======================================
| [ 1256.221907][T13282] rcu_scheduler_active = 2, debug_locks = 1
| [ 1256.222158][T13282] no locks held by smcrouted/13282.
| [ 1256.222346][T13282]
| [ 1256.222346][T13282] stack backtrace:
[ 1256.222790][T13282] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1256.222986][T13282] Call Trace:
[ 1256.223107][T13282]  <TASK>
[1256.223192][T13282] dump_stack_lvl (lib/dump_stack.c:123) 
[1256.223358][T13282] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6846) 
[1256.223519][T13282] ip6mr_get_table (net/ipv6/ip6mr.c:132 (discriminator 11)) 
[1256.223696][T13282] ip6_mroute_setsockopt (net/ipv6/ip6mr.c:1670) 
[1256.223860][T13282] ? __pfx_ip6_mroute_setsockopt (net/ipv6/ip6mr.c:1658) 
[1256.224064][T13282] ? __lock_release (kernel/locking/lockdep.c:5525) 
[1256.224220][T13282] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[1256.224383][T13282] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[1256.224543][T13282] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[1256.224696][T13282] ? lock_acquire (kernel/locking/lockdep.c:5822) 
[1256.224852][T13282] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[1256.225012][T13282] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[1256.225176][T13282] do_ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:415) 
[1256.225343][T13282] ? usage_skip (kernel/locking/lockdep.c:2314 kernel/locking/lockdep.c:2282) 
[1256.225505][T13282] ? __pfx_do_ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:395) 
[1256.225666][T13282] ? __lock_acquire (kernel/locking/lockdep.c:5226) 
[1256.225843][T13282] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[1256.226003][T13282] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872) 
[1256.226166][T13282] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[1256.226326][T13282] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872) 
[1256.226483][T13282] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[1256.226639][T13282] ? 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) 
[1256.226799][T13282] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) 
[1256.226926][T13282] ? __lock_acquire (kernel/locking/lockdep.c:5226) 
[1256.227086][T13282] ? __lock_acquire (kernel/locking/lockdep.c:448 kernel/locking/lockdep.c:5214) 
[1256.227255][T13282] ? ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:996) 
[1256.227415][T13282] ? find_held_lock (kernel/locking/lockdep.c:5339) 
[1256.227575][T13282] ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:996) 
[1256.227736][T13282] rawv6_setsockopt (net/ipv6/raw.c:1054) 
[1256.227893][T13282] ? __pfx_rawv6_setsockopt (net/ipv6/raw.c:1039) 
[1256.228056][T13282] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[1256.228219][T13282] do_sock_setsockopt (net/socket.c:2313) 
[1256.228378][T13282] ? __pfx_do_sock_setsockopt (net/socket.c:2282) 
[1256.228545][T13282] ? clockevents_program_event (kernel/time/clockevents.c:334 (discriminator 3)) 
[1256.228746][T13282] __sys_setsockopt (net/socket.c:2338) 
[1256.228911][T13282] __x64_sys_setsockopt (net/socket.c:2341) 
[1256.229066][T13282] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[1256.229272][T13282] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[1256.229435][T13282] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 1256.229639][T13282] RIP: 0033:0x7fcb8774091e
[ 1256.229815][T13282] 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
[ 1256.230358][T13282] RSP: 002b:00007ffd88eeb818 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
[ 1256.230604][T13282] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcb8774091e
[ 1256.230845][T13282] RDX: 00000000000000c8 RSI: 0000000000000029 RDI: 0000000000000008
[ 1256.231083][T13282] RBP: 0000000000000008 R08: 0000000000000004 R09: 0000000000000000
[ 1256.231316][T13282] R10: 00007ffd88eeb83c R11: 0000000000000246 R12: 0000000000000000


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