general protection fault, probably for non-canonical address 0xdffffc000000006b: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000358-0x000000000000035f]
CPU: 1 PID: 10674 Comm: syz.7.1869 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:ip_ignore_linkdown include/linux/inetdevice.h:254 [inline]
RIP: 0010:fib_lookup_good_nhc+0x81/0x3d0 net/ipv4/fib_trie.c:1407
Code: 4c 89 24 24 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 8f 58 51 f9 41 bc 58 03 00 00 4c 03 23 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 70 58 51 f9 4d 8b 24 24 e8 47 19
RSP: 0018:ffffc900033bf390 EFLAGS: 00010202
RAX: 000000000000006b RBX: ffff88804881c920 RCX: ffff888022378000
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88804881c92f R08: dffffc0000000000 R09: ffffc900033bf5c0
R10: fffff52000677ebe R11: 1ffff92000677eb8 R12: 0000000000000358
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff11009103925
FS:  00007fa491dc86c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3241bff8 CR3: 0000000061123000 CR4: 00000000003506e0
DR0: 000000000000004b DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 nexthop_get_nhc_lookup+0x1a8/0x400 include/net/nexthop.h:405
 fib_table_lookup+0xe76/0x15e0 net/ipv4/fib_trie.c:1583
 __inet_dev_addr_type+0x28b/0x430 net/ipv4/fib_frontend.c:224
 rds_tcp_laddr_check+0xd8/0x2f0 net/rds/tcp.c:325
 rds_trans_get_preferred+0x225/0x3a0 net/rds/transport.c:104
 __rds_conn_create+0x9e5/0x1e90 net/rds/connection.c:239
 rds_conn_create_outgoing+0x3f/0x50 net/rds/connection.c:363
 rds_sendmsg+0xfcc/0x1de0 net/rds/send.c:1295
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2436
 ___sys_sendmsg+0x1f0/0x260 net/socket.c:2490
 __sys_sendmsg net/socket.c:2519 [inline]
 __do_sys_sendmsg net/socket.c:2528 [inline]
 __se_sys_sendmsg+0x190/0x250 net/socket.c:2526
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fa493b60ec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa491dc8038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fa493db7fa0 RCX: 00007fa493b60ec9
RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000000000000006
RBP: 00007fa493be3f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa493db8038 R14: 00007fa493db7fa0 R15: 00007fff9e9daca8
 </TASK>
Modules linked in:
---[ end trace 7cc10b590b8fec99 ]---
RIP: 0010:ip_ignore_linkdown include/linux/inetdevice.h:254 [inline]
RIP: 0010:fib_lookup_good_nhc+0x81/0x3d0 net/ipv4/fib_trie.c:1407
Code: 4c 89 24 24 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 8f 58 51 f9 41 bc 58 03 00 00 4c 03 23 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 70 58 51 f9 4d 8b 24 24 e8 47 19
RSP: 0018:ffffc900033bf390 EFLAGS: 00010202
RAX: 000000000000006b RBX: ffff88804881c920 RCX: ffff888022378000
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88804881c92f R08: dffffc0000000000 R09: ffffc900033bf5c0
R10: fffff52000677ebe R11: 1ffff92000677eb8 R12: 0000000000000358
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff11009103925
FS:  00007fa491dc86c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8ce3239358 CR3: 0000000061123000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
   0:	4c 89 24 24          	mov    %r12,(%rsp)
   4:	48 89 d8             	mov    %rbx,%rax
   7:	48 c1 e8 03          	shr    $0x3,%rax
   b:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
  10:	74 08                	je     0x1a
  12:	48 89 df             	mov    %rbx,%rdi
  15:	e8 8f 58 51 f9       	call   0xf95158a9
  1a:	41 bc 58 03 00 00    	mov    $0x358,%r12d
  20:	4c 03 23             	add    (%rbx),%r12
  23:	4c 89 e0             	mov    %r12,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 e7             	mov    %r12,%rdi
  34:	e8 70 58 51 f9       	call   0xf95158a9
  39:	4d 8b 24 24          	mov    (%r12),%r12
  3d:	e8                   	.byte 0xe8
  3e:	47                   	rex.RXB
  3f:	19                   	.byte 0x19