======================================
| [ 1332.302954][ T8900] rcu_scheduler_active = 2, debug_locks = 1
| [ 1332.303216][ T8900] no locks held by smcrouted/8900.
| [ 1332.304163][ T8900]
| [ 1332.304163][ T8900] stack backtrace:
[ 1332.304694][ T8900] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1332.304918][ T8900] Call Trace:
[ 1332.305053][ T8900]  <TASK>
[ 1332.305149][ T8900] dump_stack_lvl (lib/dump_stack.c:123) 
[ 1332.305336][ T8900] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) 
[ 1332.305515][ T8900] ip6mr_get_table (net/ipv6/ip6mr.c:132 (discriminator 11)) 
[ 1332.305691][ T8900] ip6_mroute_setsockopt (net/ipv6/ip6mr.c:1670) 
[ 1332.305865][ T8900] ? __pfx_ip6_mroute_setsockopt (net/ipv6/ip6mr.c:1658) 
[ 1332.306081][ T8900] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 1332.306254][ T8900] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[ 1332.306430][ T8900] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 1332.306611][ T8900] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[ 1332.306785][ T8900] ? lock_acquire (kernel/locking/lockdep.c:5798) 
[ 1332.306959][ T8900] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[ 1332.307134][ T8900] ? __might_fault (mm/memory.c:6716 mm/memory.c:6709) 
[ 1332.307311][ T8900] do_ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:415) 
[ 1332.307486][ T8900] ? __lock_release (kernel/locking/lockdep.c:5486) 
[ 1332.307672][ T8900] ? __pfx_do_ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:395) 
[ 1332.307845][ T8900] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 1332.308027][ T8900] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 1332.308196][ T8900] ? validate_chain (kernel/locking/lockdep.c:3797 kernel/locking/lockdep.c:3817 kernel/locking/lockdep.c:3872) 
[ 1332.308370][ T8900] ? is_bpf_text_address (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 kernel/bpf/core.c:769) 
[ 1332.308549][ T8900] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[ 1332.308721][ T8900] ? 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) 
[ 1332.308897][ T8900] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 1332.309038][ T8900] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 1332.309229][ T8900] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 1332.309414][ T8900] ? ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:996) 
[ 1332.309589][ T8900] ipv6_setsockopt (net/ipv6/ipv6_sockglue.c:996) 
[ 1332.309765][ T8900] rawv6_setsockopt (net/ipv6/raw.c:1054) 
[ 1332.309936][ T8900] ? __pfx_rawv6_setsockopt (net/ipv6/raw.c:1039) 
[ 1332.310106][ T8900] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 1332.310287][ T8900] ? kfree (mm/slub.c:4716) 
[ 1332.310430][ T8900] do_sock_setsockopt (net/socket.c:2336) 
[ 1332.310612][ T8900] ? __pfx_do_sock_setsockopt (net/socket.c:2305) 
[ 1332.310788][ T8900] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 1332.310963][ T8900] ? fd_install (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 fs/file.c:612) 
[ 1332.311144][ T8900] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 1332.311323][ T8900] ? fdget (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1114 fs/file.c:1128) 
[ 1332.311464][ T8900] __sys_setsockopt (./include/linux/file.h:35 net/socket.c:2361) 
[ 1332.311639][ T8900] ? __pfx___sys_setsockopt (net/socket.c:2349) 
[ 1332.311815][ T8900] ? __sys_socket (net/socket.c:496 net/socket.c:1727) 
[ 1332.311992][ T8900] ? __pfx___sys_socket (net/socket.c:1714) 
[ 1332.312169][ T8900] ? do_user_addr_fault (./include/linux/mmap_lock.h:172 arch/x86/mm/fault.c:1417) 
[ 1332.312343][ T8900] __x64_sys_setsockopt (net/socket.c:2365) 
[ 1332.312519][ T8900] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 1332.312731][ T8900] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 1332.312907][ T8900] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 1332.313118][ T8900] RIP: 0033:0x7f3e8e4b391e
[ 1332.313309][ T8900] 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
[ 1332.313908][ T8900] RSP: 002b:00007ffca481bfd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
[ 1332.314172][ T8900] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f3e8e4b391e
[ 1332.314441][ T8900] RDX: 00000000000000c8 RSI: 0000000000000029 RDI: 0000000000000008
[ 1332.314701][ T8900] RBP: 0000000000000008 R08: 0000000000000004 R09: 0000000000000000
[ 1332.314960][ T8900] R10: 00007ffca481bffc R11: 0000000000000246 R12: 0000000000000000


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