======================================
| [   16.379387][  T344] ==================================================================
| [ 16.379652][ T344] 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) 
| [   16.379875][  T344] Read of size 4 at addr 0000000000000068 by task ip/344
| [   16.380054][  T344]
[   16.380143][  T344] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.380145][  T344] Call Trace:
[   16.380147][  T344]  <TASK>
[ 16.380149][ T344] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.380155][ T344] kasan_report (mm/kasan/report.c:636) 
[ 16.380161][ T344] ? 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) 
[ 16.380166][ T344] kasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189) 
[ 16.380170][ T344] 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) 
[ 16.380176][ T344] ? __pfx_nexthop_create_group (net/ipv4/nexthop.c:2686) 
[ 16.380179][ T344] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 16.380186][ T344] rtm_new_nexthop (net/ipv4/nexthop.c:2937 net/ipv4/nexthop.c:3254) 
[ 16.380190][ T344] ? 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) 
[ 16.380194][ T344] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 16.380198][ T344] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 16.380211][ T344] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6952) 
[ 16.380217][ T344] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 16.380220][ T344] rtnetlink_rcv_msg (net/core/rtnetlink.c:6954) 
[ 16.380225][ T344] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 16.380228][ T344] ? 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) 
[ 16.380231][ T344] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 16.380235][ T344] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 16.380240][ T344] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 16.380244][ T344] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 16.380248][ T344] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 16.380255][ T344] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 16.380259][ T344] ? 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) 
[ 16.380262][ T344] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 16.380266][ T344] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 16.380269][ T344] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 16.380273][ T344] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 16.380277][ T344] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 16.380283][ T344] ____sys_sendmsg (net/socket.c:709 net/socket.c:724 net/socket.c:2563) 
[ 16.380289][ T344] ? __pfx_____sys_sendmsg (net/socket.c:2509) 
[ 16.380292][ T344] ? __pfx_copy_msghdr_from_user (net/socket.c:2489) 
[ 16.380299][ T344] ___sys_sendmsg (net/socket.c:2619) 
[ 16.380301][ T344] ? 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) 
[ 16.380305][ T344] ? __pfx____sys_sendmsg (net/socket.c:2606) 
[ 16.380309][ T344] ? hlock_class (kernel/locking/lockdep.c:225) 
[ 16.380314][ T344] ? 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) 
[ 16.380318][ T344] ? 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) 
[ 16.380322][ T344] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 16.380325][ T344] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 16.380329][ T344] __sys_sendmsg (net/socket.c:2649) 
[ 16.380332][ T344] ? __pfx___sys_sendmsg (net/socket.c:2634) 
[ 16.380338][ T344] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 16.380342][ T344] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 16.380347][ T344] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   16.380352][  T344] RIP: 0033:0x7f413a54c9a7
[ 16.380355][ T344] 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)
[   16.380358][  T344] RSP: 002b:00007ffe93a53d38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   16.380362][  T344] RAX: ffffffffffffffda RBX: 00007ffe93a54890 RCX: 00007f413a54c9a7
[   16.380365][  T344] RDX: 0000000000000000 RSI: 00007ffe93a53da0 RDI: 0000000000000005
[   16.380368][  T344] RBP: 00007ffe93a54260 R08: 000000002e764910 R09: 0000000000000000
[   16.380371][  T344] R10: 00007f413a405708 R11: 0000000000000246 R12: 000000002e764918
[   16.380374][  T344] R13: 0000000067da3f98 R14: 0000000000498600 R15: 000000002e764910
| [   16.389418][  T344] Disabling lock debugging due to kernel taint
| [   16.389615][  T344] Oops: general protection fault, probably for non-canonical address 0xdffffc000000000d: 0000 [#1] PREEMPT SMP KASAN NOPTI
| [   16.389949][  T344] KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]
| [   16.390404][  T344] Tainted: [B]=BAD_PAGE
[   16.390505][  T344] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.390678][ T344] 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) 
[ 16.390864][ T344] 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
[   16.391354][  T344] RSP: 0018:ffffc900006273c8 EFLAGS: 00010202
