======================================
| [ 3052.672732][T19936] br0: port 2(vx0) entered forwarding state
| [ 3059.296404][T17389] br0: port 1(swp1) entered disabled state
| [ 3068.785706][T20022] general protection fault, probably for non-canonical address 0xdffffc0000001fc0: 0000 [#1] PREEMPT SMP KASAN NOPTI
| [ 3068.786037][T20022] KASAN: probably user-memory-access in range [0x000000000000fe00-0x000000000000fe07]
[ 3068.786465][T20022] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[3068.786746][T20022] RIP: 0010:nh_valid_get_del_req (./include/net/netlink.h:1680 net/ipv4/nexthop.c:3235) 
[ 3068.786918][T20022] Code: ea 03 80 3c 02 00 0f 85 7a 02 00 00 48 8b 5e 70 48 85 db 74 6b 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 04 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 51
All code
========
   0:	ea                   	(bad)
   1:	03 80 3c 02 00 0f    	add    0xf00023c(%rax),%eax
   7:	85 7a 02             	test   %edi,0x2(%rdx)
   a:	00 00                	add    %al,(%rax)
   c:	48 8b 5e 70          	mov    0x70(%rsi),%rbx
  10:	48 85 db             	test   %rbx,%rbx
  13:	74 6b                	je     0x80
  15:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1c:	fc ff df 
  1f:	48 8d 7b 04          	lea    0x4(%rbx),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
  2a:*	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx		<-- trapping instruction
  2e:	48 89 f8             	mov    %rdi,%rax
  31:	83 e0 07             	and    $0x7,%eax
  34:	83 c0 03             	add    $0x3,%eax
  37:	38 d0                	cmp    %dl,%al
  39:	7c 08                	jl     0x43
  3b:	84 d2                	test   %dl,%dl
  3d:	0f                   	.byte 0xf
  3e:	85                   	.byte 0x85
  3f:	51                   	push   %rcx

Code starting with the faulting instruction
===========================================
   0:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
   4:	48 89 f8             	mov    %rdi,%rax
   7:	83 e0 07             	and    $0x7,%eax
   a:	83 c0 03             	add    $0x3,%eax
   d:	38 d0                	cmp    %dl,%al
   f:	7c 08                	jl     0x19
  11:	84 d2                	test   %dl,%dl
  13:	0f                   	.byte 0xf
  14:	85                   	.byte 0x85
  15:	51                   	push   %rcx
[ 3068.787370][T20022] RSP: 0018:ffffc9000114f4f8 EFLAGS: 00010206
[ 3068.787536][T20022] RAX: dffffc0000000000 RBX: 000000000000fdfd RCX: ffffc9000114f560
[ 3068.787725][T20022] RDX: 0000000000001fc0 RSI: ffffc9000114f5c0 RDI: 000000000000fe01
[ 3068.787912][T20022] RBP: ffff88801147bac0 R08: ffffc9000114f840 R09: 0000000000000004
[ 3068.788100][T20022] R10: dffffc0000000000 R11: 0000000000000001 R12: ffffc9000114f570
[ 3068.788284][T20022] R13: 0000000000000000 R14: ffffc9000114f840 R15: ffffc9000114f5c0
[ 3068.788468][T20022] FS:  00007ff09a388c40(0000) GS:ffff888036080000(0000) knlGS:0000000000000000
[ 3068.788691][T20022] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 3068.788846][T20022] CR2: 00007ff09a5e1423 CR3: 000000001194e003 CR4: 0000000000770ef0
[ 3068.789035][T20022] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 3068.789228][T20022] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 3068.789412][T20022] PKRU: 55555554
[ 3068.789510][T20022] Call Trace:
[ 3068.789612][T20022]  <TASK>
[3068.789677][T20022] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) 
[3068.789776][T20022] ? exc_general_protection (arch/x86/kernel/traps.c:701 arch/x86/kernel/traps.c:643) 
[3068.789907][T20022] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:564) 
[3068.790037][T20022] ? nh_valid_get_del_req (./include/net/netlink.h:1680 net/ipv4/nexthop.c:3235) 
[3068.790162][T20022] ? __nla_parse (lib/nlattr.c:732) 
[3068.790290][T20022] rtm_del_nexthop (net/ipv4/nexthop.c:3264) 
[3068.790418][T20022] ? __pfx_rtm_del_nexthop (net/ipv4/nexthop.c:3245) 
[3068.790546][T20022] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[3068.790672][T20022] ? rtnetlink_rcv_msg (net/core/rtnetlink.c:6593) 
[3068.790798][T20022] ? __mutex_lock (./arch/x86/include/asm/preempt.h:94 kernel/locking/mutex.c:618 kernel/locking/mutex.c:752) 
[3068.790924][T20022] ? rtnetlink_rcv_msg (net/core/rtnetlink.c:6593) 
[3068.791047][T20022] ? __pfx___mutex_lock (kernel/locking/mutex.c:751) 
[3068.791171][T20022] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[3068.791297][T20022] rtnetlink_rcv_msg (net/core/rtnetlink.c:6595) 
[3068.791420][T20022] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6489) 
