ip6_tunnel: ip6tnl1 xmit: Local address not yet configured!
ip6_tunnel: ip6tnl1 xmit: Local address not yet configured!
ip6_tunnel: ip6tnl1 xmit: Local address not yet configured!
ip6_tunnel: ip6tnl1 xmit: Local address not yet configured!
INFO: task syz-executor.4:6545 blocked for more than 140 seconds.
      Not tainted 4.9.165+ #28
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D25592  6545      1 0x00000004
 ffff8801a498c740 ffff8801d0821b80 ffff8801db721000 ffff8801d1d7af80
 ffff8801db721018 ffff8801abbdf598 ffffffff827fbd7e ffff8801abbdf4d8
 ffffffff81bafffc 00ff8801abbdf5d0 ffff8801db7218f0 1ffff1003577bea2
Call Trace:
 [<ffffffff827fd652>] schedule+0x92/0x1c0 kernel/sched/core.c:3546
 [<ffffffff827fdff3>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579
 [<ffffffff827fff4d>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff827fff4d>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621
 [<ffffffff81896abd>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364
 [<ffffffff81877d69>] fuse_lookup+0x89/0x3b0 fs/fuse/dir.c:406
 [<ffffffff815301eb>] lookup_slow+0x24b/0x480 fs/namei.c:1709
 [<ffffffff8153f45e>] walk_component+0x71e/0xce0 fs/namei.c:1825
 [<ffffffff815402b7>] link_path_walk+0x897/0x1200 fs/namei.c:2161
 [<ffffffff815411c7>] path_mountpoint+0x67/0x6d0 fs/namei.c:2737
 [<ffffffff81545bdf>] filename_mountpoint+0x17f/0x350 fs/namei.c:2758
 [<ffffffff815472da>] user_path_mountpoint_at+0x3a/0x50 fs/namei.c:2788
 [<ffffffff8157d426>] SYSC_umount fs/namespace.c:1722 [inline]
 [<ffffffff8157d426>] SyS_umount+0x136/0xd30 fs/namespace.c:1706
 [<ffffffff810056bd>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285
 [<ffffffff8280c213>] 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: [<ffffffff8131d3fc>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131d3fc>] watchdog+0x13c/0xae0 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.?..}, at: [<ffffffff8140072f>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/1898:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff81572b48>] __fdget_pos+0xa8/0xd0 fs/file.c:781
2 locks held by getty/2026:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff8280a2e3>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81d3daee>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.4/6545:
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff81530100>] inode_lock_shared include/linux/fs.h:778 [inline]
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff81530100>] lookup_slow+0x160/0x480 fs/namei.c:1686
 #1:  (&fi->mutex){+.+.+.}, at: [<ffffffff81896abd>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364
1 lock held by syz-executor.4/15244:
 #0:  (&sig->cred_guard_mutex){+.+.+.}, at: [<ffffffff81526765>] prepare_bprm_creds+0x55/0x120 fs/exec.c:1369
1 lock held by syz-executor.4/15269:
 #0:  (&sig->cred_guard_mutex){+.+.+.}, at: [<ffffffff81526765>] prepare_bprm_creds+0x55/0x120 fs/exec.c:1369
2 locks held by syz-executor.4/15948:
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff81530100>] inode_lock_shared include/linux/fs.h:778 [inline]
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff81530100>] lookup_slow+0x160/0x480 fs/namei.c:1686
 #1:  (&fi->mutex){+.+.+.}, at: [<ffffffff81896abd>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364

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

NMI backtrace for cpu 0
CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.165+ #28
 ffff8801d98d7cc8 ffffffff81b4baf1 0000000000000000 0000000000000000
 0000000000000000 ffffffff81097401 dffffc0000000000 ffff8801d98d7d00
