======================================
| [ 1941.123459][T17261] 1 lock held by ip/17261:
| [1941.123736][T17261] #0: ffff88800dbfd030 (&tb->tb6_lock){+...}-{3:3}, at: ip6_route_multipath_add (net/ipv6/route.c:1351 net/ipv6/route.c:5477) 
| [ 1941.124340][T17261]
| [ 1941.124340][T17261] stack backtrace:
[ 1941.124707][T17261] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1941.124709][T17261] Call Trace:
[ 1941.124712][T17261]  <TASK>
[1941.124714][T17261] dump_stack_lvl (lib/dump_stack.c:123) 
[1941.124729][T17261] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6866) 
[1941.124741][T17261] 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) 
[1941.124752][T17261] fib6_add_rt2node (net/ipv6/ip6_fib.c:1225 (discriminator 2)) 
[1941.124756][T17261] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[1941.124762][T17261] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[1941.124778][T17261] ? __pfx_fib6_add_rt2node (net/ipv6/ip6_fib.c:1093) 
[1941.124781][T17261] ? fib6_add_1.constprop.0 (net/ipv6/ip6_fib.c:771) 
[1941.124794][T17261] fib6_add (net/ipv6/ip6_fib.c:1531) 
[1941.124803][T17261] ? 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) 
[1941.124809][T17261] ? __pfx_fib6_add (net/ipv6/ip6_fib.c:1423) 
[1941.124811][T17261] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[1941.124816][T17261] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[1941.124819][T17261] ? ip6_route_multipath_add (net/ipv6/route.c:1351 net/ipv6/route.c:5477) 
[1941.124828][T17261] ip6_route_multipath_add (./include/linux/spinlock.h:396 net/ipv6/route.c:1352 net/ipv6/route.c:5477) 
[1941.124843][T17261] ? __pfx_ip6_route_multipath_add (net/ipv6/route.c:5389) 
[1941.124873][T17261] ? __pfx_inet6_rtm_newroute (net/ipv6/route.c:5631) 
[1941.124876][T17261] ? __pfx_inet6_rtm_newroute (net/ipv6/route.c:5631) 
[1941.124882][T17261] inet6_rtm_newroute (net/ipv6/route.c:5631) 
[1941.124887][T17261] ? __pfx_inet6_rtm_newroute (net/ipv6/route.c:5631) 
[1941.124905][T17261] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/rtnetlink.c:6953) 
[1941.124912][T17261] ? __lock_release (kernel/locking/lockdep.c:5534) 
[1941.124918][T17261] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/rtnetlink.c:6953) 
[1941.124923][T17261] rtnetlink_rcv_msg (net/core/rtnetlink.c:6955) 
[1941.124930][T17261] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6858) 
[1941.124932][T17261] ? validate_chain (kernel/locking/lockdep.c:3802 kernel/locking/lockdep.c:3822 kernel/locking/lockdep.c:3877) 
[1941.124948][T17261] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[1941.124958][T17261] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6858) 
[1941.124964][T17261] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[1941.124969][T17261] ? __lock_acquire (kernel/locking/lockdep.c:5235) 
[1941.124982][T17261] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/netlink/af_netlink.c:340) 
[1941.124985][T17261] ? __lock_release (kernel/locking/lockdep.c:5534) 
[1941.124991][T17261] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/netlink/af_netlink.c:340) 
[1941.124995][T17261] ? 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) 
[1941.125002][T17261] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[1941.125010][T17261] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[1941.125014][T17261] ? __lock_acquire (kernel/locking/lockdep.c:5235) 
[1941.125025][T17261] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[1941.125033][T17261] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[1941.125040][T17261] ? __import_iovec (lib/iov_iter.c:1444 lib/iov_iter.c:1459) 
[1941.125054][T17261] ____sys_sendmsg (net/socket.c:712 net/socket.c:727 net/socket.c:2566) 
[1941.125062][T17261] ? __pfx_____sys_sendmsg (net/socket.c:2512) 
[1941.125065][T17261] ? __pfx_copy_msghdr_from_user (net/socket.c:2492) 
[1941.125081][T17261] ___sys_sendmsg (net/socket.c:2622) 
[1941.125084][T17261] ? kasan_record_aux_stack (mm/kasan/generic.c:548) 
[1941.125092][T17261] ? __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:127 kernel/rcu/tree.c:3084) 
[1941.125100][T17261] ? __pfx____sys_sendmsg (net/socket.c:2609) 
[1941.125109][T17261] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[1941.125119][T17261] ? __lock_acquire (kernel/locking/lockdep.c:5235) 
[1941.125129][T17261] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[1941.125135][T17261] ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:953 ./include/linux/mmzone.h:2127 arch/x86/mm/physaddr.c:65) 
[1941.125142][T17261] ? __lock_release (kernel/locking/lockdep.c:5534) 
[1941.125155][T17261] __sys_sendmsg (net/socket.c:2652) 
[1941.125159][T17261] ? __pfx___sys_sendmsg (net/socket.c:2637) 
[1941.125176][T17261] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[1941.125184][T17261] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[1941.125192][T17261] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 1941.125197][T17261] RIP: 0033:0x7f88e19259a7
[ 1941.125202][T17261] 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)
[ 1941.125206][T17261] RSP: 002b:00007ffd725e8a88 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 1941.125211][T17261] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f88e19259a7
[ 1941.125214][T17261] RDX: 0000000000000000 RSI: 00007ffd725e8af0 RDI: 0000000000000005
[ 1941.125217][T17261] RBP: 00007ffd725e8e3c R08: 0000000000000038 R09: 0000000000000000
[ 1941.125220][T17261] R10: 000000000f087910 R11: 0000000000000246 R12: 00007ffd725e9e00


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