[3068.791547][T20022] ? 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:228) 
[3068.791671][T20022] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[3068.791766][T20022] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[3068.791893][T20022] netlink_rcv_skb (net/netlink/af_netlink.c:2559) 
[3068.792019][T20022] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6489) 
[3068.792153][T20022] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2536) 
[3068.792350][T20022] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[3068.792476][T20022] ? __pfx___netlink_lookup (net/netlink/af_netlink.c:512) 
[3068.792605][T20022] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[3068.792738][T20022] ? netlink_deliver_tap (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:783 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333) 
[3068.792998][T20022] ? netlink_deliver_tap (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:783 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333) 
[3068.793121][T20022] ? netlink_deliver_tap (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:783 net/netlink/af_netlink.c:340) 
[3068.793246][T20022] netlink_unicast (net/netlink/af_netlink.c:1335 net/netlink/af_netlink.c:1361) 
[3068.793378][T20022] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1346) 
[3068.793571][T20022] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[3068.793700][T20022] netlink_sendmsg (net/netlink/af_netlink.c:1905) 
[3068.793827][T20022] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1824) 
[3068.793952][T20022] ? __might_fault (mm/memory.c:6080 mm/memory.c:6073) 
[3068.794076][T20022] ? __import_iovec (lib/iov_iter.c:1261 lib/iov_iter.c:1277) 
[3068.794204][T20022] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2584) 
[3068.794331][T20022] ? __pfx_____sys_sendmsg (net/socket.c:2530) 
[3068.794454][T20022] ? __pfx_copy_msghdr_from_user (net/socket.c:2510) 
[3068.794674][T20022] ? __lock_release (kernel/locking/lockdep.c:5430) 
[3068.794794][T20022] ? do_fault_around (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:783 mm/memory.c:4719) 
[3068.794924][T20022] ___sys_sendmsg (net/socket.c:2640) 
[3068.795045][T20022] ? __pte_offset_map (./include/linux/rcupdate.h:751 mm/pgtable-generic.c:285) 
[3068.795171][T20022] ? __pfx____sys_sendmsg (net/socket.c:2627) 
[3068.795305][T20022] ? 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:228) 
[3068.795433][T20022] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[3068.795523][T20022] ? __pfx_filemap_map_pages (mm/filemap.c:3521) 
[3068.795647][T20022] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[3068.795774][T20022] ? usage_skip (kernel/locking/lockdep.c:2295 kernel/locking/lockdep.c:2263) 
[3068.795896][T20022] ? do_user_addr_fault (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 ./include/linux/mm.h:686 arch/x86/mm/fault.c:1357) 
[3068.796025][T20022] ? reacquire_held_locks (kernel/locking/lockdep.c:5279) 
[3068.796146][T20022] ? do_user_addr_fault (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 ./include/linux/mm.h:686 arch/x86/mm/fault.c:1357) 
[3068.796346][T20022] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[3068.796474][T20022] __sys_sendmsg (./include/linux/file.h:32 net/socket.c:2669) 
[3068.796611][T20022] ? __pfx___sys_sendmsg (net/socket.c:2655) 
[3068.796737][T20022] ? __up_read (./arch/x86/include/asm/atomic64_64.h:79 ./include/linux/atomic/atomic-arch-fallback.h:2735 ./include/linux/atomic/atomic-long.h:184 ./include/linux/atomic/atomic-instrumented.h:3289 kernel/locking/rwsem.c:1347) 
[3068.796926][T20022] ? do_user_addr_fault (./include/linux/rcupdate.h:784 ./include/linux/mm.h:688 arch/x86/mm/fault.c:1357) 
[3068.797056][T20022] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[3068.797181][T20022] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[ 3068.797334][T20022] RIP: 0033:0x7ff09a5917b7
[ 3068.797530][T20022] 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)
[ 3068.797978][T20022] RSP: 002b:00007ffee857e2c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 3068.798232][T20022] RAX: ffffffffffffffda RBX: 00007ffee857ee20 RCX: 00007ff09a5917b7
[ 3068.798420][T20022] RDX: 0000000000000000 RSI: 00007ffee857e330 RDI: 0000000000000005
[ 3068.798673][T20022] RBP: 00007ffee857e7f0 R08: 0000000000000004 R09: 0000000000000000
[ 3068.798867][T20022] R10: 00007ff09a44a708 R11: 0000000000000246 R12: 00007ffee8580a1a


Finger prints:
nh_valid_get_del_req:rtm_del_nexthop:rtnetlink_rcv_msg:netlink_rcv_skb