======================================
| [   15.975423][  T341] ==================================================================
| [ 15.975686][ T341] 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) 
| [   15.975931][  T341] Read of size 4 at addr 0000000000000068 by task ip/341
| [   15.976097][  T341]
[   15.976182][  T341] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.976184][  T341] Call Trace:
[   15.976186][  T341]  <TASK>
[ 15.976187][ T341] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.976194][ T341] kasan_report (mm/kasan/report.c:636) 
[ 15.976199][ T341] ? 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) 
[ 15.976205][ T341] kasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189) 
[ 15.976209][ T341] 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) 
[ 15.976215][ T341] ? __pfx_nexthop_create_group (net/ipv4/nexthop.c:2686) 
[ 15.976218][ T341] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 15.976225][ T341] rtm_new_nexthop (net/ipv4/nexthop.c:2937 net/ipv4/nexthop.c:3254) 
[ 15.976229][ T341] ? 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) 
[ 15.976233][ T341] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 15.976237][ T341] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 15.976249][ T341] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6952) 
[ 15.976255][ T341] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 15.976258][ T341] rtnetlink_rcv_msg (net/core/rtnetlink.c:6954) 
[ 15.976263][ T341] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 15.976267][ T341] ? 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) 
[ 15.976269][ T341] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 15.976274][ T341] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 15.976278][ T341] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 15.976282][ T341] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 15.976286][ T341] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 15.976294][ T341] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 15.976297][ T341] ? 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) 
[ 15.976301][ T341] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 15.976305][ T341] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 15.976308][ T341] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 15.976312][ T341] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 15.976316][ T341] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 15.976322][ T341] ____sys_sendmsg (net/socket.c:709 net/socket.c:724 net/socket.c:2563) 
[ 15.976328][ T341] ? __pfx_____sys_sendmsg (net/socket.c:2509) 
[ 15.976331][ T341] ? __pfx_copy_msghdr_from_user (net/socket.c:2489) 
[ 15.976338][ T341] ___sys_sendmsg (net/socket.c:2619) 
[ 15.976341][ T341] ? 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) 
[ 15.976344][ T341] ? __pfx____sys_sendmsg (net/socket.c:2606) 
[ 15.976348][ T341] ? hlock_class (kernel/locking/lockdep.c:225) 
[ 15.976353][ T341] ? 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) 
[ 15.976357][ T341] ? 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) 
[ 15.976361][ T341] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 15.976365][ T341] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 15.976369][ T341] __sys_sendmsg (net/socket.c:2649) 
[ 15.976372][ T341] ? __pfx___sys_sendmsg (net/socket.c:2634) 
[ 15.976377][ T341] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 15.976382][ T341] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 15.976386][ T341] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   15.976391][  T341] RIP: 0033:0x7fb20d91d9a7
[ 15.976394][ T341] 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)
[   15.976397][  T341] RSP: 002b:00007ffd6ea3f2b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   15.976401][  T341] RAX: ffffffffffffffda RBX: 00007ffd6ea3fe10 RCX: 00007fb20d91d9a7
[   15.976403][  T341] RDX: 0000000000000000 RSI: 00007ffd6ea3f320 RDI: 0000000000000005
[   15.976405][  T341] RBP: 00007ffd6ea3f7e0 R08: 000000003b554910 R09: 0000000000000000
[   15.976407][  T341] R10: 00007fb20d7d6708 R11: 0000000000000246 R12: 000000003b554918
[   15.976409][  T341] R13: 0000000067da665e R14: 0000000000498600 R15: 000000003b554910
| [   15.987560][  T341] Disabling lock debugging due to kernel taint
| [   15.987852][  T341] Oops: general protection fault, probably for non-canonical address 0xdffffc000000000d: 0000 [#1] PREEMPT SMP KASAN NOPTI
| [   15.988353][  T341] KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]
| [   15.989042][  T341] Tainted: [B]=BAD_PAGE
[   15.989218][  T341] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.989465][ T341] 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) 
[ 15.989737][ T341] 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 84 19 2f 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 84 19 2f fe       	call   0xfffffffffe2f19a7
  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
