ip6_tunnel: ip6tnl3 xmit: Local address not yet configured!
ip6_tunnel: ip6tnl4 xmit: Local address not yet configured!
INFO: task kworker/u4:36:27854 blocked for more than 140 seconds.
      Not tainted 4.9.169+ #43
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:36   D25832 27854      2 0x80000000
Workqueue: netns cleanup_net
 ffff8801a4fe8000 0000000000000000 ffff8801db721000 ffff8801a30e4740
 ffff8801db721018 ffff8801c82d79a8 ffffffff8280152e 000000000002bd10
 1ffff1003905af2c 0000000000000000 ffff8801db7218f0 1ffff1003905af24
Call Trace:
 [<0000000011a0d033>] schedule+0x92/0x1c0 kernel/sched/core.c:3546
 [<0000000062f080b0>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579
 [<000000004c9db9b5>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<000000004c9db9b5>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621
 [<00000000cf6c492d>] cleanup_net+0x131/0x8a0 net/core/net_namespace.c:440
 [<000000003176b912>] process_one_work+0x88b/0x1600 kernel/workqueue.c:2114
 [<00000000995d7d3f>] worker_thread+0x5df/0x11d0 kernel/workqueue.c:2251
 [<000000004ce87862>] kthread+0x278/0x310 kernel/kthread.c:211
 [<000000002e7d1304>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373

Showing all locks held in the system:
2 locks held by khungtaskd/24:
 #0:  (rcu_read_lock){......}, at: [<0000000034ea4f73>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<0000000034ea4f73>] watchdog+0x13c/0xae0 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<0000000081afe1f6>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339
2 locks held by getty/2024:
 #0:  (&tty->ldisc_sem){++++++}, at: [<000000008001215a>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<000000008a649493>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
3 locks held by kworker/u4:36/27854:
 #0:  ("%s""netns"){.+.+.+}, at: [<00000000b528ed64>] process_one_work+0x790/0x1600 kernel/workqueue.c:2107
 #1:  (net_cleanup_work){+.+.+.}, at: [<00000000841c052a>] process_one_work+0x7ce/0x1600 kernel/workqueue.c:2111
 #2:  (net_mutex){+.+.+.}, at: [<00000000cf6c492d>] cleanup_net+0x131/0x8a0 net/core/net_namespace.c:440

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.169+ #43
 ffff8801d98d7cc8 ffffffff81b4f7f1 0000000000000001 0000000000000000
 0000000000000001 ffffffff81097401 dffffc0000000000 ffff8801d98d7d00
 ffffffff81b5aa8c 0000000000000001 0000000000000000 0000000000000001
Call Trace:
 [<000000007dcfc25d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<000000007dcfc25d>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<0000000041ca0cf1>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99
 [<00000000dcaf2542>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60
 [<00000000e8be4f57>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<000000000b40c58c>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<000000000b40c58c>] check_hung_task kernel/hung_task.c:125 [inline]
 [<000000000b40c58c>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<000000000b40c58c>] watchdog+0x661/0xae0 kernel/hung_task.c:239
 [<000000004ce87862>] kthread+0x278/0x310 kernel/kthread.c:211
 [<000000002e7d1304>] 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: 31086 Comm: syz-executor.2 Not tainted 4.9.169+ #43
task: 0000000092b6aa8b task.stack: 00000000612af5e8
RIP: 0010:[<ffffffff8121597a>] 
c [<0000000093ae255f>] do_raw_spin_lock+0xa/0x1e0 kernel/locking/spinlock_debug.c:111
RSP: 0000:ffff8801c61bfa98  EFLAGS: 00000082
RAX: dffffc0000000000 RBX: ffffffff842c9840 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8801c0a208d8 RDI: ffffffff842c9848
RBP: ffff8801c61bfab8 R08: 0000000000000001 R09: 000000000000749f
R10: ffff8801c0a208d8 R11: 0000000000000001 R12: ffffffff842c9848
R13: 0000000000000086 R14: ffffffff842c9848 R15: 0000000000000046
FS:  00007f6dad971700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000027dbfc01c65 CR3: 00000001c8a31000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffffffff82810ef8
c ffffffff81bb8929
c dffffc0000000000
c ffffffff81102a65
c
 ffff8801c61bfba8
c ffffffff81bb8929
c ffffffff811ffe30
c ffff8801c61bfae0
c
 ffff88015fd9b000
c ffff88015fd9a420
c ffff8801c61bfb28
c ffffffff81bb5e7c
c
Call Trace:
 [<000000009b8d376d>] __debug_check_no_obj_freed lib/debugobjects.c:711 [inline]
 [<000000009b8d376d>] debug_check_no_obj_freed+0x159/0x6d0 lib/debugobjects.c:749
 [<000000001f477e51>] slab_free_hook mm/slub.c:1348 [inline]
 [<000000001f477e51>] slab_free_freelist_hook mm/slub.c:1377 [inline]
 [<000000001f477e51>] slab_free mm/slub.c:2958 [inline]
 [<000000001f477e51>] kmem_cache_free+0x1a4/0x310 mm/slub.c:2980
 [<00000000f7ee5bbc>] __sigqueue_free.part.0+0x55/0x60 kernel/signal.c:403
 [<0000000020d7d71d>] __sigqueue_free kernel/signal.c:399 [inline]
 [<0000000020d7d71d>] dequeue_synchronous_signal kernel/signal.c:737 [inline]
 [<0000000020d7d71d>] get_signal+0x956/0x1aa0 kernel/signal.c:2270
 [<00000000daf5faa5>] do_signal+0x9c/0x1920 arch/x86/kernel/signal.c:807
 [<00000000fce74b45>] exit_to_usermode_loop+0x11c/0x160 arch/x86/entry/common.c:158
 [<000000009df33989>] prepare_exit_to_usermode+0x143/0x1b0 arch/x86/entry/common.c:194
 [<000000008b1debdb>] retint_user+0x8/0x3c
Code: 
c48 
c89 
c75 
ce8 
c4c 
c89 
c4d 
cf0 
ce8 
cc4 
c33 
c2e 
c00 
c48 
c8b 
c75 
ce8 
c4c 
c8b 
c4d 
cf0 
ceb 
cb3 
c66 
c2e 
c0f 
c1f 
c84 
c00 
c00 
c00 
c00 
c00 
c48 
cb8 
c00 
c00 
c00 
c00 
c00 
cfc 
cff 
cdf 
c<55> 
c48 
c89 
ce5 
c41 
c56 
c41 
c55 
c41 
c54 
c49 
c89 
cfc 
c48 
c83 
cc7 
c04 
c48 
c89 
cfa 
c53 
c