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

write to 0xffffffff88bc747b of 1 bytes by task 12590 on cpu 0:
 vsnprintf+0xdd8/0xe30
 va_format lib/vsprintf.c:1718 [inline]
 pointer+0x8a1/0xd20 lib/vsprintf.c:2479
 vsnprintf+0x861/0xe30 lib/vsprintf.c:2852
 vscnprintf+0x42/0x90 lib/vsprintf.c:2954
 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2216
 vprintk_store+0x589/0x870 kernel/printk/printk.c:2336
 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
 __netdev_printk+0x2d1/0x3e0 net/core/dev.c:11965
 netdev_info+0x99/0xc0 net/core/dev.c:12012
 __dev_set_promiscuity+0x165/0x340 net/core/dev.c:8757
 dev_set_promiscuity+0x3b/0x90 net/core/dev.c:8795
 br_port_set_promisc net/bridge/br_if.c:108 [inline]
 br_manage_promisc+0xf4/0x360 net/bridge/br_if.c:157
 nbp_update_port_count+0xbc/0xd0 net/bridge/br_if.c:242
 br_add_if+0x4f8/0xa50 net/bridge/br_if.c:640
 br_add_slave+0x2c/0x40 net/bridge/br_device.c:373
 do_set_master net/core/rtnetlink.c:2917 [inline]
 do_setlink+0x7fb/0x22c0 net/core/rtnetlink.c:3116
 rtnl_changelink net/core/rtnetlink.c:3723 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3875 [inline]
 rtnl_newlink+0xde9/0x1250 net/core/rtnetlink.c:4012
 rtnetlink_rcv_msg+0x651/0x710 net/core/rtnetlink.c:6922
 netlink_rcv_skb+0x12c/0x230 net/netlink/af_netlink.c:2542
 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:6949
 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline]
 netlink_unicast+0x599/0x670 net/netlink/af_netlink.c:1347
 netlink_sendmsg+0x5cc/0x6e0 net/netlink/af_netlink.c:1891
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x140/0x180 net/socket.c:726
 __sys_sendto+0x1a8/0x230 net/socket.c:2197
 __do_sys_sendto net/socket.c:2204 [inline]
 __se_sys_sendto net/socket.c:2200 [inline]
 __x64_sys_sendto+0x78/0x90 net/socket.c:2200
 x64_sys_call+0x29fa/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:45
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff88bc7478 of 8 bytes by task 28 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_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:3236 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3317
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3398
 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: 0x00000000ffffe996 -> 0x00000000000a6564

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 28 Comm: kworker/u8:1 Not tainted 6.13.0-rc7-syzkaller-00043-g619f0b6fad52 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: wg-kex-wg2 wg_packet_handshake_send_worker
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