[   15.990452][  T341] RSP: 0018:ffffc900006173c8 EFLAGS: 00010202
[   15.990720][  T341] RAX: 000000000000000d RBX: ffff88800e1203e8 RCX: ffffffff9a253d8a
[   15.991026][  T341] RDX: fffffbfff3ea2491 RSI: 0000000000000008 RDI: ffffffff9f512480
[   15.991326][  T341] RBP: 0000000000000000 R08: 0000000000000001 R09: fffffbfff3ea2490
[   15.991616][  T341] R10: ffffffff9f512487 R11: 205d313433542020 R12: dffffc0000000000
[   15.991926][  T341] R13: ffff8880098d0340 R14: 0000000000000000 R15: 0000000000000068
[   15.992230][  T341] FS:  00007fb20d711800(0000) GS:ffff888036180000(0000) knlGS:0000000000000000
[   15.992586][  T341] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   15.992847][  T341] CR2: 00007fb20d96d423 CR3: 000000000e2fe001 CR4: 0000000000772ef0
[   15.993149][  T341] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   15.993464][  T341] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   15.993772][  T341] PKRU: 55555554
[   15.993942][  T341] Call Trace:
[   15.994103][  T341]  <TASK>
[ 15.994214][ T341] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) 
[ 15.994386][ T341] ? exc_general_protection (arch/x86/kernel/traps.c:751 arch/x86/kernel/traps.c:693) 
[ 15.994625][ T341] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617) 
[ 15.994847][ T341] ? add_taint (./arch/x86/include/asm/bitops.h:60 ./include/asm-generic/bitops/instrumented-atomic.h:29 kernel/panic.c:605) 
[ 15.995005][ T341] ? 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) 
[ 15.995203][ T341] ? 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) 
[ 15.995408][ T341] ? __pfx_nexthop_create_group (net/ipv4/nexthop.c:2686) 
[ 15.995610][ T341] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 15.995817][ T341] rtm_new_nexthop (net/ipv4/nexthop.c:2937 net/ipv4/nexthop.c:3254) 
[ 15.996034][ T341] ? 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) 
[ 15.996234][ T341] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 15.996394][ T341] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 15.996612][ T341] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6952) 
[ 15.996824][ T341] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 15.997032][ T341] rtnetlink_rcv_msg (net/core/rtnetlink.c:6954) 
[ 15.997240][ T341] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 15.997452][ T341] ? 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) 
[ 15.997651][ T341] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 15.997834][ T341] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 15.998056][ T341] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 15.998268][ T341] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 15.998488][ T341] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 15.998700][ T341] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 15.998904][ T341] ? 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) 
[ 15.999112][ T341] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 15.999326][ T341] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 15.999530][ T341] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 15.999743][ T341] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 15.999947][ T341] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 16.000160][ T341] ____sys_sendmsg (net/socket.c:709 net/socket.c:724 net/socket.c:2563) 
[ 16.000368][ T341] ? __pfx_____sys_sendmsg (net/socket.c:2509) 
[ 16.000577][ T341] ? __pfx_copy_msghdr_from_user (net/socket.c:2489) 
[ 16.000844][ T341] ___sys_sendmsg (net/socket.c:2619) 
[ 16.001064][ T341] ? 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) 
[ 16.001279][ T341] ? __pfx____sys_sendmsg (net/socket.c:2606) 
[ 16.001482][ T341] ? hlock_class (kernel/locking/lockdep.c:225) 
[ 16.001687][ T341] ? 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) 
[ 16.001894][ T341] ? 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) 
[ 16.002113][ T341] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 16.002318][ T341] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 16.002525][ T341] __sys_sendmsg (net/socket.c:2649) 
[ 16.002732][ T341] ? __pfx___sys_sendmsg (net/socket.c:2634) 
[ 16.002946][ T341] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 16.003156][ T341] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 16.003366][ T341] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   16.003630][  T341] RIP: 0033:0x7fb20d91d9a7
[ 16.003847][ T341] 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)
[   16.004554][  T341] RSP: 002b:00007ffd6ea3f2b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   16.004868][  T341] RAX: ffffffffffffffda RBX: 00007ffd6ea3fe10 RCX: 00007fb20d91d9a7
[   16.005177][  T341] RDX: 0000000000000000 RSI: 00007ffd6ea3f320 RDI: 0000000000000005
[   16.005483][  T341] RBP: 00007ffd6ea3f7e0 R08: 000000003b554910 R09: 0000000000000000
[   16.005792][  T341] R10: 00007fb20d7d6708 R11: 0000000000000246 R12: 000000003b554918


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