======================================
| [ 135.596387][ T892] #1: ffff8880056fd030 (&tb->tb6_lock){+...}-{3:3}, at: ip6_route_add (net/ipv6/route.c:1317 net/ipv6/route.c:3883) 
| [ 135.596824][ T892] #2: ffff888002150780 (&nh->lock){+...}-{3:3}, at: fib6_add (net/ipv6/ip6_fib.c:1508) 
| [  135.597207][  T892]
| [  135.597207][  T892] stack backtrace:
[  135.597515][  T892] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  135.597518][  T892] Call Trace:
[  135.597521][  T892]  <TASK>
[ 135.597524][ T892] dump_stack_lvl (lib/dump_stack.c:123) 
[ 135.597533][ T892] print_deadlock_bug (kernel/locking/lockdep.c:3042) 
[ 135.597542][ T892] validate_chain (kernel/locking/lockdep.c:3896) 
[ 135.597552][ T892] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 135.597558][ T892] ? 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:230) 
[ 135.597563][ T892] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 135.597571][ T892] __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 135.597582][ T892] lock_acquire.part.0 (kernel/locking/lockdep.c:469 kernel/locking/lockdep.c:5853) 
[ 135.597587][ T892] ? fib6_purge_rt (./include/linux/list.h:373 net/ipv6/ip6_fib.c:1053) 
[ 135.597595][ T892] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 135.597601][ T892] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 135.597608][ T892] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 135.597613][ T892] ? fib6_purge_rt (./include/linux/list.h:373 net/ipv6/ip6_fib.c:1053) 
[ 135.597621][ T892] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 135.597626][ T892] ? fib6_purge_rt (./include/linux/list.h:373 net/ipv6/ip6_fib.c:1053) 
[ 135.597631][ T892] fib6_purge_rt (./include/linux/list.h:373 net/ipv6/ip6_fib.c:1053) 
[ 135.597639][ T892] ? __pfx_fib6_purge_rt (net/ipv6/ip6_fib.c:1044) 
[ 135.597647][ T892] ? nlmsg_notify (net/netlink/af_netlink.c:2578) 
[ 135.597655][ T892] fib6_add_rt2node (net/ipv6/ip6_fib.c:1316) 
[ 135.597668][ T892] ? __pfx_fib6_add_rt2node (net/ipv6/ip6_fib.c:1092) 
[ 135.597673][ T892] ? 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) 
[ 135.597679][ T892] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 135.597684][ T892] ? fib6_add (net/ipv6/ip6_fib.c:1508) 
[ 135.597693][ T892] fib6_add (net/ipv6/ip6_fib.c:1514) 
[ 135.597701][ T892] ip6_route_add (./include/linux/spinlock.h:396 net/ipv6/route.c:1318 net/ipv6/route.c:3883) 
[ 135.597706][ T892] ? __pfx_inet6_rtm_newroute (net/ipv6/route.c:5669) 
[ 135.597711][ T892] inet6_rtm_newroute (net/ipv6/route.c:5683) 
[ 135.597716][ T892] ? __pfx_inet6_rtm_newroute (net/ipv6/route.c:5669) 
[ 135.597731][ T892] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6952) 
[ 135.597739][ T892] rtnetlink_rcv_msg (net/core/rtnetlink.c:6954) 
[ 135.597745][ T892] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 135.597750][ T892] ? 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:230) 
[ 135.597754][ T892] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 135.597763][ T892] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 135.597771][ T892] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 135.597776][ T892] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 135.597782][ T892] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 135.597796][ T892] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 135.597802][ T892] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333) 
[ 135.597808][ T892] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 135.597816][ T892] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 135.597821][ T892] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 135.597829][ T892] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 135.597837][ T892] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 135.597849][ T892] ____sys_sendmsg (net/socket.c:712 net/socket.c:727 net/socket.c:2566) 
[ 135.597858][ T892] ? __pfx_____sys_sendmsg (net/socket.c:2512) 
[ 135.597864][ T892] ? __pfx_copy_msghdr_from_user (net/socket.c:2492) 
[ 135.597877][ T892] ___sys_sendmsg (net/socket.c:2622) 
[ 135.597883][ T892] ? __pfx____sys_sendmsg (net/socket.c:2609) 
[ 135.597891][ T892] ? ___sys_recvmsg (net/socket.c:2818) 
[ 135.597897][ T892] ? __pfx____sys_recvmsg (net/socket.c:2818) 
[ 135.597904][ T892] ? do_user_addr_fault (./include/linux/rcupdate.h:337 ./include/linux/rcupdate.h:849 ./include/linux/mm.h:740 arch/x86/mm/fault.c:1339) 
[ 135.597910][ T892] ? do_user_addr_fault (./include/linux/rcupdate.h:337 ./include/linux/rcupdate.h:849 ./include/linux/mm.h:740 arch/x86/mm/fault.c:1339) 
[ 135.597918][ T892] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 135.597925][ T892] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 135.597932][ T892] __sys_sendmsg (net/socket.c:2652) 
[ 135.597938][ T892] ? __pfx___sys_sendmsg (net/socket.c:2637) 
[ 135.597947][ T892] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 135.597956][ T892] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 135.597964][ T892] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  135.597970][  T892] RIP: 0033:0x7f2c4f4e89a7
[ 135.597977][ T892] 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)
[  135.597982][  T892] RSP: 002b:00007ffd40376a88 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  135.597987][  T892] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2c4f4e89a7
[  135.597991][  T892] RDX: 0000000000000000 RSI: 00007ffd40376af0 RDI: 0000000000000005
[  135.597994][  T892] RBP: 00007ffd40379028 R08: 0000000000000004 R09: 0000000000000000
[  135.597997][  T892] R10: 00007f2c4f537ac0 R11: 0000000000000246 R12: 00007ffd40377e00


Finger prints:
print_deadlock_bug:validate_chain:__lock_acquire:_raw_spin_lock:fib6_purge_rt