======================================
| [   13.072804][  T311] ==================================================================
| [ 13.073051][ T311] 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) 
| [   13.073265][  T311] Read of size 4 at addr 0000000000000068 by task ip/311
| [   13.073433][  T311]
[   13.073509][  T311] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.073511][  T311] Call Trace:
[   13.073513][  T311]  <TASK>
[ 13.073515][ T311] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.073523][ T311] kasan_report (mm/kasan/report.c:636) 
[ 13.073531][ T311] ? 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) 
[ 13.073537][ T311] kasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189) 
[ 13.073542][ T311] 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) 
[ 13.073548][ T311] ? __pfx_nexthop_create_group (net/ipv4/nexthop.c:2686) 
[ 13.073552][ T311] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 13.073562][ T311] rtm_new_nexthop (net/ipv4/nexthop.c:2937 net/ipv4/nexthop.c:3254) 
[ 13.073567][ T311] ? 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) 
[ 13.073574][ T311] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 13.073577][ T311] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 13.073590][ T311] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6952) 
[ 13.073597][ T311] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 13.073600][ T311] rtnetlink_rcv_msg (net/core/rtnetlink.c:6954) 
[ 13.073605][ T311] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 13.073608][ T311] ? 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) 
[ 13.073611][ T311] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 13.073615][ T311] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 13.073619][ T311] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 13.073624][ T311] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 13.073628][ T311] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 13.073636][ T311] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 13.073641][ T311] ? 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) 
[ 13.073646][ T311] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 13.073650][ T311] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 13.073652][ T311] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 13.073658][ T311] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 13.073662][ T311] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 13.073668][ T311] ____sys_sendmsg (net/socket.c:709 net/socket.c:724 net/socket.c:2563) 
[ 13.073675][ T311] ? __pfx_____sys_sendmsg (net/socket.c:2509) 
[ 13.073678][ T311] ? __pfx_copy_msghdr_from_user (net/socket.c:2489) 
[ 13.073686][ T311] ___sys_sendmsg (net/socket.c:2619) 
[ 13.073688][ T311] ? 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) 
[ 13.073692][ T311] ? __pfx____sys_sendmsg (net/socket.c:2606) 
[ 13.073696][ T311] ? hlock_class (kernel/locking/lockdep.c:225) 
[ 13.073702][ T311] ? 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) 
[ 13.073708][ T311] ? 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) 
[ 13.073714][ T311] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 13.073718][ T311] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 13.073722][ T311] __sys_sendmsg (net/socket.c:2649) 
[ 13.073724][ T311] ? __pfx___sys_sendmsg (net/socket.c:2634) 
[ 13.073729][ T311] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 13.073735][ T311] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 13.073740][ T311] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   13.073745][  T311] RIP: 0033:0x7fea939369a7
[ 13.073749][ T311] 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)
[   13.073752][  T311] RSP: 002b:00007ffc0e4b2db8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   13.073757][  T311] RAX: ffffffffffffffda RBX: 00007ffc0e4b3920 RCX: 00007fea939369a7
[   13.073759][  T311] RDX: 0000000000000000 RSI: 00007ffc0e4b2e20 RDI: 0000000000000005
[   13.073761][  T311] RBP: 00007ffc0e4b32e0 R08: 000000002219c910 R09: 0000000000000000
[   13.073763][  T311] R10: 00007fea937ef708 R11: 0000000000000246 R12: 000000002219c918
[   13.073764][  T311] R13: 0000000067da6086 R14: 0000000000498600 R15: 000000002219c910
| [   13.081979][  T311] Disabling lock debugging due to kernel taint
| [   13.082172][  T311] Oops: general protection fault, probably for non-canonical address 0xdffffc000000000d: 0000 [#1] PREEMPT SMP KASAN NOPTI
| [   13.082499][  T311] KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]
| [   13.082928][  T311] Tainted: [B]=BAD_PAGE
[   13.083028][  T311] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 13.083198][ T311] 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) 
[ 13.083371][ T311] 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 34 7e 32 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 34 7e 32 fe       	call   0xfffffffffe327e57
  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
