==================================================================
BUG: KCSAN: data-race in data_alloc / prb_reserve

write to 0xffffffff86c715a0 of 8 bytes by task 28 on cpu 0:
 data_alloc+0x31c/0x390 kernel/printk/printk_ringbuffer.c:1130
 prb_reserve+0x8d7/0xae0 kernel/printk/printk_ringbuffer.c:1724
 vprintk_store+0x54a/0x910 kernel/printk/printk.c:2354
 vprintk_emit+0x1a4/0x600 kernel/printk/printk.c:2455
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2494
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2504
 kauditd_printk_skb kernel/audit.c:587 [inline]
 kauditd_hold_skb+0x1b1/0x1c0 kernel/audit.c:622
 kauditd_send_queue+0x273/0x2c0 kernel/audit.c:807
 kauditd_thread+0x444/0x670 kernel/audit.c:931
 kthread+0x22a/0x280 kernel/kthread.c:467
 ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffffffff86c715a0 of 8 bytes by task 20755 on cpu 1:
 desc_read kernel/printk/printk_ringbuffer.c:496 [inline]
 desc_push_tail kernel/printk/printk_ringbuffer.c:792 [inline]
 desc_reserve kernel/printk/printk_ringbuffer.c:938 [inline]
 prb_reserve+0x207/0xae0 kernel/printk/printk_ringbuffer.c:1674
 vprintk_store+0x54a/0x910 kernel/printk/printk.c:2354
 vprintk_emit+0x1a4/0x600 kernel/printk/printk.c:2455
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2494
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2504
 sidtab_context_to_sid+0x5bf/0x5e0 security/selinux/ss/sidtab.c:348
 security_context_to_sid_core+0x2e2/0x440 security/selinux/ss/services.c:1608
 security_context_to_sid_force+0x30/0x40 security/selinux/ss/services.c:1681
 selinux_inode_setxattr+0x4e4/0x6d0 security/selinux/hooks.c:3411
 security_inode_setxattr+0x12e/0x1a0 security/security.c:1914
 __vfs_setxattr_locked+0x8b/0x220 fs/xattr.c:286
 vfs_setxattr+0x12c/0x2a0 fs/xattr.c:321
 do_setxattr fs/xattr.c:636 [inline]
 file_setxattr+0x138/0x1b0 fs/xattr.c:646
 path_setxattrat+0x281/0x310 fs/xattr.c:706
 __do_sys_fsetxattr fs/xattr.c:756 [inline]
 __se_sys_fsetxattr fs/xattr.c:753 [inline]
 __x64_sys_fsetxattr+0x6b/0x80 fs/xattr.c:753
 x64_sys_call+0x2f0e/0x3020 arch/x86/include/generated/asm/syscalls_64.h:191
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xfffffffffffd4588 -> 0x0000000000085e08

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 20755 Comm: syz.2.5012 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
==================================================================
SELinux:  Context system_u:object_r:audisp_exec_t:s0 is not valid (left unmapped).