======================================
| [   11.935988][  T280] rcu_scheduler_active = 2, debug_locks = 1
| [   11.936243][  T280] no locks held by smcrouted/280.
| [   11.936445][  T280]
| [   11.936445][  T280] stack backtrace:
[   11.936926][  T280] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   11.937142][  T280] Call Trace:
[   11.937263][  T280]  <TASK>
[ 11.937352][ T280] dump_stack_lvl (lib/dump_stack.c:123) 
[ 11.937515][ T280] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6846) 
[ 11.937677][ T280] ip6mr_get_table (net/ipv6/ip6mr.c:132 (discriminator 11)) 
[ 11.937844][ T280] ip6_mroute_setsockopt (net/ipv6/ip6mr.c:1670) 
[ 11.938005][ T280] ? __pfx_ip6_mroute_setsockopt (net/ipv6/ip6mr.c:1658) 
[ 11.938210][ T280] ? __lock_release (kernel/locking/lockdep.c:5525) 
[ 11.938374][ T280] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[ 11.938538][ T280] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 11.938700][ T280] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[ 11.938855][ T280] ? lock_acquire (kernel/locking/lockdep.c:5822) 
[ 11.939013][ T280] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[ 11.939175][ T280] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[ 11.939376][ T280] do_ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:415) 
[ 11.939540][ T280] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872) 
[ 11.939702][ T280] ? __pfx_do_ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:395) 
[ 11.939864][ T280] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[ 11.940020][ T280] ? 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) 
[ 11.940180][ T280] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) 
[ 11.940315][ T280] ? __lock_acquire (kernel/locking/lockdep.c:5226) 
[ 11.940483][ T280] ? find_held_lock (kernel/locking/lockdep.c:5339) 
[ 11.940642][ T280] ? __lock_release (kernel/locking/lockdep.c:5525) 
[ 11.940799][ T280] ? __create_object (mm/kmemleak.c:766) 
[ 11.940971][ T280] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) 
[ 11.941134][ T280] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[ 11.941290][ T280] ? 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) 
[ 11.941445][ T280] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) 
[ 11.941571][ T280] ? ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:996) 
[ 11.941725][ T280] ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:996) 
[ 11.941884][ T280] rawv6_setsockopt (net/ipv6/raw.c:1054) 
[ 11.942052][ T280] ? __pfx_rawv6_setsockopt (net/ipv6/raw.c:1039) 
[ 11.942209][ T280] ? find_held_lock (kernel/locking/lockdep.c:5339) 
[ 11.942365][ T280] ? kfree (mm/slub.c:4716) 
[ 11.942484][ T280] ? __lock_release (kernel/locking/lockdep.c:5525) 
[ 11.942638][ T280] ? fd_install (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 fs/file.c:654) 
[ 11.942803][ T280] do_sock_setsockopt (net/socket.c:2313) 
[ 11.942964][ T280] ? __pfx_do_sock_setsockopt (net/socket.c:2282) 
[ 11.943137][ T280] __sys_setsockopt (net/socket.c:2338) 
[ 11.943299][ T280] __x64_sys_setsockopt (net/socket.c:2341) 
[ 11.943464][ T280] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 11.943662][ T280] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 11.943824][ T280] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   11.944019][  T280] RIP: 0033:0x7feb49ced91e
[ 11.944186][ T280] 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
[   11.944734][  T280] RSP: 002b:00007ffcff166468 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
[   11.944970][  T280] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007feb49ced91e
[   11.945211][  T280] RDX: 00000000000000c8 RSI: 0000000000000029 RDI: 0000000000000008
[   11.945445][  T280] RBP: 0000000000000008 R08: 0000000000000004 R09: 0000000000000000
[   11.945687][  T280] R10: 00007ffcff16648c R11: 0000000000000246 R12: 0000000000000000


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