Oops: general protection fault, probably for non-canonical address 0xdffffc0000000083: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000418-0x000000000000041f] CPU: 1 UID: 0 PID: 20445 Comm: syz.2.4360 Not tainted 6.17.0-rc1-syzkaller-00004-g53e760d89498 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:ip_ignore_linkdown include/linux/inetdevice.h:270 [inline] RIP: 0010:fib_lookup_good_nhc+0xaf/0x3f0 net/ipv4/fib_trie.c:1408 Code: df 48 c1 ea 03 80 3c 02 00 0f 85 1e 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 2b 48 8d bd 18 04 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 ef 02 00 00 4c 8b bd 18 04 00 00 e8 4b 5d 7b 01 RSP: 0018:ffffc9000b74f6a0 EFLAGS: 00010212 RAX: dffffc0000000000 RBX: ffff888146f37220 RCX: ffffc90017f07000 RDX: 0000000000000083 RSI: ffffffff8a1613c9 RDI: 0000000000000418 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000b74fa30 R13: ffff888146f37237 R14: 0000000000000001 R15: ffff88802f586b18 FS: 00007f4cc7ff66c0(0000) GS:ffff8881247c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3738cb CR3: 0000000075f87000 CR4: 0000000000350ef0 Call Trace: nexthop_get_nhc_lookup include/net/nexthop.h:437 [inline] fib_table_lookup+0x158e/0x2300 net/ipv4/fib_trie.c:1584 fib_lookup.constprop.0+0x13e/0x530 include/net/ip_fib.h:390 ip_route_output_key_hash_rcu+0xde8/0x28c0 net/ipv4/route.c:2805 ip_route_output_key_hash+0x137/0x2e0 net/ipv4/route.c:2696 __ip_route_output_key include/net/route.h:169 [inline] ip_route_output_flow+0x27/0x150 net/ipv4/route.c:2923 ip_route_output_key include/net/route.h:179 [inline] sctp_v4_get_dst+0x3cf/0x1220 net/sctp/protocol.c:454 sctp_transport_route+0x132/0x350 net/sctp/transport.c:457 sctp_assoc_add_peer+0x741/0x1550 net/sctp/associola.c:663 sctp_connect_new_asoc+0x1f8/0x770 net/sctp/socket.c:1100 __sctp_connect+0x3f3/0xc60 net/sctp/socket.c:1198 sctp_connect net/sctp/socket.c:4820 [inline] sctp_inet_connect+0x15f/0x200 net/sctp/socket.c:4835 __sys_connect_file+0x141/0x1a0 net/socket.c:2086 __sys_connect+0x13b/0x160 net/socket.c:2105 __do_sys_connect net/socket.c:2111 [inline] __se_sys_connect net/socket.c:2108 [inline] __x64_sys_connect+0x72/0xb0 net/socket.c:2108 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4cc9d8ebe9 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:00007f4cc7ff6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007f4cc9fb6180 RCX: 00007f4cc9d8ebe9 RDX: 0000000000000010 RSI: 0000200000004cc0 RDI: 0000000000000006 RBP: 00007f4cc9e11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4cc9fb6218 R14: 00007f4cc9fb6180 R15: 00007ffc7227cef8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ip_ignore_linkdown include/linux/inetdevice.h:270 [inline] RIP: 0010:fib_lookup_good_nhc+0xaf/0x3f0 net/ipv4/fib_trie.c:1408 Code: df 48 c1 ea 03 80 3c 02 00 0f 85 1e 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 2b 48 8d bd 18 04 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 ef 02 00 00 4c 8b bd 18 04 00 00 e8 4b 5d 7b 01 RSP: 0018:ffffc9000b74f6a0 EFLAGS: 00010212 RAX: dffffc0000000000 RBX: ffff888146f37220 RCX: ffffc90017f07000 RDX: 0000000000000083 RSI: ffffffff8a1613c9 RDI: 0000000000000418 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000b74fa30 R13: ffff888146f37237 R14: 0000000000000001 R15: ffff88802f586b18 FS: 00007f4cc7ff66c0(0000) GS:ffff8881246c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000015030 CR3: 0000000075f87000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 48 c1 ea 03 shr $0x3,%rdx 4: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 8: 0f 85 1e 03 00 00 jne 0x32c e: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 15: fc ff df 18: 48 8b 2b mov (%rbx),%rbp 1b: 48 8d bd 18 04 00 00 lea 0x418(%rbp),%rdi 22: 48 89 fa mov %rdi,%rdx 25: 48 c1 ea 03 shr $0x3,%rdx * 29: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2d: 0f 85 ef 02 00 00 jne 0x322 33: 4c 8b bd 18 04 00 00 mov 0x418(%rbp),%r15 3a: e8 4b 5d 7b 01 call 0x17b5d8a