======================================
| [  851.460242][ T9868] 1 lock held by ip/9868:
| [ 851.460461][ T9868] #0: ffff888004e83e30 (&tb->tb6_lock){+...}-{3:3}, at: ip6_route_multipath_add (net/ipv6/route.c:1351 net/ipv6/route.c:5477) 
| [  851.461044][ T9868]
| [  851.461044][ T9868] stack backtrace:
[  851.461386][ T9868] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  851.461389][ T9868] Call Trace:
[  851.461392][ T9868]  <TASK>
[ 851.461395][ T9868] dump_stack_lvl (lib/dump_stack.c:123) 
[ 851.461404][ T9868] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6866) 
[ 851.461416][ T9868] rt6_multipath_rebalance.part.0 (./include/net/addrconf.h:347 ./include/net/addrconf.h:345 ./include/net/addrconf.h:443 net/ipv6/route.c:4794 net/ipv6/route.c:4805 net/ipv6/route.c:4859) 
[ 851.461425][ T9868] fib6_add_rt2node (net/ipv6/ip6_fib.c:1225 (discriminator 2)) 
[ 851.461429][ T9868] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 851.461435][ T9868] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 851.461450][ T9868] ? __pfx_fib6_add_rt2node (net/ipv6/ip6_fib.c:1093) 
[ 851.461453][ T9868] ? fib6_add_1.constprop.0 (net/ipv6/ip6_fib.c:771) 
[ 851.461466][ T9868] fib6_add (net/ipv6/ip6_fib.c:1531) 
[ 851.461473][ T9868] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:107 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116) 
[ 851.461478][ T9868] ? __pfx_fib6_add (net/ipv6/ip6_fib.c:1423) 
[ 851.461480][ T9868] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 851.461485][ T9868] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 851.461488][ T9868] ? ip6_route_multipath_add (net/ipv6/route.c:1351 net/ipv6/route.c:5477) 
[ 851.461497][ T9868] ip6_route_multipath_add (./include/linux/spinlock.h:396 net/ipv6/route.c:1352 net/ipv6/route.c:5477) 
[ 851.461511][ T9868] ? __pfx_ip6_route_multipath_add (net/ipv6/route.c:5389) 
[ 851.461540][ T9868] ? __pfx_inet6_rtm_newroute (net/ipv6/route.c:5631) 
[ 851.461544][ T9868] ? __pfx_inet6_rtm_newroute (net/ipv6/route.c:5631) 
[ 851.461550][ T9868] inet6_rtm_newroute (net/ipv6/route.c:5631) 
[ 851.461554][ T9868] ? __pfx_inet6_rtm_newroute (net/ipv6/route.c:5631) 
[ 851.461573][ T9868] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/rtnetlink.c:6953) 
[ 851.461578][ T9868] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 851.461584][ T9868] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/rtnetlink.c:6953) 
[ 851.461589][ T9868] rtnetlink_rcv_msg (net/core/rtnetlink.c:6955) 
[ 851.461595][ T9868] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6858) 
[ 851.461597][ T9868] ? validate_chain (kernel/locking/lockdep.c:3802 kernel/locking/lockdep.c:3822 kernel/locking/lockdep.c:3877) 
[ 851.461613][ T9868] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 851.461619][ T9868] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6858) 
[ 851.461625][ T9868] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 851.461629][ T9868] ? __lock_acquire (kernel/locking/lockdep.c:5235) 
[ 851.461643][ T9868] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/netlink/af_netlink.c:340) 
[ 851.461646][ T9868] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 851.461652][ T9868] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/netlink/af_netlink.c:340) 
[ 851.461655][ T9868] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333) 
[ 851.461662][ T9868] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 851.461670][ T9868] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 851.461675][ T9868] ? __lock_acquire (kernel/locking/lockdep.c:5235) 
[ 851.461686][ T9868] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 851.461695][ T9868] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 851.461701][ T9868] ? __import_iovec (lib/iov_iter.c:1444 lib/iov_iter.c:1459) 
[ 851.461714][ T9868] ____sys_sendmsg (net/socket.c:712 net/socket.c:727 net/socket.c:2566) 
[ 851.461721][ T9868] ? __pfx_____sys_sendmsg (net/socket.c:2512) 
[ 851.461724][ T9868] ? __pfx_copy_msghdr_from_user (net/socket.c:2492) 
[ 851.461740][ T9868] ___sys_sendmsg (net/socket.c:2622) 
[ 851.461746][ T9868] ? __pfx____sys_sendmsg (net/socket.c:2609) 
[ 851.461751][ T9868] ? __pfx_handle_pte_fault (mm/memory.c:5954) 
[ 851.461757][ T9868] ? reacquire_held_locks (kernel/locking/lockdep.c:5383) 
[ 851.461761][ T9868] ? do_user_addr_fault (arch/x86/mm/fault.c:1328) 
[ 851.461771][ T9868] ? __handle_mm_fault (mm/memory.c:6140) 
[ 851.461776][ T9868] ? __pfx___handle_mm_fault (mm/memory.c:6049) 
[ 851.461779][ T9868] ? __lock_release (kernel/locking/lockdep.c:5580) 
[ 851.461794][ T9868] ? __pfx_lock_vma_under_rcu (mm/memory.c:6547) 
[ 851.461802][ T9868] __sys_sendmsg (net/socket.c:2652) 
[ 851.461806][ T9868] ? __pfx___sys_sendmsg (net/socket.c:2637) 
[ 851.461810][ T9868] ? exc_page_fault (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:151 arch/x86/mm/fault.c:1488 arch/x86/mm/fault.c:1538) 
[ 851.461820][ T9868] ? do_user_addr_fault (./arch/x86/include/asm/atomic.h:93 ./include/linux/atomic/atomic-arch-fallback.h:949 ./include/linux/atomic/atomic-instrumented.h:401 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/mm.h:704 ./include/linux/mm.h:799 arch/x86/mm/fault.c:1339) 
[ 851.461827][ T9868] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 851.461836][ T9868] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 851.461844][ T9868] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  851.461848][ T9868] RIP: 0033:0x7f7a04de09a7
[ 851.461853][ T9868] Code: 0a 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10
All code
========
   0:	0a 00                	or     (%rax),%al
   2:	f7 d8                	neg    %eax
   4:	64 89 02             	mov    %eax,%fs:(%rdx)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b9                	jmp    0xffffffffffffffc9
  10:	0f 1f 00             	nopl   (%rax)
  13:	f3 0f 1e fa          	endbr64
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 10                	jne    0x33
  23:	b8 2e 00 00 00       	mov    $0x2e,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 51                	ja     0x83
  32:	c3                   	ret
  33:	48 83 ec 28          	sub    $0x28,%rsp
  37:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  3b:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 51                	ja     0x59
   8:	c3                   	ret
   9:	48 83 ec 28          	sub    $0x28,%rsp
   d:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  11:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)
[  851.461857][ T9868] RSP: 002b:00007fff8040df98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  851.461860][ T9868] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f7a04de09a7
[  851.461863][ T9868] RDX: 0000000000000000 RSI: 00007fff8040e000 RDI: 0000000000000005
[  851.461865][ T9868] RBP: 00007fff8040e34c R08: 0000000000000038 R09: 00007fff8040dff6
[  851.461867][ T9868] R10: 00007fff80411991 R11: 0000000000000246 R12: 00007fff8040f310


Finger prints:
lockdep_rcu_suspicious:fib6_add_rt2node:fib6_add:ip6_route_multipath_add:inet6_rtm_newroute