======================================
| [   25.547920][  T385] ==================================================================
| [ 25.548327][ T385] 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) 
| [   25.548677][  T385] Read of size 4 at addr 0000000000000068 by task ip/385
| [   25.548949][  T385]
[   25.549084][  T385] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   25.549087][  T385] Call Trace:
[   25.549090][  T385]  <TASK>
[ 25.549093][ T385] dump_stack_lvl (lib/dump_stack.c:123) 
[ 25.549104][ T385] kasan_report (mm/kasan/report.c:636) 
[ 25.549113][ T385] ? 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) 
[ 25.549123][ T385] kasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189) 
[ 25.549130][ T385] 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) 
[ 25.549141][ T385] ? __pfx_nexthop_create_group (net/ipv4/nexthop.c:2686) 
[ 25.549146][ T385] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 25.549157][ T385] rtm_new_nexthop (net/ipv4/nexthop.c:2937 net/ipv4/nexthop.c:3254) 
[ 25.549165][ T385] ? 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) 
[ 25.549172][ T385] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 25.549178][ T385] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 25.549200][ T385] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6952) 
[ 25.549209][ T385] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 25.549215][ T385] rtnetlink_rcv_msg (net/core/rtnetlink.c:6954) 
[ 25.549223][ T385] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 25.549230][ T385] ? 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) 
[ 25.549235][ T385] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 25.549244][ T385] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 25.549252][ T385] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 25.549260][ T385] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 25.549268][ T385] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 25.549283][ T385] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 25.549290][ T385] ? 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) 
[ 25.549297][ T385] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 25.549304][ T385] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 25.549309][ T385] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 25.549317][ T385] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 25.549324][ T385] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 25.549336][ T385] ____sys_sendmsg (net/socket.c:709 net/socket.c:724 net/socket.c:2563) 
[ 25.549347][ T385] ? __pfx_____sys_sendmsg (net/socket.c:2509) 
[ 25.549352][ T385] ? __pfx_copy_msghdr_from_user (net/socket.c:2489) 
[ 25.549365][ T385] ___sys_sendmsg (net/socket.c:2619) 
[ 25.549372][ T385] ? __pfx____sys_sendmsg (net/socket.c:2606) 
[ 25.549376][ T385] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 25.549382][ T385] ? __pfx_handle_pte_fault (mm/memory.c:5864) 
[ 25.549394][ T385] ? __handle_mm_fault (mm/memory.c:6050) 
[ 25.549399][ T385] ? __pfx___handle_mm_fault (mm/memory.c:5959) 
[ 25.549404][ T385] ? mt_find (lib/maple_tree.c:6909) 
[ 25.549415][ T385] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 25.549421][ T385] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 25.549426][ T385] ? do_user_addr_fault (./include/linux/mmap_lock.h:218 arch/x86/mm/fault.c:1416) 
[ 25.549437][ T385] __sys_sendmsg (net/socket.c:2649) 
[ 25.549442][ T385] ? __pfx___sys_sendmsg (net/socket.c:2634) 
[ 25.549452][ T385] ? do_user_addr_fault (./include/linux/mmap_lock.h:218 arch/x86/mm/fault.c:1416) 
[ 25.549461][ T385] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 25.549470][ T385] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   25.549478][  T385] RIP: 0033:0x7f49da5ca9a7
[ 25.549485][ T385] 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)
[   25.549499][  T385] RSP: 002b:00007ffd00df40c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   25.549506][  T385] RAX: ffffffffffffffda RBX: 00007ffd00df4c50 RCX: 00007f49da5ca9a7
[   25.549509][  T385] RDX: 0000000000000000 RSI: 00007ffd00df4130 RDI: 0000000000000005
[   25.549513][  T385] RBP: 00007ffd00df45f0 R08: 0000000000000002 R09: 0000000000000000
[   25.549515][  T385] R10: 00007f49da483708 R11: 0000000000000246 R12: 0000000000000001
[   25.549518][  T385] R13: 0000000067da60b1 R14: 0000000000498600 R15: 00007ffd00df6992
| [   25.562871][  T385] Disabling lock debugging due to kernel taint
| [   25.563077][  T385] Oops: general protection fault, probably for non-canonical address 0xdffffc000000000d: 0000 [#1] PREEMPT SMP KASAN NOPTI
| [   25.563466][  T385] KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]
| [   25.563963][  T385] Tainted: [B]=BAD_PAGE
[   25.564076][  T385] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 25.564273][ T385] 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) 
[ 25.564488][ T385] 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
[   25.565002][  T385] RSP: 0018:ffffc90000a973c8 EFLAGS: 00010202