 ffffffff81b56d7c 0000000000000000 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff81b4baf1>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b4baf1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<ffffffff81b56d7c>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81b56d04>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60
 [<ffffffff81097594>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8131d921>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8131d921>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8131d921>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8131d921>] watchdog+0x661/0xae0 kernel/hung_task.c:239
 [<ffffffff81142298>] kthread+0x278/0x310 kernel/kthread.c:211
 [<ffffffff8280c3dc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 1898 Comm: rsyslogd Not tainted 4.9.165+ #28
task: ffff8801d4308000 task.stack: ffff8801d39c0000
RIP: 0010:[<ffffffff81166957>] 
c [<ffffffff81166957>] preempt_count_sub+0x67/0x170 kernel/sched/core.c:3275
RSP: 0018:ffff8801d39c78e8  EFLAGS: 00000097
RAX: 0000000080000004 RBX: 00000000ffffffff RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffffffff81bafe1c RDI: 0000000000000001
RBP: ffff8801d39c78f0 R08: 0000000000000000 R09: ffff8801db721108
R10: 0000000000003c00 R11: 0000008588771c0c R12: 0000000000000001
R13: ffff8801db7210a0 R14: ffff8801d4138080 R15: ffff8801d4138278
FS:  00007f424acfc700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8eb151e000 CR3: 00000001ca7a1000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 0000000000000002
c ffff8801d39c7918
c ffffffff8124c9a2
c ffffffff81247da5
c
 ffffffff831fb0e0
c ffff8801db7210a0
c ffff8801d39c7930
c ffffffff81244387
c
 dffffc0000000000
c ffff8801d39c7a60
c ffffffff811aa8aa
c 0000000041b58ab3
c
Call Trace:
 [<ffffffff8124c9a2>] rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1109 [inline]
 [<ffffffff8124c9a2>] rcu_lockdep_current_cpu_online+0xf2/0x140 kernel/rcu/tree.c:1096
 [<ffffffff81244387>] rcu_read_lock_sched_held+0x97/0x130 kernel/rcu/update.c:109
 [<ffffffff811aa8aa>] trace_sched_load_avg_task include/trace/events/sched.h:626 [inline]
 [<ffffffff811aa8aa>] update_load_avg kernel/sched/fair.c:3345 [inline]
 [<ffffffff811aa8aa>] enqueue_entity kernel/sched/fair.c:3647 [inline]
 [<ffffffff811aa8aa>] enqueue_task_fair+0x4c4a/0xa0d0 kernel/sched/fair.c:4839
 [<ffffffff8116fd2a>] enqueue_task kernel/sched/core.c:763 [inline]
 [<ffffffff8116fd2a>] activate_task+0x15a/0x290 kernel/sched/core.c:781
 [<ffffffff81170e43>] ttwu_activate kernel/sched/core.c:1693 [inline]
 [<ffffffff81170e43>] ttwu_do_activate+0xd3/0x200 kernel/sched/core.c:1752
 [<ffffffff811742e3>] ttwu_queue kernel/sched/core.c:1908 [inline]
 [<ffffffff811742e3>] try_to_wake_up+0x5a3/0x1030 kernel/sched/core.c:2122
 [<ffffffff81174e25>] wake_up_process kernel/sched/core.c:2197 [inline]
 [<ffffffff81174e25>] wake_up_q+0x95/0xf0 kernel/sched/core.c:470
 [<ffffffff812a21a3>] futex_wake_op kernel/futex.c:1596 [inline]
 [<ffffffff812a21a3>] do_futex+0x12d3/0x1a70 kernel/futex.c:3283
 [<ffffffff812a2b93>] SYSC_futex kernel/futex.c:3333 [inline]
 [<ffffffff812a2b93>] SyS_futex+0x253/0x360 kernel/futex.c:3301
 [<ffffffff810056bd>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285
 [<ffffffff8280c213>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
cc9 
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cff 
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c14 
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c65 
c01 
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c<5b> 
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c91 
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ca1 
c00 
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cf4 
c48 
cc7 
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c24 
c84 
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cba 
c