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: 3490 Comm: kworker/u8:11 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: krdsd rds_connect_worker
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+0x1355/0x23e0 net/ipv4/route.c:2875
Code: 31 ff 89 c6 e8 5c 3f fc f7 45 85 ff 74 50 e8 12 3b fc f7 eb 05 e8 0b 3b fc f7 4d 85 f6 74 38 4d 8d 7e 3a 4c 89 f8 48 c1 e8 03 <0f> b6 04 28 84 c0 0f 85 aa 0e 00 00 45 0f b7 3f bf ff ff 00 00 44
RSP: 0018:ffffc9000bdef3a8 EFLAGS: 00010202
RAX: 0000000000000007 RBX: 0000000080000000 RCX: ffff888031b38000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffff888031b38000 R09: 0000000000000003
R10: 0000000000000005 R11: 0000000000000000 R12: ffff888053c9c5db
R13: 0000000000000000 R14: ffffffffffffffff R15: 0000000000000039
FS:  0000000000000000(0000) GS:ffff888125d0c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffeaf9313e8 CR3: 000000006eae4000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ip_route_output_key_hash+0x174/0x280 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
 ip_route_connect include/net/route.h:355 [inline]
 tcp_v4_connect+0x818/0x1a90 net/ipv4/tcp_ipv4.c:256
 __inet_stream_connect+0x2ae/0xe70 net/ipv4/af_inet.c:679
 inet_stream_connect+0x66/0xa0 net/ipv4/af_inet.c:750
 kernel_connect+0x116/0x180 net/socket.c:3652
 rds_tcp_conn_path_connect+0x512/0x680 net/rds/tcp_connect.c:176
 rds_connect_worker+0x1d8/0x290 net/rds/threads.c:176
 process_one_work+0x93a/0x15a0 kernel/workqueue.c:3279
 process_scheduled_works kernel/workqueue.c:3362 [inline]
 worker_thread+0x9b0/0xee0 kernel/workqueue.c:3443
 kthread+0x389/0x480 kernel/kthread.c:467
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </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+0x1355/0x23e0 net/ipv4/route.c:2875
Code: 31 ff 89 c6 e8 5c 3f fc f7 45 85 ff 74 50 e8 12 3b fc f7 eb 05 e8 0b 3b fc f7 4d 85 f6 74 38 4d 8d 7e 3a 4c 89 f8 48 c1 e8 03 <0f> b6 04 28 84 c0 0f 85 aa 0e 00 00 45 0f b7 3f bf ff ff 00 00 44
RSP: 0018:ffffc9000bdef3a8 EFLAGS: 00010202
RAX: 0000000000000007 RBX: 0000000080000000 RCX: ffff888031b38000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffff888031b38000 R09: 0000000000000003
R10: 0000000000000005 R11: 0000000000000000 R12: ffff888053c9c5db
R13: 0000000000000000 R14: ffffffffffffffff R15: 0000000000000039
FS:  0000000000000000(0000) GS:ffff888125d0c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000039f030 CR3: 000000007c4fc000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	31 ff                	xor    %edi,%edi
   2:	89 c6                	mov    %eax,%esi
   4:	e8 5c 3f fc f7       	call   0xf7fc3f65
   9:	45 85 ff             	test   %r15d,%r15d
   c:	74 50                	je     0x5e
   e:	e8 12 3b fc f7       	call   0xf7fc3b25
  13:	eb 05                	jmp    0x1a
  15:	e8 0b 3b fc f7       	call   0xf7fc3b25
  1a:	4d 85 f6             	test   %r14,%r14
  1d:	74 38                	je     0x57
  1f:	4d 8d 7e 3a          	lea    0x3a(%r14),%r15
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	0f b6 04 28          	movzbl (%rax,%rbp,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 aa 0e 00 00    	jne    0xee0
  36:	45 0f b7 3f          	movzwl (%r15),%r15d
  3a:	bf ff ff 00 00       	mov    $0xffff,%edi
  3f:	44                   	rex.R