======================================
| [   51.253527][  T925] ==================================================================
| [ 51.253820][ T925] BUG: KASAN: null-ptr-deref in nexthop_create_group (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/linux/refcount.h:136 ./include/linux/refcount.h:142 ./include/linux/refcount.h:218 ./include/linux/refcount.h:236 ./include/net/nexthop.h:264 net/ipv4/nexthop.c:2721) 
| [   51.254072][  T925] Read of size 4 at addr 0000000000000068 by task ip/925
| [   51.254269][  T925]
[   51.254352][  T925] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   51.254355][  T925] Call Trace:
[   51.254357][  T925]  <TASK>
[ 51.254358][ T925] dump_stack_lvl (lib/dump_stack.c:123) 
[ 51.254366][ T925] kasan_report (mm/kasan/report.c:636) 
[ 51.254374][ T925] ? nexthop_create_group (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/linux/refcount.h:136 ./include/linux/refcount.h:142 ./include/linux/refcount.h:218 ./include/linux/refcount.h:236 ./include/net/nexthop.h:264 net/ipv4/nexthop.c:2721) 
[ 51.254381][ T925] kasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189) 
[ 51.254384][ T925] nexthop_create_group (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/linux/refcount.h:136 ./include/linux/refcount.h:142 ./include/linux/refcount.h:218 ./include/linux/refcount.h:236 ./include/net/nexthop.h:264 net/ipv4/nexthop.c:2721) 
[ 51.254391][ T925] ? __pfx_nexthop_create_group (net/ipv4/nexthop.c:2686) 
[ 51.254395][ T925] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 51.254402][ T925] rtm_new_nexthop (net/ipv4/nexthop.c:2937 net/ipv4/nexthop.c:3254) 
[ 51.254406][ T925] ? 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) 
[ 51.254411][ T925] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 51.254415][ T925] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 51.254432][ T925] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6952) 
[ 51.254439][ T925] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 51.254443][ T925] rtnetlink_rcv_msg (net/core/rtnetlink.c:6954) 
[ 51.254449][ T925] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 51.254454][ T925] ? 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) 
[ 51.254458][ T925] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 51.254465][ T925] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 51.254470][ T925] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 51.254477][ T925] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 51.254482][ T925] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 51.254494][ T925] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 51.254499][ T925] ? 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) 
[ 51.254505][ T925] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 51.254511][ T925] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 51.254516][ T925] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 51.254523][ T925] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 51.254529][ T925] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 51.254539][ T925] ____sys_sendmsg (net/socket.c:709 net/socket.c:724 net/socket.c:2563) 
[ 51.254547][ T925] ? __pfx_____sys_sendmsg (net/socket.c:2509) 
[ 51.254551][ T925] ? __pfx_copy_msghdr_from_user (net/socket.c:2489) 
[ 51.254559][ T925] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4341 kernel/locking/lockdep.c:4408) 
[ 51.254567][ T925] ___sys_sendmsg (net/socket.c:2619) 
[ 51.254574][ T925] ? __pfx____sys_sendmsg (net/socket.c:2606) 
[ 51.254579][ T925] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 51.254584][ T925] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 51.254587][ T925] ? rcu_do_batch (kernel/rcu/tree.c:2546) 
[ 51.254594][ T925] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 51.254597][ T925] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4341 kernel/locking/lockdep.c:4408) 
[ 51.254606][ T925] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4341 kernel/locking/lockdep.c:4408) 
[ 51.254617][ T925] __sys_sendmsg (net/socket.c:2649) 
[ 51.254622][ T925] ? __pfx___sys_sendmsg (net/socket.c:2634) 
[ 51.254625][ T925] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4341 kernel/locking/lockdep.c:4408) 
[ 51.254630][ T925] ? handle_softirqs (./arch/x86/include/asm/preempt.h:26 kernel/softirq.c:408 kernel/softirq.c:589) 
[ 51.254638][ T925] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 51.254645][ T925] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   51.254650][  T925] RIP: 0033:0x7f62ae3859a7
