9pnet_fd: Insufficient options for proto=fd netlink: 40 bytes leftover after parsing attributes in process `syz.5.330'. ================================================================== BUG: KCSAN: data-race in ip_vs_add_service / ip_vs_out_hook write to 0xffff888118ad3804 of 4 bytes by task 4702 on cpu 1: ip_vs_add_service+0xa18/0xa70 net/netfilter/ipvs/ip_vs_ctl.c:1487 do_ip_vs_set_ctl+0x6ec/0x8c0 net/netfilter/ipvs/ip_vs_ctl.c:2807 nf_setsockopt+0x196/0x1b0 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0x102/0x110 net/ipv4/ip_sockglue.c:1424 udp_setsockopt+0x99/0xb0 net/ipv4/udp.c:3058 sock_common_setsockopt+0x66/0x80 net/core/sock.c:3894 do_sock_setsockopt net/socket.c:2296 [inline] __sys_setsockopt+0x181/0x200 net/socket.c:2321 __do_sys_setsockopt net/socket.c:2327 [inline] __se_sys_setsockopt net/socket.c:2324 [inline] __x64_sys_setsockopt+0x64/0x80 net/socket.c:2324 x64_sys_call+0x2bd5/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:55 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff888118ad3804 of 4 bytes by task 4700 on cpu 0: ip_vs_out_hook+0x1c1/0x920 net/netfilter/ipvs/ip_vs_core.c:1356 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_slow+0x75/0x180 net/netfilter/core.c:626 nf_hook include/linux/netfilter.h:269 [inline] __ip_local_out+0x2cb/0x2f0 net/ipv4/ip_output.c:118 ip_local_out net/ipv4/ip_output.c:127 [inline] ip_send_skb+0x32/0x140 net/ipv4/ip_output.c:1501 udp_send_skb+0x6e3/0xa40 net/ipv4/udp.c:1195 udp_sendmsg+0x1044/0x13a0 net/ipv4/udp.c:1483 inet_sendmsg+0xac/0xd0 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x102/0x180 net/socket.c:727 ____sys_sendmsg+0x345/0x4e0 net/socket.c:2566 ___sys_sendmsg+0x17b/0x1d0 net/socket.c:2620 __sys_sendmmsg+0x178/0x300 net/socket.c:2709 __do_sys_sendmmsg net/socket.c:2736 [inline] __se_sys_sendmmsg net/socket.c:2733 [inline] __x64_sys_sendmmsg+0x57/0x70 net/socket.c:2733 x64_sys_call+0x2f2f/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:308 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000 -> 0x00000001 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 4700 Comm: syz.5.330 Not tainted 6.15.0-rc4-syzkaller-00011-gf15d97df5afa #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 ================================================================== IPVS: ovf: UDP 224.0.0.2:0 - no destination available