======================================
| [ 2413.306826][T24687] ==================================================================
| [2413.307081][T24687] 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) 
| [ 2413.307294][T24687] Read of size 4 at addr 0000000000000068 by task ip/24687
| [ 2413.307495][T24687]
[ 2413.307574][T24687] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 2413.307577][T24687] Call Trace:
[ 2413.307579][T24687]  <TASK>
[2413.307581][T24687] dump_stack_lvl (lib/dump_stack.c:123) 
[2413.307591][T24687] kasan_report (mm/kasan/report.c:636) 
[2413.307601][T24687] ? 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) 
[2413.307607][T24687] kasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189) 
[2413.307611][T24687] 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) 
[2413.307618][T24687] ? __pfx_nexthop_create_group (net/ipv4/nexthop.c:2686) 
[2413.307622][T24687] ? __nla_validate_parse (lib/nlattr.c:638) 
[2413.307630][T24687] rtm_new_nexthop (net/ipv4/nexthop.c:2937 net/ipv4/nexthop.c:3254) 
[2413.307634][T24687] ? 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) 
[2413.307640][T24687] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[2413.307645][T24687] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[2413.307657][T24687] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6952) 
[2413.307665][T24687] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[2413.307668][T24687] rtnetlink_rcv_msg (net/core/rtnetlink.c:6954) 
[2413.307672][T24687] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[2413.307676][T24687] ? 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) 
[2413.307679][T24687] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[2413.307684][T24687] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[2413.307688][T24687] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[2413.307694][T24687] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[2413.307698][T24687] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[2413.307706][T24687] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[2413.307709][T24687] ? 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) 
[2413.307713][T24687] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[2413.307717][T24687] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[2413.307721][T24687] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[2413.307726][T24687] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[2413.307730][T24687] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[2413.307737][T24687] ____sys_sendmsg (net/socket.c:709 net/socket.c:724 net/socket.c:2563) 
[2413.307743][T24687] ? __pfx_____sys_sendmsg (net/socket.c:2509) 
[2413.307746][T24687] ? __pfx_copy_msghdr_from_user (net/socket.c:2489) 
[2413.307755][T24687] ___sys_sendmsg (net/socket.c:2619) 
[2413.307759][T24687] ? 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) 
[2413.307763][T24687] ? __pfx____sys_sendmsg (net/socket.c:2606) 
[2413.307768][T24687] ? usage_skip (kernel/locking/lockdep.c:2316 kernel/locking/lockdep.c:2284) 
[2413.307773][T24687] ? 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) 
[2413.307779][T24687] ? 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) 
[2413.307784][T24687] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[2413.307787][T24687] ? __lock_release (kernel/locking/lockdep.c:5527) 
[2413.307791][T24687] __sys_sendmsg (net/socket.c:2649) 
[2413.307795][T24687] ? __pfx___sys_sendmsg (net/socket.c:2634) 
[2413.307801][T24687] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[2413.307806][T24687] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[2413.307812][T24687] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 2413.307817][T24687] RIP: 0033:0x7f9b0e5269a7
[ 2413.307821][T24687] 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)
[ 2413.307824][T24687] RSP: 002b:00007ffecdf60ee8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 2413.307828][T24687] RAX: ffffffffffffffda RBX: 00007ffecdf61a40 RCX: 00007f9b0e5269a7
[ 2413.307830][T24687] RDX: 0000000000000000 RSI: 00007ffecdf60f50 RDI: 0000000000000005
[ 2413.307832][T24687] RBP: 00007ffecdf61410 R08: 0000000004806910 R09: 0000000000000000
[ 2413.307834][T24687] R10: 00007f9b0e3df708 R11: 0000000000000246 R12: 0000000004806918
[ 2413.307836][T24687] R13: 0000000067da5224 R14: 0000000000498600 R15: 0000000004806910
| [ 2413.316649][T24687] Disabling lock debugging due to kernel taint
| [ 2413.316835][T24687] Oops: general protection fault, probably for non-canonical address 0xdffffc000000000d: 0000 [#1] PREEMPT SMP KASAN NOPTI
| [ 2413.317159][T24687] KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]
| [ 2413.317585][T24687] Tainted: [B]=BAD_PAGE
[ 2413.317687][T24687] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[2413.317852][T24687] 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) 
[ 2413.318026][T24687] 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
[ 2413.318486][T24687] RSP: 0018:ffffc900099973c8 EFLAGS: 00010202