[ 51.254654][ T925] 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)
[   51.254657][  T925] RSP: 002b:00007ffe46230ed8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   51.254661][  T925] RAX: ffffffffffffffda RBX: 00007ffe46231a40 RCX: 00007f62ae3859a7
[   51.254663][  T925] RDX: 0000000000000000 RSI: 00007ffe46230f40 RDI: 0000000000000005
[   51.254665][  T925] RBP: 00007ffe46231400 R08: 00000000145c0910 R09: 0000000000000000
[   51.254667][  T925] R10: 00007f62ae23e708 R11: 0000000000000246 R12: 00000000145c0910
[   51.254669][  T925] R13: 0000000067da7309 R14: 0000000000498600 R15: 00000000145c0910
| [   51.265926][  T925] Disabling lock debugging due to kernel taint
| [   51.266466][  T925] Oops: general protection fault, probably for non-canonical address 0xdffffc000000000d: 0000 [#1] PREEMPT SMP KASAN NOPTI
| [   51.266878][  T925] KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]
| [   51.267489][  T925] Tainted: [B]=BAD_PAGE
[   51.267646][  T925] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 51.267877][ T925] RIP: 0010:nexthop_create_group (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/linux/refcount.h:136 ./include/linux/refcount.h:142 ./include/linux/refcount.h:218 ./include/linux/refcount.h:236 ./include/net/nexthop.h:264 net/ipv4/nexthop.c:2721) 
[ 51.268147][ T925] Code: 5c 09 00 00 45 3b 7e 60 72 c0 76 06 49 83 c6 08 eb bc 4d 8d 7e 68 be 04 00 00 00 4c 89 ff e8 c4 a2 27 fe 4c 89 f8 48 c1 e8 03 <42> 0f b6 14 20 4c 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85
All code
========
   0:	5c                   	pop    %rsp
   1:	09 00                	or     %eax,(%rax)
   3:	00 45 3b             	add    %al,0x3b(%rbp)
   6:	7e 60                	jle    0x68
   8:	72 c0                	jb     0xffffffffffffffca
   a:	76 06                	jbe    0x12
   c:	49 83 c6 08          	add    $0x8,%r14
  10:	eb bc                	jmp    0xffffffffffffffce
  12:	4d 8d 7e 68          	lea    0x68(%r14),%r15
  16:	be 04 00 00 00       	mov    $0x4,%esi
  1b:	4c 89 ff             	mov    %r15,%rdi
  1e:	e8 c4 a2 27 fe       	call   0xfffffffffe27a2e7
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
  2a:*	42 0f b6 14 20       	movzbl (%rax,%r12,1),%edx		<-- trapping instruction
  2f:	4c 89 f8             	mov    %r15,%rax
  32:	83 e0 07             	and    $0x7,%eax
  35:	83 c0 03             	add    $0x3,%eax
  38:	38 d0                	cmp    %dl,%al
  3a:	7c 08                	jl     0x44
  3c:	84 d2                	test   %dl,%dl
  3e:	0f                   	.byte 0xf
  3f:	85                   	.byte 0x85

Code starting with the faulting instruction
===========================================
   0:	42 0f b6 14 20       	movzbl (%rax,%r12,1),%edx
   5:	4c 89 f8             	mov    %r15,%rax
   8:	83 e0 07             	and    $0x7,%eax
   b:	83 c0 03             	add    $0x3,%eax
   e:	38 d0                	cmp    %dl,%al
  10:	7c 08                	jl     0x1a
  12:	84 d2                	test   %dl,%dl
  14:	0f                   	.byte 0xf
  15:	85                   	.byte 0x85
[   51.268936][  T925] RSP: 0018:ffffc90001fa73c8 EFLAGS: 00010202
[   51.269223][  T925] RAX: 000000000000000d RBX: ffff88800fce66e8 RCX: ffffffff8c65e00a
[   51.269562][  T925] RDX: fffffbfff2445891 RSI: 0000000000000008 RDI: ffffffff9222c480
[   51.269905][  T925] RBP: 0000000000000000 R08: 0000000000000001 R09: fffffbfff2445890
[   51.270237][  T925] R10: ffffffff9222c487 R11: 205d353239542020 R12: dffffc0000000000
[   51.270570][  T925] R13: ffff88800bb4c080 R14: 0000000000000000 R15: 0000000000000068
[   51.270903][  T925] FS:  00007f62ae179800(0000) GS:ffff88806cf80000(0000) knlGS:0000000000000000
[   51.271294][  T925] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   51.271585][  T925] CR2: 00007f62ae3d5423 CR3: 00000000028bc002 CR4: 0000000000772ef0
[   51.271923][  T925] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   51.272253][  T925] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   51.272525][  T925] PKRU: 55555554
[   51.272647][  T925] Call Trace:
[   51.272761][  T925]  <TASK>
[ 51.272841][ T925] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) 
[ 51.272990][ T925] ? exc_general_protection (arch/x86/kernel/traps.c:751 arch/x86/kernel/traps.c:693) 
[ 51.273182][ T925] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617) 
