 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81af4529>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81af4529>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81aff287>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81aff21a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff81096844>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff813145ad>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff813145ad>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff813145ad>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff813145ad>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff811410dd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff8278bc1c>] 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: 21181 Comm: syz-executor5 Not tainted 4.9.124+ #32
task: ffff8801d6d72f80 task.stack: ffff8801b12f8000
RIP: 0010:[<ffffffff8130c83d>] 
c [<ffffffff8130c83d>] get_current arch/x86/include/asm/current.h:14 [inline]
RIP: 0010:[<ffffffff8130c83d>] 
c [<ffffffff8130c83d>] __sanitizer_cov_trace_pc+0xd/0x50 kernel/kcov.c:99
RSP: 0018:ffff8801b12ff490  EFLAGS: 00000246
RAX: ffff8801d6d72f80 RBX: ffff8801d1d86db0 RCX: 00000000000052bd
RDX: 1ffff1003adae693 RSI: 0000000000000000 RDI: ffff8801d6d73498
RBP: ffff8801b12ff490 R08: ffff8801d6d73830 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffed003a3b0dbc
R13: dffffc0000000000 R14: ffffffff83fe9ae0 R15: ffff8801d1d86de0
FS:  00007fd8db057700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f678ffe7140 CR3: 00000001c2b2a000 CR4: 00000000001606b0
DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 0000000020000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffff8801b12ff570
c ffffffff8183107e
c ffff8801b12ff558
c 1ffff1003625fe99
c
 fffffbfff07fd35c
c ffff8801d1d86e80
c ffff8801b12ff4e8
c 0000000041b58ab3
c
 ffffffff82c29369
c ffffffff81830ee0
c ffff8801b12ff528
c ffffffff00000000
c
Call Trace:
 [<ffffffff8183107e>] request_wait_answer+0x19e/0x6f0 fs/fuse/dev.c:459
 [<ffffffff818353e9>] __fuse_request_send+0x109/0x1b0 fs/fuse/dev.c:480
 [<ffffffff818354ed>] fuse_request_send+0x5d/0x70 fs/fuse/dev.c:493
 [<ffffffff8183bed4>] fuse_simple_request+0x2f4/0x660 fs/fuse/dev.c:551
 [<ffffffff81844273>] fuse_lookup_name+0x253/0x5d0 fs/fuse/dir.c:369
 [<ffffffff818446dd>] fuse_lookup+0xed/0x3a0 fs/fuse/dir.c:406
 [<ffffffff81844b4f>] fuse_atomic_open+0x1bf/0x2d0 fs/fuse/dir.c:545
 [<ffffffff8152a91c>] atomic_open fs/namei.c:3055 [inline]
 [<ffffffff8152a91c>] lookup_open+0xe3c/0x18b0 fs/namei.c:3194
 [<ffffffff8152f5dd>] do_last fs/namei.c:3315 [inline]
 [<ffffffff8152f5dd>] path_openat+0xf3d/0x2790 fs/namei.c:3534
 [<ffffffff81533cb7>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff814f898d>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff814f8ce7>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff814f8ce7>] SyS_open fs/open.c:1085 [inline]
 [<ffffffff814f8ce7>] SYSC_creat fs/open.c:1110 [inline]
 [<ffffffff814f8ce7>] SyS_creat+0x27/0x30 fs/open.c:1108
 [<ffffffff8100554f>] do_syscall_64+0x19f/0x480 arch/x86/entry/common.c:282
 [<ffffffff8278ba53>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c