IPVS: Schedule: port zero only supported in persistent services, check your ipvs configuration
==================================================================
BUG: KCSAN: data-race in data_alloc / data_push_tail

write to 0xffffffff88bbb550 of 8 bytes by task 3517 on cpu 0:
 data_alloc+0x216/0x2c0 kernel/printk/printk_ringbuffer.c:1082
 prb_reserve+0x85e/0xb60 kernel/printk/printk_ringbuffer.c:1669
 vprintk_store+0x558/0x870 kernel/printk/printk.c:2326
 vprintk_emit+0x15e/0x680 kernel/printk/printk.c:2408
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2447
 vprintk+0x75/0x80 kernel/printk/printk_safe.c:86
 _printk+0x7a/0xa0 kernel/printk/printk.c:2457
 ip_vs_schedule+0xde2/0xeb0 net/netfilter/ipvs/ip_vs_core.c:518
 udp_conn_schedule+0x248/0x3b0 net/netfilter/ipvs/ip_vs_proto_udp.c:78
 ip_vs_try_to_schedule net/netfilter/ipvs/ip_vs_core.c:1482 [inline]
 ip_vs_in_hook+0x5d2/0x1210 net/netfilter/ipvs/ip_vs_core.c:2054
 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
 nf_hook_slow+0x86/0x1b0 net/netfilter/core.c:626
 nf_hook include/linux/netfilter.h:269 [inline]
 __ip_local_out+0x2d6/0x300 net/ipv4/ip_output.c:119
 ip_local_out+0x26/0xd0 net/ipv4/ip_output.c:128
 iptunnel_xmit+0x351/0x490 net/ipv4/ip_tunnel_core.c:82
 udp_tunnel_xmit_skb+0x1ae/0x1f0 net/ipv4/udp_tunnel_core.c:173
 send4+0x44c/0x530 drivers/net/wireguard/socket.c:85
 wg_socket_send_skb_to_peer+0x94/0x130 drivers/net/wireguard/socket.c:175
 wg_socket_send_buffer_to_peer+0xee/0x120 drivers/net/wireguard/socket.c:200
 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline]
 wg_packet_handshake_send_worker+0x10c/0x150 drivers/net/wireguard/send.c:51
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3310
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3391
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffffffff88bbb550 of 8 bytes by task 3376 on cpu 1:
 data_make_reusable kernel/printk/printk_ringbuffer.c:594 [inline]
 data_push_tail+0x102/0x430 kernel/printk/printk_ringbuffer.c:679
 data_alloc+0xbe/0x2c0 kernel/printk/printk_ringbuffer.c:1054
 prb_reserve+0x85e/0xb60 kernel/printk/printk_ringbuffer.c:1669
 vprintk_store+0x558/0x870 kernel/printk/printk.c:2326
 vprintk_emit+0x15e/0x680 kernel/printk/printk.c:2408
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2447
 vprintk+0x75/0x80 kernel/printk/printk_safe.c:86
 _printk+0x7a/0xa0 kernel/printk/printk.c:2457
 ip_vs_schedule+0xde2/0xeb0 net/netfilter/ipvs/ip_vs_core.c:518
 udp_conn_schedule+0x248/0x3b0 net/netfilter/ipvs/ip_vs_proto_udp.c:78
 ip_vs_try_to_schedule net/netfilter/ipvs/ip_vs_core.c:1482 [inline]
 ip_vs_in_hook+0x5d2/0x1210 net/netfilter/ipvs/ip_vs_core.c:2054
 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
 nf_hook_slow+0x86/0x1b0 net/netfilter/core.c:626
 nf_hook include/linux/netfilter.h:269 [inline]
 __ip_local_out+0x2d6/0x300 net/ipv4/ip_output.c:119
 ip_local_out+0x26/0xd0 net/ipv4/ip_output.c:128
 iptunnel_xmit+0x351/0x490 net/ipv4/ip_tunnel_core.c:82
 udp_tunnel_xmit_skb+0x1ae/0x1f0 net/ipv4/udp_tunnel_core.c:173
 send4+0x44c/0x530 drivers/net/wireguard/socket.c:85
 wg_socket_send_skb_to_peer+0x94/0x130 drivers/net/wireguard/socket.c:175
 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline]
 wg_packet_tx_worker+0x127/0x360 drivers/net/wireguard/send.c:276
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3310
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3391
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x00000000ffffe7ac -> 0x00000000fffff2dd

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3376 Comm: kworker/1:4 Not tainted 6.13.0-rc5-syzkaller-00012-g0bc21e701a6f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: wg-crypt-wg0 wg_packet_tx_worker
==================================================================
IPVS: Schedule: port zero only supported in persistent services, check your ipvs configuration
IPVS: Schedule: port zero only supported in persistent services, check your ipvs configuration
IPVS: Schedule: port zero only supported in persistent services, check your ipvs configuration
IPVS: Schedule: port zero only supported in persistent services, check your ipvs configuration