[ 51.273335][ T925] ? add_taint (./arch/x86/include/asm/bitops.h:60 ./include/asm-generic/bitops/instrumented-atomic.h:29 kernel/panic.c:605) 
[ 51.273450][ T925] ? nexthop_create_group (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/linux/refcount.h:136 ./include/linux/refcount.h:142 ./include/linux/refcount.h:218 ./include/linux/refcount.h:236 ./include/net/nexthop.h:264 net/ipv4/nexthop.c:2721) 
[ 51.273601][ T925] ? nexthop_create_group (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/linux/refcount.h:136 ./include/linux/refcount.h:142 ./include/linux/refcount.h:218 ./include/linux/refcount.h:236 ./include/net/nexthop.h:264 net/ipv4/nexthop.c:2721) 
[ 51.273758][ T925] ? __pfx_nexthop_create_group (net/ipv4/nexthop.c:2686) 
[ 51.273907][ T925] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 51.274057][ T925] rtm_new_nexthop (net/ipv4/nexthop.c:2937 net/ipv4/nexthop.c:3254) 
[ 51.274250][ T925] ? 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) 
[ 51.274450][ T925] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 51.274601][ T925] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 51.274815][ T925] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6952) 
[ 51.275022][ T925] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 51.275238][ T925] rtnetlink_rcv_msg (net/core/rtnetlink.c:6954) 
[ 51.275427][ T925] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 51.275576][ T925] ? 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) 
[ 51.275725][ T925] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 51.275839][ T925] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 51.275992][ T925] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 51.276163][ T925] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 51.276348][ T925] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 51.276502][ T925] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 51.276652][ T925] ? 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) 
[ 51.276847][ T925] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 51.277035][ T925] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 51.277215][ T925] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 51.277426][ T925] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 51.277600][ T925] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 51.277767][ T925] ____sys_sendmsg (net/socket.c:709 net/socket.c:724 net/socket.c:2563) 
[ 51.277918][ T925] ? __pfx_____sys_sendmsg (net/socket.c:2509) 
[ 51.278062][ T925] ? __pfx_copy_msghdr_from_user (net/socket.c:2489) 
[ 51.278266][ T925] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4341 kernel/locking/lockdep.c:4408) 
[ 51.278508][ T925] ___sys_sendmsg (net/socket.c:2619) 
[ 51.278664][ T925] ? __pfx____sys_sendmsg (net/socket.c:2606) 
[ 51.278814][ T925] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 51.278963][ T925] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 51.279115][ T925] ? rcu_do_batch (kernel/rcu/tree.c:2546) 
[ 51.279269][ T925] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 51.279433][ T925] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4341 kernel/locking/lockdep.c:4408) 
[ 51.279660][ T925] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4341 kernel/locking/lockdep.c:4408) 
[ 51.279887][ T925] __sys_sendmsg (net/socket.c:2649) 
[ 51.280038][ T925] ? __pfx___sys_sendmsg (net/socket.c:2634) 
[ 51.280192][ T925] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4341 kernel/locking/lockdep.c:4408) 
[ 51.280430][ T925] ? handle_softirqs (./arch/x86/include/asm/preempt.h:26 kernel/softirq.c:408 kernel/softirq.c:589) 
[ 51.280624][ T925] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 51.280811][ T925] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   51.281020][  T925] RIP: 0033:0x7f62ae3859a7
[ 51.281241][ T925] 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)
[   51.281807][  T925] RSP: 002b:00007ffe46230ed8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   51.282107][  T925] RAX: ffffffffffffffda RBX: 00007ffe46231a40 RCX: 00007f62ae3859a7
[   51.282418][  T925] RDX: 0000000000000000 RSI: 00007ffe46230f40 RDI: 0000000000000005
[   51.282665][  T925] RBP: 00007ffe46231400 R08: 00000000145c0910 R09: 0000000000000000
[   51.283047][  T925] R10: 00007f62ae23e708 R11: 0000000000000246 R12: 00000000145c0910


Finger prints:
nexthop_create_group:rtm_new_nexthop:rtnetlink_rcv_msg:netlink_rcv_skb:netlink_unicast
kasan_report:kasan_check_range:nexthop_create_group:rtm_new_nexthop:rtnetlink_rcv_msg