Hello, syzbot found the following issue on: HEAD commit: 950fe35831af Merge branch 'ipv6-expired-routes' git tree: net-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=13158a4ba80000 kernel config: https://syzkaller.appspot.com/x/.config?x=fe63ad15dded26b6 dashboard link: https://syzkaller.appspot.com/bug?extid=5ba06978f34abb058571 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11be0117a80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14950727a80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/d3d4f3ce986f/disk-950fe358.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d5afd9c7f284/vmlinux-950fe358.xz kernel image: https://storage.googleapis.com/syzbot-assets/1a203c65f0ae/bzImage-950fe358.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5ba06978f34abb058571@xxxxxxxxxxxxxxxxxxxxxxxxx netlink: 24 bytes leftover after parsing attributes in process `syz-executor252'. ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5027 at net/core/dev.c:9593 dev_index_reserve+0x1a2/0x1c0 net/core/dev.c:9593 Modules linked in: CPU: 0 PID: 5027 Comm: syz-executor252 Not tainted 6.5.0-rc5-syzkaller-01605-g950fe35831af #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 RIP: 0010:dev_index_reserve+0x1a2/0x1c0 net/core/dev.c:9593 Code: 00 31 d2 4d 8d 45 50 b9 ff ff ff 7f 48 8d 74 24 20 e8 f2 05 02 02 4c 89 e7 89 c3 e8 48 01 11 02 e9 48 ff ff ff e8 5e 1a 5e f9 <0f> 0b bb ea ff ff ff e9 52 ff ff ff e8 cd 4f 0d 02 66 66 2e 0f 1f RSP: 0018:ffffc90003a2efa8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 00000000ffffffff RCX: 0000000000000000 RDX: ffff88807d940000 RSI: ffffffff88280632 RDI: 0000000000000005 RBP: 1ffff92000745df5 R08: 0000000000000005 R09: 0000000000000000 R10: 00000000ffffffff R11: ffffffff8a40008b R12: ffff88823bd20010 R13: ffffffff924d1180 R14: ffff88823bd20000 R15: ffff88823bd200f8 FS: 00005555573a0380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055feb9a33020 CR3: 000000001eaea000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> register_netdevice+0x69a/0x1490 net/core/dev.c:10081 veth_newlink+0x521/0xa50 drivers/net/veth.c:1938 rtnl_newlink_create net/core/rtnetlink.c:3471 [inline] __rtnl_newlink+0x115e/0x18c0 net/core/rtnetlink.c:3688 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3701 rtnetlink_rcv_msg+0x439/0xd30 net/core/rtnetlink.c:6427 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2545 netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline] netlink_unicast+0x536/0x810 net/netlink/af_netlink.c:1368 netlink_sendmsg+0x93c/0xe40 net/netlink/af_netlink.c:1910 sock_sendmsg_nosec net/socket.c:728 [inline] sock_sendmsg+0xd9/0x180 net/socket.c:751 ____sys_sendmsg+0x6ac/0x940 net/socket.c:2514 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2568 __sys_sendmsg+0x117/0x1e0 net/socket.c:2597 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7ff9080bb329 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc3ff5b078 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ffc3ff5b248 RCX: 00007ff9080bb329 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000003 RBP: 00007ff90812e610 R08: 0000000000000000 R09: 00007ffc3ff5b248 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffc3ff5b238 R14: 0000000000000001 R15: 0000000000000001 </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
