======================================
| [   25.924584][  T383] ==================================================================
| [ 25.924834][ T383] 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) 
| [   25.925050][  T383] Read of size 4 at addr 0000000000000068 by task ip/383
| [   25.925222][  T383]
[   25.925298][  T383] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   25.925300][  T383] Call Trace:
[   25.925302][  T383]  <TASK>
[ 25.925304][ T383] dump_stack_lvl (lib/dump_stack.c:123) 
[ 25.925310][ T383] kasan_report (mm/kasan/report.c:636) 
[ 25.925316][ T383] ? 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) 
[ 25.925321][ T383] kasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189) 
[ 25.925325][ T383] 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) 
[ 25.925331][ T383] ? __pfx_nexthop_create_group (net/ipv4/nexthop.c:2686) 
[ 25.925334][ T383] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 25.925341][ T383] rtm_new_nexthop (net/ipv4/nexthop.c:2937 net/ipv4/nexthop.c:3254) 
[ 25.925345][ T383] ? 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) 
[ 25.925349][ T383] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 25.925353][ T383] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 25.925365][ T383] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6952) 
[ 25.925373][ T383] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 25.925378][ T383] rtnetlink_rcv_msg (net/core/rtnetlink.c:6954) 
[ 25.925384][ T383] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 25.925389][ T383] ? 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) 
[ 25.925393][ T383] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 25.925398][ T383] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 25.925402][ T383] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 25.925407][ T383] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 25.925412][ T383] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 25.925419][ T383] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 25.925422][ T383] ? 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) 
[ 25.925426][ T383] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 25.925430][ T383] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 25.925433][ T383] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 25.925437][ T383] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 25.925441][ T383] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 25.925447][ T383] ____sys_sendmsg (net/socket.c:709 net/socket.c:724 net/socket.c:2563) 
[ 25.925453][ T383] ? __pfx_____sys_sendmsg (net/socket.c:2509) 
[ 25.925457][ T383] ? __pfx_copy_msghdr_from_user (net/socket.c:2489) 
[ 25.925463][ T383] ___sys_sendmsg (net/socket.c:2619) 
[ 25.925466][ T383] ? 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) 
[ 25.925469][ T383] ? __pfx____sys_sendmsg (net/socket.c:2606) 
[ 25.925473][ T383] ? hlock_class (kernel/locking/lockdep.c:225) 
[ 25.925478][ T383] ? 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) 
[ 25.925482][ T383] ? 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) 
[ 25.925487][ T383] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 25.925490][ T383] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 25.925494][ T383] __sys_sendmsg (net/socket.c:2649) 
[ 25.925497][ T383] ? __pfx___sys_sendmsg (net/socket.c:2634) 
[ 25.925503][ T383] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 25.925508][ T383] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 25.925513][ T383] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   25.925518][  T383] RIP: 0033:0x7f7f43f319a7
[ 25.925521][ T383] 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)
[   25.925524][  T383] RSP: 002b:00007ffe572d9578 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   25.925528][  T383] RAX: ffffffffffffffda RBX: 00007ffe572da0d0 RCX: 00007f7f43f319a7
[   25.925531][  T383] RDX: 0000000000000000 RSI: 00007ffe572d95e0 RDI: 0000000000000005
[   25.925532][  T383] RBP: 00007ffe572d9aa0 R08: 000000000fd3d910 R09: 0000000000000000
[   25.925534][  T383] R10: 00007f7f43dea708 R11: 0000000000000246 R12: 000000000fd3d918
[   25.925536][  T383] R13: 0000000067da38b4 R14: 0000000000498600 R15: 000000000fd3d910
| [   25.933892][  T383] Disabling lock debugging due to kernel taint
| [   25.934077][  T383] Oops: general protection fault, probably for non-canonical address 0xdffffc000000000d: 0000 [#1] PREEMPT SMP KASAN NOPTI
| [   25.934415][  T383] KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]
| [   25.934850][  T383] Tainted: [B]=BAD_PAGE
[   25.934966][  T383] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 25.935140][ T383] 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) 
[ 25.935321][ T383] 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
[   25.935784][  T383] RSP: 0018:ffffc90000b773c8 EFLAGS: 00010202
