======================================
| [ 1252.206682][T13384] rcu_scheduler_active = 2, debug_locks = 1
| [ 1252.206908][T13384] no locks held by smcrouted/13384.
| [ 1252.207069][T13384]
| [ 1252.207069][T13384] stack backtrace:
[ 1252.207508][T13384] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1252.207709][T13384] Call Trace:
[ 1252.207834][T13384]  <TASK>
[1252.207925][T13384] dump_stack_lvl (lib/dump_stack.c:123) 
[1252.208095][T13384] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6846) 
[1252.208261][T13384] ip6mr_get_table (net/ipv6/ip6mr.c:132 (discriminator 11)) 
[1252.208427][T13384] ip6_mroute_setsockopt (net/ipv6/ip6mr.c:1670) 
[1252.208592][T13384] ? __pfx_ip6_mroute_setsockopt (net/ipv6/ip6mr.c:1658) 
[1252.208790][T13384] ? __lock_release (kernel/locking/lockdep.c:5525) 
[1252.208945][T13384] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[1252.209104][T13384] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[1252.209264][T13384] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[1252.209423][T13384] ? lock_acquire (kernel/locking/lockdep.c:5822) 
[1252.209578][T13384] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[1252.209737][T13384] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[1252.209904][T13384] do_ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:415) 
[1252.210067][T13384] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872) 
[1252.210228][T13384] ? __pfx_do_ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:395) 
[1252.210394][T13384] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[1252.210551][T13384] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[1252.210706][T13384] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) 
[1252.210830][T13384] ? __lock_acquire (kernel/locking/lockdep.c:5226) 
[1252.210996][T13384] ? find_held_lock (kernel/locking/lockdep.c:5339) 
[1252.211156][T13384] ? __lock_release (kernel/locking/lockdep.c:5525) 
[1252.211311][T13384] ? __create_object (mm/kmemleak.c:766) 
[1252.211470][T13384] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) 
[1252.211630][T13384] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[1252.211786][T13384] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[1252.211946][T13384] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) 
[1252.212073][T13384] ? ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:996) 
[1252.212231][T13384] ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:996) 
[1252.212391][T13384] rawv6_setsockopt (net/ipv6/raw.c:1054) 
[1252.212551][T13384] ? __pfx_rawv6_setsockopt (net/ipv6/raw.c:1039) 
[1252.212706][T13384] ? find_held_lock (kernel/locking/lockdep.c:5339) 
[1252.212864][T13384] ? kfree (mm/slub.c:4716) 
[1252.212983][T13384] ? __lock_release (kernel/locking/lockdep.c:5525) 
[1252.213145][T13384] ? fd_install (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 fs/file.c:654) 
[1252.213309][T13384] do_sock_setsockopt (net/socket.c:2313) 
[1252.213475][T13384] ? __pfx_do_sock_setsockopt (net/socket.c:2282) 
[1252.213656][T13384] __sys_setsockopt (net/socket.c:2338) 
[1252.213819][T13384] __x64_sys_setsockopt (net/socket.c:2341) 
[1252.213974][T13384] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[1252.214171][T13384] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[1252.214332][T13384] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 1252.214529][T13384] RIP: 0033:0x7f7fac7b791e
[ 1252.214698][T13384] Code: 0f 1f 40 00 48 8b 15 e1 94 0a 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b1 0f 1f 00 f3 0f 1e fa 49 89 ca b8 36 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 0a c3 66 0f 1f 84 00 00 00 00 00 48 8b 15 a9
All code
========
   0:	0f 1f 40 00          	nopl   0x0(%rax)
   4:	48 8b 15 e1 94 0a 00 	mov    0xa94e1(%rip),%rdx        # 0xa94ec
   b:	f7 d8                	neg    %eax
   d:	64 89 02             	mov    %eax,%fs:(%rdx)
  10:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
  17:	eb b1                	jmp    0xffffffffffffffca
  19:	0f 1f 00             	nopl   (%rax)
  1c:	f3 0f 1e fa          	endbr64
  20:	49 89 ca             	mov    %rcx,%r10
  23:	b8 36 00 00 00       	mov    $0x36,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 0a                	ja     0x3c
  32:	c3                   	ret
  33:	66 0f 1f 84 00 00 00 	nopw   0x0(%rax,%rax,1)
  3a:	00 00 
  3c:	48                   	rex.W
  3d:	8b                   	.byte 0x8b
  3e:	15                   	.byte 0x15
  3f:	a9                   	.byte 0xa9

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 0a                	ja     0x12
   8:	c3                   	ret
   9:	66 0f 1f 84 00 00 00 	nopw   0x0(%rax,%rax,1)
  10:	00 00 
  12:	48                   	rex.W
  13:	8b                   	.byte 0x8b
  14:	15                   	.byte 0x15
  15:	a9                   	.byte 0xa9
[ 1252.215241][T13384] RSP: 002b:00007ffc4e52fa48 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
[ 1252.215480][T13384] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7fac7b791e
[ 1252.215713][T13384] RDX: 00000000000000c8 RSI: 0000000000000029 RDI: 0000000000000008
[ 1252.215945][T13384] RBP: 0000000000000008 R08: 0000000000000004 R09: 0000000000000000
[ 1252.216183][T13384] R10: 00007ffc4e52fa6c R11: 0000000000000246 R12: 0000000000000000


Finger prints:
lockdep_rcu_suspicious:ip6mr_get_table:ip6_mroute_setsockopt:do_ipv6_setsockopt:ipv6_setsockopt