======================================
| xx__-> [   96.025083][   T67] ------------[ cut here ]------------
| [   96.025509][   T67] RTNL: assertion failed at net/core/link_watch.c (59)
| [ 96.025764][ T67] WARNING: CPU: 2 PID: 67 at net/core/link_watch.c:59 default_operstate (net/core/link_watch.c:59 (discriminator 3))
| [   96.026072][   T67] Modules linked in: unix_diag vxlan
[   96.026591][   T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   96.026918][   T67] Workqueue: netns cleanup_net
[ 96.027112][ T67] RIP: 0010:default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 96.027300][ T67] Code: 83 e4 01 0f 85 03 ff ff ff c6 05 08 23 5c 02 01 90 ba 3b 00 00 00 48 c7 c6 00 7c 57 9e 48 c7 c7 40 7c 57 9e e8 b3 b2 e5 fd 90 <0f> 0b 90 90 e9 d9 fe ff ff 48 89 ef e8 81 63 6d fe e9 f7 fd ff ff
All code
========
   0:	83 e4 01             	and    $0x1,%esp
   3:	0f 85 03 ff ff ff    	jne    0xffffffffffffff0c
   9:	c6 05 08 23 5c 02 01 	movb   $0x1,0x25c2308(%rip)        # 0x25c2318
  10:	90                   	nop
  11:	ba 3b 00 00 00       	mov    $0x3b,%edx
  16:	48 c7 c6 00 7c 57 9e 	mov    $0xffffffff9e577c00,%rsi
  1d:	48 c7 c7 40 7c 57 9e 	mov    $0xffffffff9e577c40,%rdi
  24:	e8 b3 b2 e5 fd       	call   0xfffffffffde5b2dc
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	e9 d9 fe ff ff       	jmp    0xffffffffffffff0c
  33:	48 89 ef             	mov    %rbp,%rdi
  36:	e8 81 63 6d fe       	call   0xfffffffffe6d63bc
  3b:	e9 f7 fd ff ff       	jmp    0xfffffffffffffe37

