Oops: general protection fault, probably for non-canonical address 0xdffffc0000000007: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]
CPU: 1 UID: 0 PID: 27759 Comm: syz.4.5411 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:rt_cache_valid net/ipv4/route.c:1582 [inline]
RIP: 0010:__mkroute_output net/ipv4/route.c:2650 [inline]
RIP: 0010:ip_route_output_key_hash_rcu+0x12ba/0x25d0 net/ipv4/route.c:2875
Code: c3 31 ff 89 c6 e8 b6 9b c7 f7 85 db 74 5b e8 6d 97 c7 f7 eb 05 e8 66 97 c7 f7 4d 85 ff 74 36 49 8d 5f 3a 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 ff 10 00 00 0f b7 1b bf ff ff 00 00 89
RSP: 0018:ffffc9000428f0c0 EFLAGS: 00010202
RAX: 0000000000000007 RBX: 0000000000000039 RCX: ffff888030ed8000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000080000000 R08: ffff888030ed8000 R09: 0000000000000003
R10: 0000000000000005 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff888035baa358 R15: ffffffffffffffff
FS:  00007f46035c16c0(0000) GS:ffff8881255b0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f64549ad2c0 CR3: 0000000079940000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ip_route_output_key_hash+0x18d/0x2a0 net/ipv4/route.c:2705
 __ip_route_output_key include/net/route.h:169 [inline]
 ip_route_output_flow+0x2a/0x150 net/ipv4/route.c:2932
 udp_sendmsg+0x154a/0x22f0 net/ipv4/udp.c:1451
 udpv6_sendmsg+0xd1c/0x2560 net/ipv6/udp.c:1545
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 ____sys_sendmsg+0x62c/0xad0 net/socket.c:2592
 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646
 __sys_sendmmsg+0x27c/0x4e0 net/socket.c:2735
 __do_sys_sendmmsg net/socket.c:2762 [inline]
 __se_sys_sendmmsg net/socket.c:2759 [inline]
 __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2759
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f460279c629
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f46035c1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f4602a16180 RCX: 00007f460279c629
RDX: 0000000000000002 RSI: 00002000000018c0 RDI: 0000000000000003
RBP: 00007f4602832b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000004880 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4602a16218 R14: 00007f4602a16180 R15: 00007ffd670a4748
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:rt_cache_valid net/ipv4/route.c:1582 [inline]
RIP: 0010:__mkroute_output net/ipv4/route.c:2650 [inline]
RIP: 0010:ip_route_output_key_hash_rcu+0x12ba/0x25d0 net/ipv4/route.c:2875
Code: c3 31 ff 89 c6 e8 b6 9b c7 f7 85 db 74 5b e8 6d 97 c7 f7 eb 05 e8 66 97 c7 f7 4d 85 ff 74 36 49 8d 5f 3a 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 ff 10 00 00 0f b7 1b bf ff ff 00 00 89
RSP: 0018:ffffc9000428f0c0 EFLAGS: 00010202
RAX: 0000000000000007 RBX: 0000000000000039 RCX: ffff888030ed8000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000080000000 R08: ffff888030ed8000 R09: 0000000000000003
R10: 0000000000000005 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff888035baa358 R15: ffffffffffffffff
FS:  00007f46035c16c0(0000) GS:ffff8881254b0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe21e017dac CR3: 0000000079940000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	c3                   	ret
   1:	31 ff                	xor    %edi,%edi
   3:	89 c6                	mov    %eax,%esi
   5:	e8 b6 9b c7 f7       	call   0xf7c79bc0
   a:	85 db                	test   %ebx,%ebx
   c:	74 5b                	je     0x69
   e:	e8 6d 97 c7 f7       	call   0xf7c79780
  13:	eb 05                	jmp    0x1a
  15:	e8 66 97 c7 f7       	call   0xf7c79780
  1a:	4d 85 ff             	test   %r15,%r15
  1d:	74 36                	je     0x55
  1f:	49 8d 5f 3a          	lea    0x3a(%r15),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 ff 10 00 00    	jne    0x1136
  37:	0f b7 1b             	movzwl (%rbx),%ebx
  3a:	bf ff ff 00 00       	mov    $0xffff,%edi
  3f:	89                   	.byte 0x89