======================================
| [   98.868877][   T11] ------------[ cut here ]------------
| [   98.869210][   T11] RTNL: assertion failed at net/core/link_watch.c (59)
| [ 98.869503][ T11] WARNING: CPU: 0 PID: 11 at net/core/link_watch.c:59 default_operstate (net/core/link_watch.c:59 (discriminator 3))
| [   98.869793][   T11] Modules linked in:
[   98.870228][   T11] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   98.870427][   T11] Workqueue: netns cleanup_net
[ 98.870623][ T11] RIP: 0010:default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 98.870823][ T11] 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 77 ae 48 c7 c7 40 7c 77 ae 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 77 ae 	mov    $0xffffffffae777c00,%rsi
  1d:	48 c7 c7 40 7c 77 ae 	mov    $0xffffffffae777c40,%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
[   98.872486][   T11] RSP: 0018:ffffc900000b7a48 EFLAGS: 00010282
[   98.872713][   T11] RAX: 0000000000000000 RBX: ffff8880080a9000 RCX: 1ffffffff5dfdd8c
[   98.872949][   T11] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
[   98.873202][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff5dfdd8c
[   98.873680][   T11] R10: 0000000000000003 R11: ffff888001ae2300 R12: 0000000000000000
[   98.873914][   T11] R13: dffffc0000000000 R14: ffff8880085c1000 R15: ffff8880080a95c0
[   98.874163][   T11] FS:  0000000000000000(0000) GS:ffff888066000000(0000) knlGS:0000000000000000
[   98.874440][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   98.874650][   T11] CR2: 00007f9c7d640710 CR3: 000000007153a006 CR4: 0000000000772ef0
[   98.874885][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   98.875168][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   98.875515][   T11] PKRU: 55555554
[   98.875658][   T11] Call Trace:
[   98.875804][   T11]  <TASK>
[ 98.875888][ T11] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 98.876059][ T11] ? __warn (kernel/panic.c:748)
[ 98.876183][ T11] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 98.876355][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219)
[ 98.876518][ T11] ? handle_bug (arch/x86/kernel/traps.c:285)
[ 98.876649][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1))
[ 98.876806][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)
[ 98.876973][ T11] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 98.877148][ T11] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 98.877318][ T11] rfc2863_policy (net/core/link_watch.c:78)
[ 98.877487][ T11] linkwatch_do_dev (net/core/link_watch.c:180)
[ 98.877650][ T11] netdev_run_todo (net/core/dev.c:10894 (discriminator 2))
[ 98.877812][ T11] ? __pfx_netdev_run_todo (net/core/dev.c:10867)
[ 98.877966][ T11] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11455)
[ 98.878186][ T11] default_device_exit_batch (net/core/dev.c:12051)
[ 98.878341][ T11] ? __pfx_default_device_exit_batch (net/core/dev.c:12051)
[ 98.878542][ T11] ? ops_exit_list (net/core/net_namespace.c:171 (discriminator 3))
[ 98.878718][ T11] cleanup_net (net/core/net_namespace.c:647 (discriminator 3))
[ 98.878873][ T11] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 98.879042][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 98.879202][ T11] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 98.879361][ T11] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 98.879519][ T11] ? process_one_work (kernel/workqueue.c:3205)
[ 98.879703][ T11] process_one_work (kernel/workqueue.c:3229)
[ 98.879867][ T11] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 98.880022][ T11] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 98.880223][ T11] ? assign_work (kernel/workqueue.c:1200)
[ 98.880389][ T11] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 98.880570][ T11] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 98.880734][ T11] kthread (kernel/kthread.c:389)
[ 98.880852][ T11] ? __pfx_kthread (kernel/kthread.c:342)
[ 98.881008][ T11] ret_from_fork (arch/x86/kernel/process.c:147)
[ 98.881176][ T11] ? __pfx_kthread (kernel/kthread.c:342)
[ 98.881327][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:257)
| [ 1034.225390][T11418] no locks held by mausezahn/11418.