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	e9 d9 fe ff ff       	jmp    0xfffffffffffffee2
   9:	48 89 ef             	mov    %rbp,%rdi
   c:	e8 81 63 6d fe       	call   0xfffffffffe6d6392
  11:	e9 f7 fd ff ff       	jmp    0xfffffffffffffe0d
[   96.027911][   T67] RSP: 0000:ffffc90000487a48 EFLAGS: 00010282
[   96.028141][   T67] RAX: 0000000000000000 RBX: ffff88800ac81000 RCX: 1ffffffff3dbdd8c
[   96.028414][   T67] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
[   96.028682][   T67] RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff3dbdd8c
[   96.028949][   T67] R10: 0000000000000003 R11: ffff8880091b8040 R12: 0000000000000000
[   96.029206][   T67] R13: dffffc0000000000 R14: ffff888008821000 R15: ffff88800ac815c0
[   96.029482][   T67] FS:  0000000000000000(0000) GS:ffff88806d100000(0000) knlGS:0000000000000000
[   96.029785][   T67] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   96.030015][   T67] CR2: 00007f06f6f63155 CR3: 000000003633a003 CR4: 0000000000772ef0
[   96.030277][   T67] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   96.030551][   T67] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   96.030817][   T67] PKRU: 55555554
[   96.030960][   T67] Call Trace:
[   96.031103][   T67]  <TASK>
[ 96.031218][ T67] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 96.031419][ T67] ? __warn (kernel/panic.c:748)
[ 96.031566][ T67] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 96.031749][ T67] ? report_bug (lib/bug.c:201 lib/bug.c:219)
[ 96.031937][ T67] ? handle_bug (arch/x86/kernel/traps.c:285)
[ 96.032080][ T67] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1))
[ 96.032263][ T67] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)
[ 96.032465][ T67] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 96.032648][ T67] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 96.032831][ T67] rfc2863_policy (net/core/link_watch.c:78)
[ 96.033015][ T67] linkwatch_do_dev (net/core/link_watch.c:180)
[ 96.033218][ T67] netdev_run_todo (net/core/dev.c:10894 (discriminator 2))
[ 96.033419][ T67] ? __pfx_netdev_run_todo (net/core/dev.c:10867)
[ 96.033605][ T67] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11455)
[ 96.033833][ T67] default_device_exit_batch (net/core/dev.c:12051)
[ 96.034016][ T67] ? __pfx_default_device_exit_batch (net/core/dev.c:12051)
[ 96.034251][ T67] ? ops_exit_list (net/core/net_namespace.c:171 (discriminator 3))
[ 96.034451][ T67] cleanup_net (net/core/net_namespace.c:647 (discriminator 3))
[ 96.034631][ T67] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 96.034819][ T67] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 96.035012][ T67] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 96.035201][ T67] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 96.035392][ T67] ? process_one_work (kernel/workqueue.c:3205)
[ 96.035593][ T67] process_one_work (kernel/workqueue.c:3229)
[ 96.035787][ T67] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 96.035968][ T67] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 96.036160][ T67] ? assign_work (kernel/workqueue.c:1200)
[ 96.036372][ T67] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 96.036564][ T67] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 96.036803][ T67] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 96.036985][ T67] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 96.037173][ T67] kthread (kernel/kthread.c:389)
[ 96.037328][ T67] ? __pfx_kthread (kernel/kthread.c:342)
[ 96.037520][ T67] ret_from_fork (arch/x86/kernel/process.c:147)
[ 96.037707][ T67] ? __pfx_kthread (kernel/kthread.c:342)
[ 96.037916][ T67] ret_from_fork_asm (arch/x86/entry/entry_64.S:257)
| [  968.168493][T12849] no locks held by mausezahn/12849.
| [  968.168682][T12849]
| [  968.168682][T12849] stack backtrace:
| [  968.169263][T12849] Tainted: [W]=WARN
[  968.169403][T12849] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  968.169623][T12849] Call Trace:
[  968.169764][T12849]  <TASK>
[968.169860][T12849] dump_stack_lvl (lib/dump_stack.c:123)
[968.170071][T12849] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6846)
[968.170257][T12849] dev_get_by_index_rcu (net/core/dev.c:876 (discriminator 7))
[968.170433][T12849] ip6_create_rt_oif_rcu (net/ipv6/route.c:1223)
[968.170611][T12849] ? ip6_route_output_flags (net/ipv6/route.c:2695)
[968.170797][T12849] ip6_dst_lookup_tail.constprop.0 (net/ipv6/ip6_output.c:1160)
[968.171019][T12849] ip6_dst_lookup_flow (net/ipv6/ip6_output.c:1265)
[968.171219][T12849] ? __pfx_ip6_dst_lookup_flow (net/ipv6/ip6_output.c:1260)
[968.171401][T12849] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[968.171578][T12849] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872)
[968.171762][T12849] rawv6_sendmsg (net/ipv6/raw.c:899)
[968.171941][T12849] ? rwsem_mark_wake (kernel/locking/rwsem.c:508 (discriminator 2))
[968.172144][T12849] ? __pfx_rawv6_sendmsg (net/ipv6/raw.c:741)
[968.172327][T12849] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[968.172511][T12849] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[968.172696][T12849] ? find_held_lock (kernel/locking/lockdep.c:5339)
[968.172879][T12849] ? __lock_release (kernel/locking/lockdep.c:5525)
[968.173056][T12849] ? __might_fault (mm/memory.c:6751 mm/memory.c:6744)
[968.173241][T12849] ? __might_fault (mm/memory.c:6751 mm/memory.c:6744)
[968.173419][T12849] ? __might_fault (mm/memory.c:6751 mm/memory.c:6744)
[968.173604][T12849] ? __sys_sendto (net/socket.c:711 net/socket.c:726 net/socket.c:2208)
[968.173788][T12849] __sys_sendto (net/socket.c:711 net/socket.c:726 net/socket.c:2208)
[968.173970][T12849] ? __pfx___sys_sendto (net/socket.c:2175)
[968.174169][T12849] ? lock_acquire (kernel/locking/lockdep.c:5822)
[968.174345][T12849] ? rseq_update_cpu_node_id (kernel/rseq.c:109 (discriminator 10))
[968.174525][T12849] ? __rseq_handle_notify_resume (kernel/rseq.c:333)
[968.174743][T12849] ? do_user_addr_fault (./include/linux/mmap_lock.h:172 arch/x86/mm/fault.c:1417)
[968.174920][T12849] ? __pfx___rseq_handle_notify_resume (kernel/rseq.c:316)
[968.175143][T12849] __x64_sys_sendto (net/socket.c:2211)
[968.175320][T12849] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[968.175560][T12849] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[968.175739][T12849] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  968.175957][T12849] RIP: 0033:0x7f6823fffa4a
[ 968.176141][T12849] Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 15 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 7e c3 0f 1f 44 00 00 41 54 48 83 ec 30 44 89
All code
========
   0:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   4:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   b:	eb b8                	jmp    0xffffffffffffffc5
   d:	0f 1f 00             	nopl   (%rax)
  10:	f3 0f 1e fa          	endbr64
  14:	41 89 ca             	mov    %ecx,%r10d
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 15                	jne    0x38
  23:	b8 2c 00 00 00       	mov    $0x2c,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 7e                	ja     0xb0
  32:	c3                   	ret
  33:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  38:	41 54                	push   %r12
  3a:	48 83 ec 30          	sub    $0x30,%rsp
  3e:	44                   	rex.R
  3f:	89                   	.byte 0x89

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 7e                	ja     0x86
   8:	c3                   	ret
   9:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   e:	41 54                	push   %r12
  10:	48 83 ec 30          	sub    $0x30,%rsp
  14:	44                   	rex.R
  15:	89                   	.byte 0x89
[  968.176768][T12849] RSP: 002b:00007fff59f033d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[  968.177036][T12849] RAX: ffffffffffffffda RBX: 0000000010d34ec0 RCX: 00007f6823fffa4a
[  968.177390][T12849] RDX: 0000000000000050 RSI: 0000000010d35190 RDI: 0000000000000005
[  968.177738][T12849] RBP: 0000000010d34ec0 R08: 00007fff59f033e0 R09: 000000000000001c
[  968.178014][T12849] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000050


Finger prints:
lockdep_rcu_suspicious:dev_get_by_index_rcu:ip6_create_rt_oif_rcu:ip6_dst_lookup_flow:rawv6_sendmsg
default_operstate:rfc2863_policy:linkwatch_do_dev:netdev_run_todo:default_device_exit_batch