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BUG: KCSAN: data-race in data_alloc / prb_reserve

write to 0xffffffff8607e348 of 8 bytes by task 29 on cpu 1:
 data_alloc+0x291/0x2c0 kernel/printk/printk_ringbuffer.c:1096
 prb_reserve+0x85e/0xb60 kernel/printk/printk_ringbuffer.c:1669
 vprintk_store+0x53f/0x810 kernel/printk/printk.c:2266
 vprintk_emit+0x10c/0x5e0 kernel/printk/printk.c:2326
 vprintk_deferred kernel/printk/printk.c:3999 [inline]
 _printk_deferred+0x83/0xb0 kernel/printk/printk.c:4008
 ___ratelimit+0x297/0x2b0 lib/ratelimit.c:56
 __printk_ratelimit+0x1c/0x30 kernel/printk/printk.c:4024
 kauditd_printk_skb kernel/audit.c:545 [inline]
 kauditd_hold_skb+0x61/0x1b0 kernel/audit.c:581
 kauditd_send_queue+0x288/0x2e0 kernel/audit.c:766
 kauditd_thread+0x42a/0x650 kernel/audit.c:890
 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

read to 0xffffffff8607e348 of 8 bytes by task 28947 on cpu 0:
 desc_read kernel/printk/printk_ringbuffer.c:482 [inline]
 desc_push_tail kernel/printk/printk_ringbuffer.c:778 [inline]
 desc_reserve kernel/printk/printk_ringbuffer.c:924 [inline]
 prb_reserve+0x235/0xb60 kernel/printk/printk_ringbuffer.c:1619
 vprintk_store+0x53f/0x810 kernel/printk/printk.c:2266
 vprintk_emit+0x10c/0x5e0 kernel/printk/printk.c:2326
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2360
 vprintk+0x75/0x80 kernel/printk/printk_safe.c:45
 _printk+0x7a/0xa0 kernel/printk/printk.c:2370
 random_pm_notification+0x154/0x1a0 drivers/char/random.c:830
 notifier_call_chain kernel/notifier.c:93 [inline]
 notifier_call_chain_robust+0x77/0x1f0 kernel/notifier.c:128
 blocking_notifier_call_chain_robust+0x50/0x80 kernel/notifier.c:353
 pm_notifier_call_chain_robust+0x2c/0x60 kernel/power/main.c:102
 snapshot_open+0x125/0x260 kernel/power/user.c:87
 misc_open+0x207/0x240 drivers/char/misc.c:165
 chrdev_open+0x323/0x3a0 fs/char_dev.c:414
 do_dentry_open+0x644/0xbf0 fs/open.c:955
 vfs_open+0x30/0x40 fs/open.c:1089
 do_open fs/namei.c:3650 [inline]
 path_openat+0x18d6/0x1da0 fs/namei.c:3807
 do_filp_open+0xf7/0x200 fs/namei.c:3834
 do_sys_openat2+0xab/0x120 fs/open.c:1405
 do_sys_open fs/open.c:1420 [inline]
 __do_sys_openat fs/open.c:1436 [inline]
 __se_sys_openat fs/open.c:1431 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1431
 x64_sys_call+0x1057/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:258
 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: 0x00000000000e2438 -> 0x00000000001a85f0

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 28947 Comm: syz-executor.4 Not tainted 6.10.0-rc4-syzkaller-00045-g92e5605a199e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
==================================================================
random: crng reseeded on system resumption