IPVS: lblc: UDP 224.0.0.2:0 - no destination available
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BUG: KCSAN: data-race in data_push_tail / vsnprintf

write to 0xffffffff88bb0d25 of 1 bytes by task 11980 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:11940
 netdev_info+0x99/0xc0 net/core/dev.c:11987
 __dev_set_allmulti+0x15b/0x240 net/core/dev.c:8803
 dev_set_allmulti+0x1f/0x30 net/core/dev.c:8829
 packet_dev_mc net/packet/af_packet.c:3715 [inline]
 packet_dev_mclist_delete net/packet/af_packet.c:3737 [inline]
 packet_notifier+0x28d/0x510 net/packet/af_packet.c:4262
 notifier_call_chain kernel/notifier.c:85 [inline]
 raw_notifier_call_chain+0x6f/0x1d0 kernel/notifier.c:453
 call_netdevice_notifiers_info+0xae/0x100 net/core/dev.c:1996
 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline]
 call_netdevice_notifiers net/core/dev.c:2048 [inline]
 unregister_netdevice_many_notify+0x8b7/0x11b0 net/core/dev.c:11520
 unregister_netdevice_many net/core/dev.c:11584 [inline]
 unregister_netdevice_queue+0x1f4/0x220 net/core/dev.c:11456
 br_dev_delete+0xc4/0xe0 net/bridge/br_if.c:396
 br_del_bridge+0x99/0xc0 net/bridge/br_if.c:495
 br_ioctl_stub+0x2fe/0x5d0
 br_ioctl_call net/socket.c:1182 [inline]
 sock_ioctl+0x3dd/0x600 net/socket.c:1282
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xc9/0x140 fs/ioctl.c:892
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:892
 x64_sys_call+0x1690/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:17
 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 0xffffffff88bb0d20 of 8 bytes by task 11971 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_scheduler_err+0x186/0x190
 ip_vs_lblc_schedule+0x350/0x8a0 net/netfilter/ipvs/ip_vs_lblc.c:513
 ip_vs_sched_persist net/netfilter/ipvs/ip_vs_core.c:353 [inline]
 ip_vs_schedule+0x931/0xeb0 net/netfilter/ipvs/ip_vs_core.c:508
 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 net/ipv4/ip_output.c:128 [inline]
 ip_send_skb+0x30/0x140 net/ipv4/ip_output.c:1505
 udp_send_skb+0x6a6/0x9f0 net/ipv4/udp.c:1142
 udp_sendmsg+0x1257/0x12f0 net/ipv4/udp.c:1430
 inet_sendmsg+0xaf/0xd0 net/ipv4/af_inet.c:851
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x102/0x180 net/socket.c:726
 ____sys_sendmsg+0x312/0x410 net/socket.c:2583
 ___sys_sendmsg net/socket.c:2637 [inline]
 __sys_sendmmsg+0x227/0x4b0 net/socket.c:2726
 __do_sys_sendmmsg net/socket.c:2753 [inline]
 __se_sys_sendmmsg net/socket.c:2750 [inline]
 __x64_sys_sendmmsg+0x57/0x70 net/socket.c:2750
 x64_sys_call+0x29aa/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:308
 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

value changed: 0x00000000fffff265 -> 0x0000000a65646564

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 11971 Comm: syz.2.2456 Not tainted 6.12.0-syzkaller-12128-gf788b5ef1ca9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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