syzbot

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BUG: KCSAN: data-race in data_push_tail / number

write to 0xffffffff86ecb7de of 1 bytes by task 23 on cpu 0:
 number+0x944/0xbe0 lib/vsprintf.c:562
 vsnprintf+0xa2f/0xe80 lib/vsprintf.c:2862
 vscnprintf+0x3e/0x80 lib/vsprintf.c:2902
 printk_sprint kernel/printk/printk.c:2178 [inline]
 vprintk_store+0x5dd/0xad0 kernel/printk/printk.c:2292
 vprintk_emit+0xcc/0x430 kernel/printk/printk.c:2338
 vprintk_default+0x22/0x30 kernel/printk/printk.c:2368
 vprintk+0x7f/0x90 kernel/printk/printk_safe.c:50
 _printk+0x76/0xa0 kernel/printk/printk.c:2378
 kauditd_printk_skb kernel/audit.c:536 [inline]
 kauditd_hold_skb+0x19b/0x1a0 kernel/audit.c:571
 kauditd_send_queue+0x297/0x300 kernel/audit.c:756
 kauditd_thread+0x48b/0x6d0 kernel/audit.c:880
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read to 0xffffffff86ecb7d8 of 8 bytes by task 27611 on cpu 1:
 data_make_reusable kernel/printk/printk_ringbuffer.c:590 [inline]
 data_push_tail+0x10f/0x440 kernel/printk/printk_ringbuffer.c:675
 data_alloc+0xbc/0x2b0 kernel/printk/printk_ringbuffer.c:1046
 prb_reserve+0x897/0xbd0 kernel/printk/printk_ringbuffer.c:1555
 vprintk_store+0x50b/0xad0 kernel/printk/printk.c:2282
 vprintk_emit+0xcc/0x430 kernel/printk/printk.c:2338
 vprintk_default+0x22/0x30 kernel/printk/printk.c:2368
 vprintk+0x7f/0x90 kernel/printk/printk_safe.c:50
 _printk+0x76/0xa0 kernel/printk/printk.c:2378
 __nla_validate_parse+0x155a/0x1970 lib/nlattr.c:612
 __nla_parse+0x3c/0x50 lib/nlattr.c:697
 nla_parse_nested_deprecated include/net/netlink.h:1280 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3506 [inline]
 rtnl_newlink+0x438/0x16f0 net/core/rtnetlink.c:3637
 rtnetlink_rcv_msg+0x811/0x8d0 net/core/rtnetlink.c:6141
 netlink_rcv_skb+0x13e/0x250 net/netlink/af_netlink.c:2564
 rtnetlink_rcv+0x18/0x20 net/core/rtnetlink.c:6159
 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline]
 netlink_unicast+0x58a/0x660 net/netlink/af_netlink.c:1356
 netlink_sendmsg+0x666/0x760 net/netlink/af_netlink.c:1932
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 ____sys_sendmsg+0x38f/0x500 net/socket.c:2476
 ___sys_sendmsg net/socket.c:2530 [inline]
 __sys_sendmsg+0x19a/0x230 net/socket.c:2559
 __do_sys_sendmsg net/socket.c:2568 [inline]
 __se_sys_sendmsg net/socket.c:2566 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2566
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000100000320 -> 0x303034313d657079

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 27611 Comm: syz-executor.4 Not tainted 6.2.0-rc2-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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syz-executor.4 (27611) used greatest stack depth: 9248 bytes left