======================================
| [  881.200353][ T4524] 1 lock held by ip/4524:
| [ 881.200571][ T4524] #0: ffff88800b86d030 (&tb->tb6_lock){+...}-{3:3}, at: ip6_route_multipath_add (net/ipv6/route.c:1351 net/ipv6/route.c:5477) 
| [  881.201122][ T4524]
| [  881.201122][ T4524] stack backtrace:
[  881.201475][ T4524] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  881.201477][ T4524] Call Trace:
[  881.201480][ T4524]  <TASK>
[ 881.201483][ T4524] dump_stack_lvl (lib/dump_stack.c:123) 
[ 881.201492][ T4524] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6866) 
[ 881.201504][ T4524] 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) 
[ 881.201513][ T4524] fib6_add_rt2node (net/ipv6/ip6_fib.c:1225 (discriminator 2)) 
[ 881.201516][ T4524] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 881.201523][ T4524] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 881.201538][ T4524] ? __pfx_fib6_add_rt2node (net/ipv6/ip6_fib.c:1093) 
[ 881.201541][ T4524] ? fib6_add_1.constprop.0 (net/ipv6/ip6_fib.c:771) 
[ 881.201554][ T4524] fib6_add (net/ipv6/ip6_fib.c:1531) 
[ 881.201561][ T4524] ? 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) 
[ 881.201565][ T4524] ? __pfx_fib6_add (net/ipv6/ip6_fib.c:1423) 
[ 881.201568][ T4524] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 881.201572][ T4524] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 881.201575][ T4524] ? ip6_route_multipath_add (net/ipv6/route.c:1351 net/ipv6/route.c:5477) 
[ 881.201584][ T4524] ip6_route_multipath_add (./include/linux/spinlock.h:396 net/ipv6/route.c:1352 net/ipv6/route.c:5477) 
[ 881.201598][ T4524] ? __pfx_ip6_route_multipath_add (net/ipv6/route.c:5389) 
[ 881.201628][ T4524] ? __pfx_inet6_rtm_newroute (net/ipv6/route.c:5631) 
[ 881.201632][ T4524] ? __pfx_inet6_rtm_newroute (net/ipv6/route.c:5631) 
[ 881.201637][ T4524] inet6_rtm_newroute (net/ipv6/route.c:5631) 
[ 881.201642][ T4524] ? __pfx_inet6_rtm_newroute (net/ipv6/route.c:5631) 
[ 881.201660][ T4524] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/rtnetlink.c:6953) 
[ 881.201665][ T4524] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 881.201672][ T4524] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/rtnetlink.c:6953) 
[ 881.201676][ T4524] rtnetlink_rcv_msg (net/core/rtnetlink.c:6955) 
[ 881.201682][ T4524] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6858) 
[ 881.201685][ T4524] ? validate_chain (kernel/locking/lockdep.c:3802 kernel/locking/lockdep.c:3822 kernel/locking/lockdep.c:3877) 
[ 881.201701][ T4524] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 881.201707][ T4524] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6858) 
[ 881.201713][ T4524] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 881.201717][ T4524] ? __lock_acquire (kernel/locking/lockdep.c:5235) 
[ 881.201731][ T4524] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/netlink/af_netlink.c:340) 
[ 881.201734][ T4524] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 881.201740][ T4524] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/netlink/af_netlink.c:340) 
[ 881.201744][ T4524] ? 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) 
[ 881.201751][ T4524] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 881.201759][ T4524] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 881.201764][ T4524] ? __lock_acquire (kernel/locking/lockdep.c:5235) 
[ 881.201774][ T4524] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 881.201783][ T4524] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 881.201789][ T4524] ? __import_iovec (lib/iov_iter.c:1444 lib/iov_iter.c:1459) 
[ 881.201801][ T4524] ____sys_sendmsg (net/socket.c:712 net/socket.c:727 net/socket.c:2566) 
[ 881.201809][ T4524] ? __pfx_____sys_sendmsg (net/socket.c:2512) 
[ 881.201812][ T4524] ? __pfx_copy_msghdr_from_user (net/socket.c:2492) 
[ 881.201828][ T4524] ___sys_sendmsg (net/socket.c:2622) 
[ 881.201834][ T4524] ? __pfx____sys_sendmsg (net/socket.c:2609) 
[ 881.201839][ T4524] ? __pfx_handle_pte_fault (mm/memory.c:5954) 
[ 881.201846][ T4524] ? reacquire_held_locks (kernel/locking/lockdep.c:5383) 
[ 881.201849][ T4524] ? do_user_addr_fault (arch/x86/mm/fault.c:1328) 
[ 881.201860][ T4524] ? __handle_mm_fault (mm/memory.c:6140) 
[ 881.201864][ T4524] ? __pfx___handle_mm_fault (mm/memory.c:6049) 
[ 881.201867][ T4524] ? __lock_release (kernel/locking/lockdep.c:5580) 
[ 881.201883][ T4524] ? __pfx_lock_vma_under_rcu (mm/memory.c:6547) 
[ 881.201890][ T4524] __sys_sendmsg (net/socket.c:2652) 
[ 881.201894][ T4524] ? __pfx___sys_sendmsg (net/socket.c:2637) 
[ 881.201899][ T4524] ? 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) 
[ 881.201908][ T4524] ? 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) 
[ 881.201914][ T4524] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 881.201924][ T4524] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 881.201931][ T4524] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  881.201936][ T4524] RIP: 0033:0x7fe7e8d6d9a7
[ 881.201941][ T4524] 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)
[  881.201944][ T4524] RSP: 002b:00007ffd8e433158 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  881.201948][ T4524] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fe7e8d6d9a7
[  881.201950][ T4524] RDX: 0000000000000000 RSI: 00007ffd8e4331c0 RDI: 0000000000000005
[  881.201952][ T4524] RBP: 00007ffd8e43350c R08: 0000000000000038 R09: 00007ffd8e4331b6
[  881.201954][ T4524] R10: 00007ffd8e437991 R11: 0000000000000246 R12: 00007ffd8e4344d0


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