======================================
| [ 1282.352262][ T4453] rcu_scheduler_active = 2, debug_locks = 1
| [ 1282.352505][ T4453] no locks held by smcrouted/4453.
| [ 1282.352666][ T4453]
| [ 1282.352666][ T4453] stack backtrace:
[ 1282.353139][ T4453] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1282.353334][ T4453] Call Trace:
[ 1282.353458][ T4453]  <TASK>
[ 1282.353547][ T4453] dump_stack_lvl (lib/dump_stack.c:123) 
[ 1282.353724][ T4453] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 1282.353892][ T4453] ip6mr_get_table (net/ipv6/ip6mr.c:132 (discriminator 11)) 
[ 1282.354072][ T4453] ip6_mroute_setsockopt (net/ipv6/ip6mr.c:1670) 
[ 1282.354233][ T4453] ? __pfx_ip6_mroute_setsockopt (net/ipv6/ip6mr.c:1658) 
[ 1282.354438][ T4453] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 1282.354596][ T4453] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[ 1282.354764][ T4453] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 1282.354928][ T4453] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[ 1282.355105][ T4453] ? lock_acquire (kernel/locking/lockdep.c:5798) 
[ 1282.355265][ T4453] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[ 1282.355425][ T4453] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[ 1282.355619][ T4453] do_ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:415) 
[ 1282.355786][ T4453] ? __lock_release (kernel/locking/lockdep.c:5477) 
[ 1282.355948][ T4453] ? __pfx_do_ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:395) 
[ 1282.356121][ T4453] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 1282.356282][ T4453] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 1282.356445][ T4453] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872) 
[ 1282.356623][ T4453] ? is_bpf_text_address (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 kernel/bpf/core.c:769) 
[ 1282.356790][ T4453] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[ 1282.356948][ T4453] ? 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) 
[ 1282.357105][ T4453] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 1282.357236][ T4453] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 1282.357403][ T4453] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 1282.357570][ T4453] ? ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:996) 
[ 1282.357744][ T4453] ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:996) 
[ 1282.357916][ T4453] rawv6_setsockopt (net/ipv6/raw.c:1054) 
[ 1282.358084][ T4453] ? __pfx_rawv6_setsockopt (net/ipv6/raw.c:1039) 
[ 1282.358246][ T4453] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 1282.358409][ T4453] ? kfree (mm/slub.c:4716) 
[ 1282.358540][ T4453] do_sock_setsockopt (net/socket.c:2336) 
[ 1282.358706][ T4453] ? __pfx_do_sock_setsockopt (net/socket.c:2305) 
[ 1282.358865][ T4453] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 1282.359021][ T4453] ? fd_install (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 fs/file.c:612) 
[ 1282.359184][ T4453] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 1282.359348][ T4453] ? fdget (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1114 fs/file.c:1128) 
[ 1282.359473][ T4453] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2361) 
[ 1282.359638][ T4453] ? __pfx___sys_setsockopt (net/socket.c:2349) 
[ 1282.359802][ T4453] ? __sys_socket (net/socket.c:496 net/socket.c:1727) 
[ 1282.359971][ T4453] ? __pfx___sys_socket (net/socket.c:1714) 
[ 1282.360155][ T4453] ? do_user_addr_fault (./include/linux/mmap_lock.h:172 arch/x86/mm/fault.c:1417) 
[ 1282.360318][ T4453] __x64_sys_setsockopt (net/socket.c:2365) 
[ 1282.360477][ T4453] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 1282.360679][ T4453] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 1282.360842][ T4453] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 1282.361043][ T4453] RIP: 0033:0x7f79fbaa891e
[ 1282.361214][ T4453] 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
[ 1282.361759][ T4453] RSP: 002b:00007ffc6b988d18 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
[ 1282.361998][ T4453] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f79fbaa891e
[ 1282.362241][ T4453] RDX: 00000000000000c8 RSI: 0000000000000029 RDI: 0000000000000008
[ 1282.362475][ T4453] RBP: 0000000000000008 R08: 0000000000000004 R09: 00000000193c4010
[ 1282.362710][ T4453] R10: 00007ffc6b988d3c R11: 0000000000000246 R12: 0000000000000000


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