ip6_tunnel: ip6tnl1 xmit: Local address not yet configured!
ip6_tunnel: ip6tnl3 xmit: Local address not yet configured!
INFO: task syz-executor.3:17797 blocked for more than 140 seconds.
      Not tainted 4.9.155+ #27
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3  D25768 17797      1 0x00000004
 ffff880188c05f00 ffff8801c95a1080 ffff8801db621000 ffff8801a82c0000
 ffff8801db621018 ffff8801aad67598 ffffffff82806806 38ae9712eef777e1
 0000000000000001 ffff880188c067b0 0000000000000006 ffff8801db6218f0
Call Trace:
 [<ffffffff82807d92>] schedule+0x92/0x1c0 kernel/sched/core.c:3553
 [<ffffffff82808733>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff8280a68d>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff8280a68d>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621
 [<ffffffff818928ad>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364
 [<ffffffff81873bb9>] fuse_lookup+0x89/0x3b0 fs/fuse/dir.c:406
 [<ffffffff8152c99b>] lookup_slow+0x24b/0x480 fs/namei.c:1709
 [<ffffffff8153bc0e>] walk_component+0x71e/0xce0 fs/namei.c:1825
 [<ffffffff8153ca67>] link_path_walk+0x897/0x1200 fs/namei.c:2161
 [<ffffffff8153d977>] path_mountpoint+0x67/0x6d0 fs/namei.c:2737
 [<ffffffff8154238f>] filename_mountpoint+0x17f/0x350 fs/namei.c:2758
 [<ffffffff81543a8a>] user_path_mountpoint_at+0x3a/0x50 fs/namei.c:2788
 [<ffffffff81579bd6>] SYSC_umount fs/namespace.c:1722 [inline]
 [<ffffffff81579bd6>] SyS_umount+0x136/0xd30 fs/namespace.c:1706
 [<ffffffff810056bd>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285
 [<ffffffff82816a93>] 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: [<ffffffff8131bbab>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131bbab>] watchdog+0x11b/0xa40 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.?..}, at: [<ffffffff813fea8f>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336
2 locks held by getty/2019:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff82814b83>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff81d3982e>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
1 lock held by syz-executor.2/10733:
 #0:  (&sig->cred_guard_mutex){+.+.+.}, at: [<ffffffff81522f75>] prepare_bprm_creds+0x55/0x120 fs/exec.c:1369
1 lock held by syz-executor.2/10745:
 #0:  (&sig->cred_guard_mutex){+.+.+.}, at: [<ffffffff81522f75>] prepare_bprm_creds+0x55/0x120 fs/exec.c:1369
1 lock held by syz-executor.0/10027:
 #0:  (&sig->cred_guard_mutex){+.+.+.}, at: [<ffffffff81522f75>] prepare_bprm_creds+0x55/0x120 fs/exec.c:1369
2 locks held by syz-executor.3/17797:
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152c8b0>] inode_lock_shared include/linux/fs.h:778 [inline]
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152c8b0>] lookup_slow+0x160/0x480 fs/namei.c:1686
 #1:  (&fi->mutex){+.+.+.}, at: [<ffffffff818928ad>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364
2 locks held by syz-executor.3/23737:
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152c8b0>] inode_lock_shared include/linux/fs.h:778 [inline]
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152c8b0>] lookup_slow+0x160/0x480 fs/namei.c:1686
 #1:  (&fi->mutex){+.+.+.}, at: [<ffffffff818928ad>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.155+ #27
 ffff8801d9907cd0 ffffffff81b47871 0000000000000001 0000000000000000
 0000000000000001 ffffffff81097301 00000000003ffd7b ffff8801d9907d08
 ffffffff81b52afc 0000000000000001 0000000000000000 0000000000000001
Call Trace:
 [<ffffffff81b47871>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b47871>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<ffffffff81b52afc>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81b52a84>] 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
 [<ffffffff8131c087>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8131c087>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8131c087>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8131c087>] watchdog+0x5f7/0xa40 kernel/hung_task.c:239
 [<ffffffff81142028>] kthread+0x278/0x310 kernel/kthread.c:211
 [<ffffffff82816c5c>] 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: 1889 Comm: rs:main Q:Reg Not tainted 4.9.155+ #27
task: ffff8801d3cb2f80 task.stack: ffff8801d3aa0000
RIP: 0010:[<ffffffff81207de1>] 
c [<ffffffff81207de1>] iterate_chain_key kernel/locking/lockdep.c:317 [inline]
RIP: 0010:[<ffffffff81207de1>] 
c [<ffffffff81207de1>] __lock_acquire+0x761/0x4350 kernel/locking/lockdep.c:3340
RSP: 0018:ffff8801d3aa7660  EFLAGS: 00000096
RAX: 0000000000000000 RBX: 0000000000000700 RCX: 00000000ffffffe4
RDX: 000000000000001c RSI: ffff8801d3cb3830 RDI: 0000000000000000
RBP: ffff8801d3aa77e8 R08: 0000000000000001 R09: ffff8801d3cb3850
R10: ffff8801d3cb3830 R11: 0000000000000001 R12: 0000000000000000
R13: 000000000000001c R14: 0000000000000000 R15: ffff8801d3cb2f80
FS:  00007fb070bb8700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fce4c669000 CR3: 00000001d5cec000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffffffff81243811
c ffff8801d3aa7720
c 0000000000000046
c c59a1e8a19bd54d8
c
 0000000000000046
c ffff8801d3cb2f80
c 0000000000000000
c ffff8801d3aa76d8
c
 ffffffff81babb7c
c ffffffff81babb7c
c 000060fe2460e908
c ffffffff830bdc80
c
Call Trace:
 [<ffffffff8120c493>] lock_acquire+0x133/0x3d0 kernel/locking/lockdep.c:3756
 [<ffffffff811661fd>] finish_lock_switch kernel/sched/sched.h:1212 [inline]
 [<ffffffff811661fd>] finish_task_switch+0x1dd/0x660 kernel/sched/core.c:2821
 [<ffffffff8280680e>] context_switch kernel/sched/core.c:2954 [inline]
 [<ffffffff8280680e>] __schedule+0x65e/0x1b50 kernel/sched/core.c:3498
 [<ffffffff82807d92>] schedule+0x92/0x1c0 kernel/sched/core.c:3553
 [<ffffffff8129963c>] freezable_schedule include/linux/freezer.h:171 [inline]
 [<ffffffff8129963c>] futex_wait_queue_me+0x2ec/0x5a0 kernel/futex.c:2372
 [<ffffffff8129c3d8>] futex_wait+0x208/0x5d0 kernel/futex.c:2487
 [<ffffffff812a05b9>] do_futex+0x159/0x1a70 kernel/futex.c:3270
 [<ffffffff812a2123>] SYSC_futex kernel/futex.c:3330 [inline]
 [<ffffffff812a2123>] SyS_futex+0x253/0x360 kernel/futex.c:3298
 [<ffffffff810056bd>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285
 [<ffffffff82816a93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c44 
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cc1 
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c06 
c48 
c8b 
cbc 
c24 
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c00 
c00 
c00 
c<31> 
ccb 
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c41 
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cdc 
c01 
cd3 
cc1 
cc0 
c08 
c44 
c31 
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c29 
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c41 
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c41 
c