[   16.391526][  T344] RAX: 000000000000000d RBX: ffff88800bb1c068 RCX: ffffffff98053d8a
[   16.391730][  T344] RDX: fffffbfff3a62491 RSI: 0000000000000008 RDI: ffffffff9d312480
[   16.391935][  T344] RBP: 0000000000000000 R08: 0000000000000001 R09: fffffbfff3a62490
[   16.392145][  T344] R10: ffffffff9d312487 R11: 205d343433542020 R12: dffffc0000000000
[   16.392367][  T344] R13: ffff888008ca3540 R14: 0000000000000000 R15: 0000000000000068
[   16.392567][  T344] FS:  00007f413a340800(0000) GS:ffff888036180000(0000) knlGS:0000000000000000
[   16.392796][  T344] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   16.392965][  T344] CR2: 00007f413a59c423 CR3: 000000000da7c006 CR4: 0000000000772ef0
[   16.393165][  T344] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   16.393362][  T344] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   16.393556][  T344] PKRU: 55555554
[   16.393655][  T344] Call Trace:
[   16.393767][  T344]  <TASK>
[ 16.393836][ T344] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) 
[ 16.393950][ T344] ? exc_general_protection (arch/x86/kernel/traps.c:751 arch/x86/kernel/traps.c:693) 
[ 16.394099][ T344] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617) 
[ 16.394233][ T344] ? add_taint (./arch/x86/include/asm/bitops.h:60 ./include/asm-generic/bitops/instrumented-atomic.h:29 kernel/panic.c:605) 
[ 16.394348][ T344] ? 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) 
[ 16.394480][ T344] ? 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) 
[ 16.394619][ T344] ? __pfx_nexthop_create_group (net/ipv4/nexthop.c:2686) 
[ 16.394758][ T344] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 16.394898][ T344] rtm_new_nexthop (net/ipv4/nexthop.c:2937 net/ipv4/nexthop.c:3254) 
[ 16.395039][ T344] ? 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) 
[ 16.395181][ T344] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 16.395287][ T344] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 16.395431][ T344] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6952) 
[ 16.395572][ T344] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 16.395709][ T344] rtnetlink_rcv_msg (net/core/rtnetlink.c:6954) 
[ 16.395841][ T344] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 16.395986][ T344] ? 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) 
[ 16.396124][ T344] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 16.396225][ T344] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 16.396366][ T344] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 16.396507][ T344] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 16.396638][ T344] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 16.396780][ T344] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 16.396923][ T344] ? 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) 
[ 16.397059][ T344] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 16.397193][ T344] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 16.397332][ T344] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 16.397473][ T344] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 16.397603][ T344] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 16.397755][ T344] ____sys_sendmsg (net/socket.c:709 net/socket.c:724 net/socket.c:2563) 
[ 16.397890][ T344] ? __pfx_____sys_sendmsg (net/socket.c:2509) 
[ 16.398019][ T344] ? __pfx_copy_msghdr_from_user (net/socket.c:2489) 
[ 16.398193][ T344] ___sys_sendmsg (net/socket.c:2619) 
[ 16.398322][ T344] ? 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) 
[ 16.398452][ T344] ? __pfx____sys_sendmsg (net/socket.c:2606) 
[ 16.398583][ T344] ? hlock_class (kernel/locking/lockdep.c:225) 
[ 16.398715][ T344] ? 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) 
[ 16.398848][ T344] ? 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) 
[ 16.398980][ T344] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 16.399120][ T344] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 16.399253][ T344] __sys_sendmsg (net/socket.c:2649) 
[ 16.399404][ T344] ? __pfx___sys_sendmsg (net/socket.c:2634) 
[ 16.399537][ T344] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 16.399668][ T344] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 16.399803][ T344] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   16.399977][  T344] RIP: 0033:0x7f413a54c9a7
[ 16.400124][ T344] 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)
[   16.400609][  T344] RSP: 002b:00007ffe93a53d38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   16.400818][  T344] RAX: ffffffffffffffda RBX: 00007ffe93a54890 RCX: 00007f413a54c9a7
[   16.401014][  T344] RDX: 0000000000000000 RSI: 00007ffe93a53da0 RDI: 0000000000000005
[   16.401210][  T344] RBP: 00007ffe93a54260 R08: 000000002e764910 R09: 0000000000000000
[   16.401405][  T344] R10: 00007f413a405708 R11: 0000000000000246 R12: 000000002e764918


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