ip6_tunnel: ip6tnl51 xmit: Local address not yet configured!
ip6_tunnel: ip6tnl34 xmit: Local address not yet configured!
ip6_tunnel: ip6tnl42 xmit: Local address not yet configured!
ip6_tunnel: ip6tnl8 xmit: Local address not yet configured!
ip6_tunnel: ip6tnl3 xmit: Local address not yet configured!
INFO: task syz-executor4:21438 blocked for more than 140 seconds.
      Not tainted 4.9.142+ #73
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor4   D28136 21438   2124 0x00000004
 ffff8801d084df00 ffff8801d273ee00 ffff8801a1886880 ffff8801cea9c740
 ffff8801db721018 ffff8801ca3cfa40 ffffffff82808912 ffff8801ca3cfa18
 ffffffff81206e77 0000000000000000 00ff8801d084e7a8 ffff8801db7218f0
Call Trace:
 [<ffffffff82809e3f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff82813c3a>] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline]
 [<ffffffff82813c3a>] rwsem_down_write_failed+0x39a/0x730 kernel/locking/rwsem-xadd.c:555
 [<ffffffff81b75f57>] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
 [<ffffffff82812a5c>] __down_write arch/x86/include/asm/rwsem.h:125 [inline]
 [<ffffffff82812a5c>] down_write+0x5c/0xa0 kernel/locking/rwsem.c:54
 [<ffffffff81576b8c>] inode_lock include/linux/fs.h:768 [inline]
 [<ffffffff81576b8c>] lock_mount+0x8c/0x2c0 fs/namespace.c:2113
 [<ffffffff8157a0a7>] do_add_mount+0x27/0x330 fs/namespace.c:2496
 [<ffffffff8157be80>] do_new_mount fs/namespace.c:2563 [inline]
 [<ffffffff8157be80>] do_mount+0x1330/0x28a0 fs/namespace.c:2871
 [<ffffffff8157de9a>] SYSC_mount fs/namespace.c:3087 [inline]
 [<ffffffff8157de9a>] SyS_mount+0xea/0x100 fs/namespace.c:3064
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff82818bd3>] 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: [<ffffffff8131c19c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131c19c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813fe70f>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/2028:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff82816ca2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81d37f02>] n_tty_read+0x202/0x1830 drivers/tty/n_tty.c:2156
1 lock held by syz-executor4/21438:
 #0:  (&type->i_mutex_dir_key#8){++++++}, at: [<ffffffff81576b8c>] inode_lock include/linux/fs.h:768 [inline]
 #0:  (&type->i_mutex_dir_key#8){++++++}, at: [<ffffffff81576b8c>] lock_mount+0x8c/0x2c0 fs/namespace.c:2113
2 locks held by syz-executor4/21444:
 #0:  (sb_writers#13){.+.+.+}, at: [<ffffffff81575c5f>] sb_start_write include/linux/fs.h:1575 [inline]
 #0:  (sb_writers#13){.+.+.+}, at: [<ffffffff81575c5f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&type->i_mutex_dir_key#7/1){+.+.+.}, at: [<ffffffff815405da>] inode_lock_nested include/linux/fs.h:803 [inline]
 #1:  (&type->i_mutex_dir_key#7/1){+.+.+.}, at: [<ffffffff815405da>] filename_create+0x17a/0x480 fs/namei.c:3686

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.142+ #73
 ffff8801d9907d08 ffffffff81b43969 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810983b0 ffff8801d9907d40
 ffffffff81b4ea79 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81b43969>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b43969>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81b4ea79>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81b4ea0c>] nmi_trigger_cpumask_backtrace+0x12c/0x151 lib/nmi_backtrace.c:60
 [<ffffffff810984b4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8131c72d>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8131c72d>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8131c72d>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8131c72d>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff81142c3d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff82818d9c>] 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: 21429 Comm: syz-executor4 Not tainted 4.9.142+ #73
task: ffff8801d38d2f80 task.stack: ffff88012bd30000
RIP: 0010:[<ffffffff811679d2>] 
c [<ffffffff811679d2>] ___might_sleep+0x42/0x260 kernel/sched/core.c:7954
RSP: 0018:ffff88012bd37880  EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff8801d38d2f80 RCX: ffffed003a71a705
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000246
RBP: ffff88012bd378a8 R08: ffff8801d38d3830 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff82afce40 R14: 00000000000001de R15: ffff8801cae4a708
FS:  00007f81ae4f0700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000401 CR3: 00000001a41e5000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d38d2f80
c ffffffff82afce40
c 00000000000001de
c 0000000000000000
c
 ffff8801cae4a708
c ffff88012bd378e8
c ffffffff81167c85
c ffffffff81167c00
c
 ffff8801cae4a6d8
c ffff8801cae4a6d8
c ffffed00395c94e1
c dffffc0000000000
c
Call Trace:
 [<ffffffff81167c85>] __might_sleep+0x95/0x1a0 kernel/sched/core.c:7945
 [<ffffffff8185ace4>] request_wait_answer+0x124/0x820 fs/fuse/dev.c:477
 [<ffffffff8185f7f9>] __fuse_request_send+0x109/0x1b0 fs/fuse/dev.c:498
 [<ffffffff8185f8fd>] fuse_request_send+0x5d/0x70 fs/fuse/dev.c:511
 [<ffffffff81867564>] fuse_simple_request+0x2f4/0x660 fs/fuse/dev.c:569
 [<ffffffff8186fba3>] fuse_lookup_name+0x253/0x5d0 fs/fuse/dir.c:369
 [<ffffffff81870013>] fuse_lookup+0xf3/0x3b0 fs/fuse/dir.c:407
 [<ffffffff815365bc>] lookup_real fs/namei.c:1563 [inline]
 [<ffffffff815365bc>] __lookup_hash+0x11c/0x190 fs/namei.c:1583
 [<ffffffff81540606>] filename_create+0x1a6/0x480 fs/namei.c:3687
 [<ffffffff8154258b>] user_path_create fs/namei.c:3744 [inline]
 [<ffffffff8154258b>] SYSC_mkdirat fs/namei.c:3888 [inline]
 [<ffffffff8154258b>] SyS_mkdirat+0xbb/0x240 fs/namei.c:3880
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff82818bd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
c35 
cc3 
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c53 
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c27 
c02 
c00 
c0f 
c84 
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c01 
c00 
c00 
c<65> 
c8b 
c1d 
cb7 
c03 
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c7e 
c65 
c4c 
c8b 
c3c 
c25 
c00 
c7e 
c01 
c00 
c49 
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cd8 
c03 
c