[ 2413.318653][T24687] RAX: 000000000000000d RBX: ffff88801ef21fe8 RCX: ffffffffb0c5e00a
[ 2413.318848][T24687] RDX: fffffbfff6d05891 RSI: 0000000000000008 RDI: ffffffffb682c480
[ 2413.319047][T24687] RBP: 0000000000000000 R08: 0000000000000001 R09: fffffbfff6d05890
[ 2413.319242][T24687] R10: ffffffffb682c487 R11: 205d373836343254 R12: dffffc0000000000
[ 2413.319512][T24687] R13: ffff88801e655840 R14: 0000000000000000 R15: 0000000000000068
[ 2413.319707][T24687] FS:  00007f9b0e31a800(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
[ 2413.320009][T24687] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2413.320177][T24687] CR2: 00007f9b0e576429 CR3: 000000001f6d0004 CR4: 0000000000772ef0
[ 2413.320373][T24687] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 2413.320638][T24687] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 2413.320837][T24687] PKRU: 55555554
[ 2413.320938][T24687] Call Trace:
[ 2413.321036][T24687]  <TASK>
[2413.321176][T24687] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) 
[2413.321281][T24687] ? exc_general_protection (arch/x86/kernel/traps.c:751 arch/x86/kernel/traps.c:693) 
[2413.321415][T24687] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617) 
[2413.321547][T24687] ? add_taint (./arch/x86/include/asm/bitops.h:60 ./include/asm-generic/bitops/instrumented-atomic.h:29 kernel/panic.c:605) 
[2413.321647][T24687] ? 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) 
[2413.321855][T24687] ? 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) 
[2413.321991][T24687] ? __pfx_nexthop_create_group (net/ipv4/nexthop.c:2686) 
[2413.322123][T24687] ? __nla_validate_parse (lib/nlattr.c:638) 
[2413.322255][T24687] rtm_new_nexthop (net/ipv4/nexthop.c:2937 net/ipv4/nexthop.c:3254) 
[2413.322457][T24687] ? 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) 
[2413.322591][T24687] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[2413.322691][T24687] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[2413.322831][T24687] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6952) 
[2413.323033][T24687] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[2413.323165][T24687] rtnetlink_rcv_msg (net/core/rtnetlink.c:6954) 
[2413.323294][T24687] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[2413.323424][T24687] ? 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) 
[2413.323619][T24687] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[2413.323722][T24687] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[2413.323854][T24687] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[2413.323990][T24687] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[2413.324190][T24687] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[2413.324326][T24687] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[2413.324455][T24687] ? 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) 
[2413.324585][T24687] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[2413.324788][T24687] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[2413.324922][T24687] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[2413.325054][T24687] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[2413.325185][T24687] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[2413.325318][T24687] ____sys_sendmsg (net/socket.c:709 net/socket.c:724 net/socket.c:2563) 
[2413.325451][T24687] ? __pfx_____sys_sendmsg (net/socket.c:2509) 
[2413.325579][T24687] ? __pfx_copy_msghdr_from_user (net/socket.c:2489) 
[2413.325745][T24687] ___sys_sendmsg (net/socket.c:2619) 
[2413.325957][T24687] ? 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) 
[2413.326090][T24687] ? __pfx____sys_sendmsg (net/socket.c:2606) 
[2413.326220][T24687] ? usage_skip (kernel/locking/lockdep.c:2316 kernel/locking/lockdep.c:2284) 
[2413.326349][T24687] ? 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) 
[2413.326544][T24687] ? 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) 
[2413.326673][T24687] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[2413.326820][T24687] ? __lock_release (kernel/locking/lockdep.c:5527) 
[2413.326950][T24687] __sys_sendmsg (net/socket.c:2649) 
[2413.327153][T24687] ? __pfx___sys_sendmsg (net/socket.c:2634) 
[2413.327287][T24687] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[2413.327419][T24687] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[2413.327551][T24687] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 2413.327783][T24687] RIP: 0033:0x7f9b0e5269a7
[ 2413.327930][T24687] 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)
[ 2413.328457][T24687] RSP: 002b:00007ffecdf60ee8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 2413.328649][T24687] RAX: ffffffffffffffda RBX: 00007ffecdf61a40 RCX: 00007f9b0e5269a7
[ 2413.328908][T24687] RDX: 0000000000000000 RSI: 00007ffecdf60f50 RDI: 0000000000000005
[ 2413.329103][T24687] RBP: 00007ffecdf61410 R08: 0000000004806910 R09: 0000000000000000
[ 2413.329294][T24687] R10: 00007f9b0e3df708 R11: 0000000000000246 R12: 0000000004806918


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