==================================================================
BUG: KCSAN: data-race in data_push_tail / symbol_string

write to 0xffffffff870e3c38 of 1 bytes by task 27088 on cpu 1:
 string_nocheck lib/vsprintf.c:650 [inline]
 symbol_string+0x1b6/0x240 lib/vsprintf.c:1006
 pointer+0x77a/0xd10 lib/vsprintf.c:2422
 vsnprintf+0x861/0xe30 lib/vsprintf.c:2828
 vscnprintf+0x42/0x80 lib/vsprintf.c:2930
 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2124
 vprintk_store+0x56f/0x800 kernel/printk/printk.c:2238
 vprintk_emit+0xd0/0x5d0 kernel/printk/printk.c:2284
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2318
 vprintk+0x71/0x80 kernel/printk/printk_safe.c:45
 _printk+0x7a/0xa0 kernel/printk/printk.c:2328
 show_ip arch/x86/kernel/dumpstack.c:142 [inline]
 show_iret_regs+0x2e/0x60 arch/x86/kernel/dumpstack.c:149
 __show_regs+0x2b/0x430 arch/x86/kernel/process_64.c:75
 show_trace_log_lvl+0x3d2/0x510 arch/x86/kernel/dumpstack.c:301
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xda/0x130 lib/dump_stack.c:106
 dump_stack+0x15/0x20 lib/dump_stack.c:113
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail_ex+0x21f/0x230 lib/fault-inject.c:153
 should_fail+0xb/0x10 lib/fault-inject.c:163
 should_fail_usercopy+0x1a/0x20 lib/fault-inject-usercopy.c:37
 _copy_from_user+0x1e/0xd0 lib/usercopy.c:15
 copy_from_user include/linux/uaccess.h:183 [inline]
 ____sys_sendmsg+0x1af/0x4d0 net/socket.c:2561
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmmsg+0x269/0x500 net/socket.c:2724
 __do_sys_sendmmsg net/socket.c:2753 [inline]
 __se_sys_sendmmsg net/socket.c:2750 [inline]
 __x64_sys_sendmmsg+0x57/0x60 net/socket.c:2750
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffffffff870e3c38 of 8 bytes by task 27093 on cpu 0:
 data_make_reusable kernel/printk/printk_ringbuffer.c:590 [inline]
 data_push_tail+0x102/0x430 kernel/printk/printk_ringbuffer.c:675
 data_alloc+0xbe/0x2c0 kernel/printk/printk_ringbuffer.c:1046
 prb_reserve+0x897/0xbc0 kernel/printk/printk_ringbuffer.c:1555
 vprintk_store+0x53e/0x800 kernel/printk/printk.c:2228
 vprintk_emit+0xd0/0x5d0 kernel/printk/printk.c:2284
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2318
 vprintk+0x71/0x80 kernel/printk/printk_safe.c:45
 _printk+0x7a/0xa0 kernel/printk/printk.c:2328
 __nla_validate_parse+0x175f/0x1ce0 lib/nlattr.c:643
 __nla_parse+0x40/0x50 lib/nlattr.c:728
 nla_parse_nested_deprecated include/net/netlink.h:1325 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3616 [inline]
 rtnl_newlink+0x3fd/0x1670 net/core/rtnetlink.c:3751
 rtnetlink_rcv_msg+0x80a/0x8c0 net/core/rtnetlink.c:6618
 netlink_rcv_skb+0x126/0x220 net/netlink/af_netlink.c:2543
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6636
 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
 netlink_unicast+0x589/0x660 net/netlink/af_netlink.c:1367
 netlink_sendmsg+0x66e/0x770 net/netlink/af_netlink.c:1908
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x37c/0x4d0 net/socket.c:2584
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmsg+0x1e9/0x270 net/socket.c:2667
 __do_sys_sendmsg net/socket.c:2676 [inline]
 __se_sys_sendmsg net/socket.c:2674 [inline]
 __x64_sys_sendmsg+0x46/0x50 net/socket.c:2674
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x00000001000046a9 -> 0x3961643362306161

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 27093 Comm: syz-executor.2 Not tainted 6.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
==================================================================