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

write to 0xffffffff870e5e3f of 1 bytes by task 9520 on cpu 1:
 string_nocheck lib/vsprintf.c:650 [inline]
 string+0x16c/0x200 lib/vsprintf.c:728
 vsnprintf+0xa09/0xe30 lib/vsprintf.c:2824
 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
 dump_stack_print_info+0xb4/0x120 lib/dump_stack.c:57
 __dump_stack lib/dump_stack.c:87 [inline]
 dump_stack_lvl+0xce/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_failslab+0x92/0xa0 mm/failslab.c:44
 should_failslab+0x9/0x20 mm/slub.c:3747
 slab_pre_alloc_hook mm/slub.c:3763 [inline]
 slab_alloc_node mm/slub.c:3842 [inline]
 kmem_cache_alloc+0x56/0x2d0 mm/slub.c:3867
 kmem_cache_zalloc include/linux/slab.h:701 [inline]
 __kernfs_new_node+0x6a/0x380 fs/kernfs/dir.c:615
 kernfs_new_node+0xc8/0x140 fs/kernfs/dir.c:691
 __kernfs_create_file+0x49/0x180 fs/kernfs/file.c:1025
 sysfs_add_file_mode_ns+0x136/0x1b0 fs/sysfs/file.c:307
 sysfs_merge_group+0xfd/0x1d0 fs/sysfs/group.c:346
 dpm_sysfs_add+0xae/0x1e0 drivers/base/power/sysfs.c:707
 device_add+0x3fb/0x7e0 drivers/base/core.c:3585
 nfc_register_device+0x44/0x190 net/nfc/core.c:1118
 nci_register_device+0x4e6/0x570 net/nfc/nci/core.c:1266
 virtual_ncidev_open+0xdc/0x140 drivers/nfc/virtual_ncidev.c:153
 misc_open+0x203/0x240 drivers/char/misc.c:165
 chrdev_open+0x322/0x390 fs/char_dev.c:414
 do_dentry_open+0x637/0xbd0 fs/open.c:953
 vfs_open+0x4a/0x50 fs/open.c:1087
 do_open fs/namei.c:3641 [inline]
 path_openat+0x1821/0x1d40 fs/namei.c:3798
 do_filp_open+0xf6/0x200 fs/namei.c:3825
 do_sys_openat2+0xab/0x110 fs/open.c:1404
 do_sys_open fs/open.c:1419 [inline]
 __do_sys_openat fs/open.c:1435 [inline]
 __se_sys_openat fs/open.c:1430 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1430
 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 0xffffffff870e5e38 of 8 bytes by task 9516 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
 __nlmsg_parse include/net/netlink.h:756 [inline]
 genl_family_rcv_msg_attrs_parse+0x148/0x1a0 net/netlink/genetlink.c:943
 genl_family_rcv_msg_doit net/netlink/genetlink.c:1091 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:1193 [inline]
 genl_rcv_msg+0x47e/0x6c0 net/netlink/genetlink.c:1208
 netlink_rcv_skb+0x126/0x220 net/netlink/af_netlink.c:2543
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1217
 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: 0x00000000ffffe4cf -> 0x00203a6d6d6f4320

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 9516 Comm: syz-executor.0 Not tainted 6.8.0-rc2-syzkaller-00199-g021533194476 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
==================================================================
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.0'.
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.0'.
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.0'.
syz-executor.0 (9516) used greatest stack depth: 10040 bytes left