======================================
| [ 1252.657675][ T4456] rcu_scheduler_active = 2, debug_locks = 1
| [ 1252.657905][ T4456] no locks held by smcrouted/4456.
| [ 1252.658062][ T4456]
| [ 1252.658062][ T4456] stack backtrace:
[ 1252.658560][ T4456] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1252.658757][ T4456] Call Trace:
[ 1252.658880][ T4456]  <TASK>
[ 1252.658966][ T4456] dump_stack_lvl (lib/dump_stack.c:123) 
[ 1252.659134][ T4456] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6846) 
[ 1252.659300][ T4456] ip6mr_get_table (net/ipv6/ip6mr.c:132 (discriminator 11)) 
[ 1252.659464][ T4456] ip6_mroute_setsockopt (net/ipv6/ip6mr.c:1670) 
[ 1252.659634][ T4456] ? __pfx_ip6_mroute_setsockopt (net/ipv6/ip6mr.c:1658) 
[ 1252.659842][ T4456] ? __lock_release (kernel/locking/lockdep.c:5525) 
[ 1252.660000][ T4456] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[ 1252.660166][ T4456] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 1252.660332][ T4456] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[ 1252.660499][ T4456] ? lock_acquire (kernel/locking/lockdep.c:5822) 
[ 1252.660658][ T4456] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[ 1252.660827][ T4456] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[ 1252.660992][ T4456] do_ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:415) 
[ 1252.661156][ T4456] ? validate_chain (kernel/locking/lockdep.c:3816 kernel/locking/lockdep.c:3872) 
[ 1252.661331][ T4456] ? __pfx_do_ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:395) 
[ 1252.661498][ T4456] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[ 1252.661667][ T4456] ? 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) 
[ 1252.661831][ T4456] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) 
[ 1252.661961][ T4456] ? __lock_acquire (kernel/locking/lockdep.c:5226) 
[ 1252.662145][ T4456] ? find_held_lock (kernel/locking/lockdep.c:5339) 
[ 1252.662315][ T4456] ? __lock_release (kernel/locking/lockdep.c:5525) 
[ 1252.662477][ T4456] ? __create_object (mm/kmemleak.c:766) 
[ 1252.662638][ T4456] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) 
[ 1252.662802][ T4456] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[ 1252.662965][ T4456] ? 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) 
[ 1252.663130][ T4456] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) 
[ 1252.663262][ T4456] ? ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:996) 
[ 1252.663426][ T4456] ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:996) 
[ 1252.663592][ T4456] rawv6_setsockopt (net/ipv6/raw.c:1054) 
[ 1252.663760][ T4456] ? __pfx_rawv6_setsockopt (net/ipv6/raw.c:1039) 
[ 1252.663918][ T4456] ? find_held_lock (kernel/locking/lockdep.c:5339) 
[ 1252.664082][ T4456] ? kfree (mm/slub.c:4716) 
[ 1252.664203][ T4456] ? __lock_release (kernel/locking/lockdep.c:5525) 
[ 1252.664363][ T4456] ? fd_install (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 fs/file.c:654) 
[ 1252.664532][ T4456] do_sock_setsockopt (net/socket.c:2313) 
[ 1252.664694][ T4456] ? __pfx_do_sock_setsockopt (net/socket.c:2282) 
[ 1252.664871][ T4456] __sys_setsockopt (net/socket.c:2338) 
[ 1252.665039][ T4456] __x64_sys_setsockopt (net/socket.c:2341) 
[ 1252.665196][ T4456] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 1252.665400][ T4456] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 1252.665575][ T4456] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 1252.665775][ T4456] RIP: 0033:0x7f3948ba591e
[ 1252.665942][ T4456] 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
[ 1252.666498][ T4456] RSP: 002b:00007fffd37b8988 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
[ 1252.666738][ T4456] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f3948ba591e
[ 1252.666971][ T4456] RDX: 00000000000000c8 RSI: 0000000000000029 RDI: 0000000000000008
[ 1252.667205][ T4456] RBP: 0000000000000008 R08: 0000000000000004 R09: 0000000000dbe010
[ 1252.667440][ T4456] R10: 00007fffd37b89ac R11: 0000000000000246 R12: 0000000000000000


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