[   13.083839][  T311] RSP: 0018:ffffc900008173c8 EFLAGS: 00010202
[   13.084005][  T311] RAX: 000000000000000d RBX: ffff8880052e91e8 RCX: ffffffff93251d8a
[   13.084209][  T311] RDX: fffffbfff309f891 RSI: 0000000000000008 RDI: ffffffff984fc480
[   13.084408][  T311] RBP: 0000000000000000 R08: 0000000000000001 R09: fffffbfff309f890
[   13.084608][  T311] R10: ffffffff984fc487 R11: 205d313133542020 R12: dffffc0000000000
[   13.084817][  T311] R13: ffff888009d104c0 R14: 0000000000000000 R15: 0000000000000068
[   13.085010][  T311] FS:  00007fea9372a800(0000) GS:ffff888036000000(0000) knlGS:0000000000000000
[   13.085240][  T311] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   13.085420][  T311] CR2: 00007fea93986423 CR3: 000000000ba52001 CR4: 0000000000772ef0
[   13.085618][  T311] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   13.085817][  T311] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   13.086007][  T311] PKRU: 55555554
[   13.086105][  T311] Call Trace:
[   13.086203][  T311]  <TASK>
[ 13.086273][ T311] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) 
[ 13.086380][ T311] ? exc_general_protection (arch/x86/kernel/traps.c:751 arch/x86/kernel/traps.c:693) 
[ 13.086516][ T311] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617) 
[ 13.086652][ T311] ? add_taint (./arch/x86/include/asm/bitops.h:60 ./include/asm-generic/bitops/instrumented-atomic.h:29 kernel/panic.c:605) 
[ 13.086752][ T311] ? 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) 
[ 13.086882][ T311] ? 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) 
[ 13.087012][ T311] ? __pfx_nexthop_create_group (net/ipv4/nexthop.c:2686) 
[ 13.087140][ T311] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 13.087275][ T311] rtm_new_nexthop (net/ipv4/nexthop.c:2937 net/ipv4/nexthop.c:3254) 
[ 13.087412][ T311] ? 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) 
[ 13.087544][ T311] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 13.087641][ T311] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 13.087777][ T311] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6952) 
[ 13.087906][ T311] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 13.088034][ T311] rtnetlink_rcv_msg (net/core/rtnetlink.c:6954) 
[ 13.088174][ T311] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 13.088306][ T311] ? 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) 
[ 13.088434][ T311] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 13.088537][ T311] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 13.088664][ T311] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 13.088794][ T311] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 13.088923][ T311] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 13.089057][ T311] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 13.089188][ T311] ? 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) 
[ 13.089321][ T311] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 13.089450][ T311] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 13.089579][ T311] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 13.089709][ T311] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 13.089841][ T311] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 13.089972][ T311] ____sys_sendmsg (net/socket.c:709 net/socket.c:724 net/socket.c:2563) 
[ 13.090102][ T311] ? __pfx_____sys_sendmsg (net/socket.c:2509) 
[ 13.090236][ T311] ? __pfx_copy_msghdr_from_user (net/socket.c:2489) 
[ 13.090397][ T311] ___sys_sendmsg (net/socket.c:2619) 
[ 13.090524][ T311] ? 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) 
[ 13.090654][ T311] ? __pfx____sys_sendmsg (net/socket.c:2606) 
[ 13.090782][ T311] ? hlock_class (kernel/locking/lockdep.c:225) 
[ 13.090916][ T311] ? 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) 
[ 13.091046][ T311] ? 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) 
[ 13.091180][ T311] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 13.091313][ T311] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 13.091445][ T311] __sys_sendmsg (net/socket.c:2649) 
[ 13.091575][ T311] ? __pfx___sys_sendmsg (net/socket.c:2634) 
[ 13.091704][ T311] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 13.091834][ T311] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 13.091964][ T311] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   13.092130][  T311] RIP: 0033:0x7fea939369a7
[ 13.092263][ T311] 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)
[   13.092715][  T311] RSP: 002b:00007ffc0e4b2db8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   13.092913][  T311] RAX: ffffffffffffffda RBX: 00007ffc0e4b3920 RCX: 00007fea939369a7
[   13.093108][  T311] RDX: 0000000000000000 RSI: 00007ffc0e4b2e20 RDI: 0000000000000005
[   13.093302][  T311] RBP: 00007ffc0e4b32e0 R08: 000000002219c910 R09: 0000000000000000
[   13.093497][  T311] R10: 00007fea937ef708 R11: 0000000000000246 R12: 000000002219c918


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