[   25.935947][  T383] RAX: 000000000000000d RBX: ffff888002387168 RCX: ffffffffaa653d8a
[   25.936149][  T383] RDX: fffffbfff5f22491 RSI: 0000000000000008 RDI: ffffffffaf912480
[   25.936355][  T383] RBP: 0000000000000000 R08: 0000000000000001 R09: fffffbfff5f22490
[   25.936561][  T383] R10: ffffffffaf912487 R11: 205d333833542020 R12: dffffc0000000000
[   25.936761][  T383] R13: ffff888009064640 R14: 0000000000000000 R15: 0000000000000068
[   25.936963][  T383] FS:  00007f7f43d25800(0000) GS:ffff88802f480000(0000) knlGS:0000000000000000
[   25.937201][  T383] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   25.937382][  T383] CR2: 00007f7f43f81423 CR3: 000000000de48001 CR4: 0000000000772ef0
[   25.937577][  T383] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   25.937771][  T383] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   25.937976][  T383] PKRU: 55555554
[   25.938076][  T383] Call Trace:
[   25.938174][  T383]  <TASK>
[ 25.938244][ T383] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) 
[ 25.938350][ T383] ? exc_general_protection (arch/x86/kernel/traps.c:751 arch/x86/kernel/traps.c:693) 
[ 25.938486][ T383] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617) 
[ 25.938629][ T383] ? add_taint (./arch/x86/include/asm/bitops.h:60 ./include/asm-generic/bitops/instrumented-atomic.h:29 kernel/panic.c:605) 
[ 25.938729][ T383] ? 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) 
[ 25.938863][ T383] ? 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) 
[ 25.938995][ T383] ? __pfx_nexthop_create_group (net/ipv4/nexthop.c:2686) 
[ 25.939124][ T383] ? __nla_validate_parse (lib/nlattr.c:638) 
[ 25.939266][ T383] rtm_new_nexthop (net/ipv4/nexthop.c:2937 net/ipv4/nexthop.c:3254) 
[ 25.939400][ T383] ? 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) 
[ 25.939528][ T383] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 25.939629][ T383] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 25.939773][ T383] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6952) 
[ 25.939915][ T383] ? __pfx_rtm_new_nexthop (net/ipv4/nexthop.c:3225) 
[ 25.940044][ T383] rtnetlink_rcv_msg (net/core/rtnetlink.c:6954) 
[ 25.940174][ T383] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 25.940304][ T383] ? 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) 
[ 25.940434][ T383] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 25.940533][ T383] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 25.940680][ T383] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 25.940809][ T383] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 25.940939][ T383] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 25.941075][ T383] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 25.941207][ T383] ? 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) 
[ 25.941346][ T383] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 25.941476][ T383] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 25.941608][ T383] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 25.941748][ T383] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 25.941881][ T383] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 25.942013][ T383] ____sys_sendmsg (net/socket.c:709 net/socket.c:724 net/socket.c:2563) 
[ 25.942150][ T383] ? __pfx_____sys_sendmsg (net/socket.c:2509) 
[ 25.942281][ T383] ? __pfx_copy_msghdr_from_user (net/socket.c:2489) 
[ 25.942444][ T383] ___sys_sendmsg (net/socket.c:2619) 
[ 25.942595][ T383] ? 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) 
[ 25.942725][ T383] ? __pfx____sys_sendmsg (net/socket.c:2606) 
[ 25.942855][ T383] ? hlock_class (kernel/locking/lockdep.c:225) 
[ 25.942984][ T383] ? 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) 
[ 25.943115][ T383] ? 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) 
[ 25.943245][ T383] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 25.943373][ T383] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 25.943511][ T383] __sys_sendmsg (net/socket.c:2649) 
[ 25.943640][ T383] ? __pfx___sys_sendmsg (net/socket.c:2634) 
[ 25.943770][ T383] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1339) 
[ 25.943898][ T383] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 25.944028][ T383] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   25.944188][  T383] RIP: 0033:0x7f7f43f319a7
[ 25.944322][ T383] 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)
[   25.944794][  T383] RSP: 002b:00007ffe572d9578 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   25.944994][  T383] RAX: ffffffffffffffda RBX: 00007ffe572da0d0 RCX: 00007f7f43f319a7
[   25.945186][  T383] RDX: 0000000000000000 RSI: 00007ffe572d95e0 RDI: 0000000000000005
[   25.945384][  T383] RBP: 00007ffe572d9aa0 R08: 000000000fd3d910 R09: 0000000000000000
[   25.945580][  T383] R10: 00007f7f43dea708 R11: 0000000000000246 R12: 000000000fd3d918


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