======================================
| [ 5382.718926][T23958] rcu_scheduler_active = 2, debug_locks = 1
| [ 5382.719254][T23958] no locks held by mausezahn/23958.
| [ 5382.719423][T23958]
| [ 5382.719423][T23958] stack backtrace:
[ 5382.719908][T23958] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 5382.720106][T23958] Call Trace:
[ 5382.720233][T23958]  <TASK>
[5382.720320][T23958] dump_stack_lvl (lib/dump_stack.c:123)
[5382.720493][T23958] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6846)
[5382.720667][T23958] dev_get_by_index_rcu (net/core/dev.c:876 (discriminator 7))
[5382.720830][T23958] ip6_create_rt_oif_rcu (net/ipv6/route.c:1223)
[5382.720993][T23958] ? ip6_route_output_flags (net/ipv6/route.c:2695)
[5382.721168][T23958] ip6_dst_lookup_tail.constprop.0 (net/ipv6/ip6_output.c:1160)
[5382.721383][T23958] ip6_dst_lookup_flow (net/ipv6/ip6_output.c:1265)
[5382.721548][T23958] ? __pfx_ip6_dst_lookup_flow (net/ipv6/ip6_output.c:1260)
[5382.721724][T23958] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[5382.721894][T23958] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872)
[5382.722062][T23958] rawv6_sendmsg (net/ipv6/raw.c:899)
[5382.722235][T23958] ? rwsem_mark_wake (kernel/locking/rwsem.c:508 (discriminator 2))
[5382.722407][T23958] ? __pfx_rawv6_sendmsg (net/ipv6/raw.c:741)
[5382.722579][T23958] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[5382.722749][T23958] ? do_fault_around (mm/memory.c:5286)
[5382.722923][T23958] ? find_held_lock (kernel/locking/lockdep.c:5339)
[5382.723107][T23958] ? __lock_release (kernel/locking/lockdep.c:5525)
[5382.723279][T23958] ? __might_fault (mm/memory.c:6751 mm/memory.c:6744)
[5382.723453][T23958] ? __might_fault (mm/memory.c:6751 mm/memory.c:6744)
[5382.723625][T23958] ? __might_fault (mm/memory.c:6751 mm/memory.c:6744)
[5382.723801][T23958] ? __sys_sendto (net/socket.c:711 net/socket.c:726 net/socket.c:2208)
[5382.723967][T23958] __sys_sendto (net/socket.c:711 net/socket.c:726 net/socket.c:2208)
[5382.724133][T23958] ? __pfx___sys_sendto (net/socket.c:2175)
[5382.724332][T23958] ? __lock_release (kernel/locking/lockdep.c:5525)
[5382.724509][T23958] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[5382.724703][T23958] ? __pfx___up_read (kernel/locking/rwsem.c:1337)
[5382.724884][T23958] ? ksys_write (fs/read_write.c:731)
[5382.725059][T23958] ? __pfx_ksys_write (fs/read_write.c:721)
[5382.725231][T23958] ? do_user_addr_fault (./include/linux/mmap_lock.h:172 arch/x86/mm/fault.c:1417)
[5382.725415][T23958] __x64_sys_sendto (net/socket.c:2211)
[5382.725589][T23958] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[5382.725810][T23958] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[5382.725989][T23958] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 5382.726199][T23958] RIP: 0033:0x7f4d7fdd5a4a
[ 5382.726373][T23958] 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
[ 5382.726956][T23958] RSP: 002b:00007ffc03bf8e68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[ 5382.727216][T23958] RAX: ffffffffffffffda RBX: 000000001a711ec0 RCX: 00007f4d7fdd5a4a
[ 5382.727473][T23958] RDX: 0000000000000050 RSI: 000000001a712190 RDI: 0000000000000005
[ 5382.727724][T23958] RBP: 000000001a711ec0 R08: 00007ffc03bf8e70 R09: 000000000000001c
[ 5382.727979][T23958] 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