======================================
| [ 1697.944306][T15140] 1 lock held by ip/15140:
| [1697.944615][T15140] #0: ffff888001db8830 (&tb->tb6_lock){+.-.}-{3:3}, at: ip6_route_multipath_add (net/ipv6/route.c:1351 net/ipv6/route.c:5477) 
| [ 1697.945216][T15140]
| [ 1697.945216][T15140] stack backtrace:
[ 1697.945593][T15140] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1697.945595][T15140] Call Trace:
[ 1697.945598][T15140]  <TASK>
[1697.945600][T15140] dump_stack_lvl (lib/dump_stack.c:123) 
[1697.945608][T15140] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6866) 
[1697.945619][T15140] 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) 
[1697.945628][T15140] fib6_add_rt2node (net/ipv6/ip6_fib.c:1225 (discriminator 2)) 
[1697.945631][T15140] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[1697.945635][T15140] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[1697.945649][T15140] ? __pfx_fib6_add_rt2node (net/ipv6/ip6_fib.c:1093) 
[1697.945653][T15140] ? fib6_add_1.constprop.0 (net/ipv6/ip6_fib.c:771) 
[1697.945665][T15140] fib6_add (net/ipv6/ip6_fib.c:1531) 
[1697.945672][T15140] ? 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) 
[1697.945676][T15140] ? __pfx_fib6_add (net/ipv6/ip6_fib.c:1423) 
[1697.945679][T15140] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[1697.945683][T15140] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[1697.945686][T15140] ? ip6_route_multipath_add (net/ipv6/route.c:1351 net/ipv6/route.c:5477) 
[1697.945695][T15140] ip6_route_multipath_add (./include/linux/spinlock.h:396 net/ipv6/route.c:1352 net/ipv6/route.c:5477) 
[1697.945709][T15140] ? __pfx_ip6_route_multipath_add (net/ipv6/route.c:5389) 
[1697.945739][T15140] ? __pfx_inet6_rtm_newroute (net/ipv6/route.c:5631) 
[1697.945743][T15140] ? __pfx_inet6_rtm_newroute (net/ipv6/route.c:5631) 
[1697.945748][T15140] inet6_rtm_newroute (net/ipv6/route.c:5631) 
[1697.945753][T15140] ? __pfx_inet6_rtm_newroute (net/ipv6/route.c:5631) 
[1697.945771][T15140] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/rtnetlink.c:6953) 
[1697.945775][T15140] ? __lock_release (kernel/locking/lockdep.c:5534) 
[1697.945781][T15140] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/rtnetlink.c:6953) 
[1697.945786][T15140] rtnetlink_rcv_msg (net/core/rtnetlink.c:6955) 
[1697.945792][T15140] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6858) 
[1697.945794][T15140] ? validate_chain (kernel/locking/lockdep.c:3802 kernel/locking/lockdep.c:3822 kernel/locking/lockdep.c:3877) 
[1697.945810][T15140] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[1697.945815][T15140] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6858) 
[1697.945821][T15140] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[1697.945825][T15140] ? __lock_acquire (kernel/locking/lockdep.c:5235) 
[1697.945838][T15140] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/netlink/af_netlink.c:340) 
[1697.945841][T15140] ? __lock_release (kernel/locking/lockdep.c:5534) 
[1697.945848][T15140] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/netlink/af_netlink.c:340) 
[1697.945851][T15140] ? 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) 
[1697.945858][T15140] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[1697.945866][T15140] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[1697.945870][T15140] ? __lock_acquire (kernel/locking/lockdep.c:5235) 
[1697.945880][T15140] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[1697.945888][T15140] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[1697.945895][T15140] ? __import_iovec (lib/iov_iter.c:1444 lib/iov_iter.c:1459) 
[1697.945906][T15140] ____sys_sendmsg (net/socket.c:712 net/socket.c:727 net/socket.c:2566) 
[1697.945913][T15140] ? __pfx_____sys_sendmsg (net/socket.c:2512) 
[1697.945916][T15140] ? __pfx_copy_msghdr_from_user (net/socket.c:2492) 
[1697.945931][T15140] ___sys_sendmsg (net/socket.c:2622) 
[1697.945938][T15140] ? __pfx____sys_sendmsg (net/socket.c:2609) 
[1697.945942][T15140] ? __pfx_handle_pte_fault (mm/memory.c:5954) 
[1697.945948][T15140] ? reacquire_held_locks (kernel/locking/lockdep.c:5383) 
[1697.945951][T15140] ? do_user_addr_fault (arch/x86/mm/fault.c:1328) 
[1697.945960][T15140] ? __handle_mm_fault (mm/memory.c:6140) 
[1697.945964][T15140] ? __pfx___handle_mm_fault (mm/memory.c:6049) 
[1697.945967][T15140] ? __lock_release (kernel/locking/lockdep.c:5580) 
[1697.945982][T15140] ? __pfx_lock_vma_under_rcu (mm/memory.c:6547) 
[1697.945990][T15140] __sys_sendmsg (net/socket.c:2652) 
[1697.945994][T15140] ? __pfx___sys_sendmsg (net/socket.c:2637) 
[1697.945998][T15140] ? 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) 
[1697.946007][T15140] ? 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) 
[1697.946014][T15140] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[1697.946022][T15140] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[1697.946028][T15140] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 1697.946032][T15140] RIP: 0033:0x7f154c7579a7
[ 1697.946037][T15140] 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)
[ 1697.946039][T15140] RSP: 002b:00007ffdb1429ea8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 1697.946043][T15140] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f154c7579a7
[ 1697.946045][T15140] RDX: 0000000000000000 RSI: 00007ffdb1429f10 RDI: 0000000000000005
[ 1697.946047][T15140] RBP: 00007ffdb142a25c R08: 0000000000000038 R09: 00007ffdb1429f06
[ 1697.946049][T15140] R10: 00007ffdb142d991 R11: 0000000000000246 R12: 00007ffdb142b220


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