[   25.565193][  T385] RAX: 000000000000000d RBX: ffff8880058cf4e8 RCX: ffffffff9d253d8a
[   25.565414][  T385] RDX: fffffbfff44a2491 RSI: 0000000000000008 RDI: ffffffffa2512480
[   25.565634][  T385] RBP: 0000000000000000 R08: 0000000000000001 R09: fffffbfff44a2490
[   25.565859][  T385] R10: ffffffffa2512487 R11: 205d353833542020 R12: dffffc0000000000
[   25.566079][  T385] R13: ffff88801146b0c0 R14: 0000000000000000 R15: 0000000000000068
[   25.566307][  T385] FS:  00007f49da3be800(0000) GS:ffff888036180000(0000) knlGS:0000000000000000
[   25.566568][  T385] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   25.566755][  T385] CR2: 00007f49da619ac0 CR3: 0000000012882005 CR4: 0000000000772ef0
[   25.566977][  T385] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   25.567196][  T385] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   25.567418][  T385] PKRU: 55555554
[   25.567530][  T385] Call Trace:
[   25.567648][  T385]  <TASK>
[ 25.567725][ T385] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) 
[ 25.567847][ T385] ? exc_general_protection (arch/x86/kernel/traps.c:751 arch/x86/kernel/traps.c:693) 
[ 25.568005][ T385] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617) 
[ 25.568157][ T385] ? add_taint (./arch/x86/include/asm/bitops.h:60 ./include/asm-generic/bitops/instrumented-atomic.h:29 kernel/panic.c:605) 
[ 25.568273][ T385] ? 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) 
[ 25.568421][ T385] ? 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) 
[ 25.568570][ T385] ? __pfx_nexthop_create_group (net/ipv4/nexthop.c:2686) 
[ 25.568716][ T385] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 25.568865][ T385] rtm_new_nexthop (net/ipv4/nexthop.c:2937 net/ipv4/nexthop.c:3254) 
[ 25.569019][ T385] ? 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) 
[ 25.569180][ T385] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 25.569297][ T385] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 25.569457][ T385] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6952) 
[ 25.569623][ T385] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 25.569773][ T385] rtnetlink_rcv_msg (net/core/rtnetlink.c:6954) 
[ 25.569926][ T385] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 25.570073][ T385] ? 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) 
[ 25.570233][ T385] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 25.570346][ T385] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 25.570502][ T385] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 25.570653][ T385] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 25.570808][ T385] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 25.570956][ T385] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 25.571107][ T385] ? 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) 
[ 25.571256][ T385] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 25.571410][ T385] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 25.571560][ T385] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 25.571709][ T385] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 25.571855][ T385] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 25.572002][ T385] ____sys_sendmsg (net/socket.c:709 net/socket.c:724 net/socket.c:2563) 
[ 25.572166][ T385] ? __pfx_____sys_sendmsg (net/socket.c:2509) 
[ 25.572317][ T385] ? __pfx_copy_msghdr_from_user (net/socket.c:2489) 
[ 25.572502][ T385] ___sys_sendmsg (net/socket.c:2619) 
[ 25.572653][ T385] ? __pfx____sys_sendmsg (net/socket.c:2606) 
[ 25.572815][ T385] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 25.572971][ T385] ? __pfx_handle_pte_fault (mm/memory.c:5864) 
[ 25.573125][ T385] ? __handle_mm_fault (mm/memory.c:6050) 
[ 25.573275][ T385] ? __pfx___handle_mm_fault (mm/memory.c:5959) 
[ 25.573421][ T385] ? mt_find (lib/maple_tree.c:6909) 
[ 25.573547][ T385] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 25.573696][ T385] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 25.573843][ T385] ? do_user_addr_fault (./include/linux/mmap_lock.h:218 arch/x86/mm/fault.c:1416) 
[ 25.573992][ T385] __sys_sendmsg (net/socket.c:2649) 
[ 25.574140][ T385] ? __pfx___sys_sendmsg (net/socket.c:2634) 
[ 25.574292][ T385] ? do_user_addr_fault (./include/linux/mmap_lock.h:218 arch/x86/mm/fault.c:1416) 
[ 25.574457][ T385] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 25.574606][ T385] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   25.574794][  T385] RIP: 0033:0x7f49da5ca9a7
[ 25.574961][ T385] 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)
[   25.575480][  T385] RSP: 002b:00007ffd00df40c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   25.575728][  T385] RAX: ffffffffffffffda RBX: 00007ffd00df4c50 RCX: 00007f49da5ca9a7
[   25.575958][  T385] RDX: 0000000000000000 RSI: 00007ffd00df4130 RDI: 0000000000000005
[   25.576177][  T385] RBP: 00007ffd00df45f0 R08: 0000000000000002 R09: 0000000000000000
[   25.576410][  T385] R10: 00007f49da483708 R11: 0000000000000246 R12: 0000000000000001


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