| [ 1034.225598][T11418]
| [ 1034.225598][T11418] stack backtrace:
| [ 1034.226124][T11418] Tainted: [W]=WARN
[ 1034.226248][T11418] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1034.226448][T11418] Call Trace:
[ 1034.226572][T11418]  <TASK>
[1034.226660][T11418] dump_stack_lvl (lib/dump_stack.c:123)
[1034.226876][T11418] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6846)
[1034.227038][T11418] dev_get_by_index_rcu (net/core/dev.c:876 (discriminator 7))
[1034.227199][T11418] ip6_create_rt_oif_rcu (net/ipv6/route.c:1223)
[1034.227362][T11418] ? ip6_route_output_flags (net/ipv6/route.c:2695)
[1034.227537][T11418] ip6_dst_lookup_tail.constprop.0 (net/ipv6/ip6_output.c:1160)
[1034.227740][T11418] ip6_dst_lookup_flow (net/ipv6/ip6_output.c:1265)
[1034.227901][T11418] ? __pfx_ip6_dst_lookup_flow (net/ipv6/ip6_output.c:1260)
[1034.228063][T11418] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[1034.228236][T11418] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872)
[1034.228400][T11418] rawv6_sendmsg (net/ipv6/raw.c:899)
[1034.228565][T11418] ? rwsem_mark_wake (kernel/locking/rwsem.c:508 (discriminator 2))
[1034.228728][T11418] ? __pfx_rawv6_sendmsg (net/ipv6/raw.c:741)
[1034.228894][T11418] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[1034.229101][T11418] ? find_held_lock (kernel/locking/lockdep.c:5339)
[1034.229262][T11418] ? __lock_release (kernel/locking/lockdep.c:5525)
[1034.229420][T11418] ? __might_fault (mm/memory.c:6751 mm/memory.c:6744)
[1034.229589][T11418] ? __might_fault (mm/memory.c:6751 mm/memory.c:6744)
[1034.229748][T11418] ? __might_fault (mm/memory.c:6751 mm/memory.c:6744)
[1034.229913][T11418] ? __sys_sendto (net/socket.c:711 net/socket.c:726 net/socket.c:2208)
[1034.230075][T11418] __sys_sendto (net/socket.c:711 net/socket.c:726 net/socket.c:2208)
[1034.230290][T11418] ? __pfx___sys_sendto (net/socket.c:2175)
[1034.230458][T11418] ? __lock_release (kernel/locking/lockdep.c:5525)
[1034.230617][T11418] ? do_user_addr_fault (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/linux/mm.h:741 arch/x86/mm/fault.c:1340)
[1034.230779][T11418] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[1034.230943][T11418] ? __pfx___up_read (kernel/locking/rwsem.c:1337)
[1034.231120][T11418] ? ksys_write (fs/read_write.c:731)
[1034.231297][T11418] ? __pfx_ksys_write (fs/read_write.c:721)
[1034.231467][T11418] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:741 arch/x86/mm/fault.c:1340)
[1034.231638][T11418] __x64_sys_sendto (net/socket.c:2211)
[1034.231808][T11418] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[1034.232018][T11418] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[1034.232184][T11418] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 1034.232389][T11418] RIP: 0033:0x7f11427bba4a
[ 1034.232566][T11418] 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
[ 1034.233170][T11418] RSP: 002b:00007ffe1df46018 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[ 1034.233418][T11418] RAX: ffffffffffffffda RBX: 00000000164a0ec0 RCX: 00007f11427bba4a
[ 1034.233656][T11418] RDX: 0000000000000050 RSI: 00000000164a1190 RDI: 0000000000000005
[ 1034.233903][T11418] RBP: 00000000164a0ec0 R08: 00007ffe1df46020 R09: 000000000000001c
[ 1034.234188][T11418] 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