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

write to 0xffffffff86071cc0 of 8 bytes by task 23390 on cpu 0:
 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:2269
 vprintk_emit+0x10c/0x5e0 kernel/printk/printk.c:2329
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2363
 vprintk+0x75/0x80 kernel/printk/printk_safe.c:45
 _printk+0x7a/0xa0 kernel/printk/printk.c:2373
 __ext4_error_inode+0x30b/0x400 fs/ext4/super.c:864
 __ext4_check_dir_entry+0x478/0x500 fs/ext4/dir.c:117
 ext4_generic_delete_entry+0x9d/0x210 fs/ext4/namei.c:2675
 ext4_delete_entry+0x2c7/0x390 fs/ext4/namei.c:2734
 ext4_rename_delete+0x202/0x370 fs/ext4/namei.c:3728
 ext4_rename fs/ext4/namei.c:3962 [inline]
 ext4_rename2+0x16bd/0x1f80 fs/ext4/namei.c:4214
 vfs_rename+0x872/0x9c0 fs/namei.c:4880
 do_renameat2+0x732/0xa60 fs/namei.c:5037
 __do_sys_renameat2 fs/namei.c:5071 [inline]
 __se_sys_renameat2 fs/namei.c:5068 [inline]
 __x64_sys_renameat2+0x86/0xa0 fs/namei.c:5068
 x64_sys_call+0x236b/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:317
 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+0x77/0x7f

read to 0xffffffff86071cc0 of 8 bytes by task 28 on cpu 1:
 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:2269
 vprintk_emit+0x10c/0x5e0 kernel/printk/printk.c:2329
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2363
 vprintk+0x75/0x80 kernel/printk/printk_safe.c:45
 _printk+0x7a/0xa0 kernel/printk/printk.c:2373
 kauditd_printk_skb kernel/audit.c:546 [inline]
 kauditd_hold_skb+0x1a1/0x1b0 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:388
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x0000000000098120 -> 0x0000000000141ef8

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 28 Comm: kauditd Tainted: G        W          6.9.0-rc4-syzkaller-00031-g96fca68c4fbf #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
==================================================================
audit: type=1400 audit(1713364837.838:1419): avc:  denied  { rename } for  pid=23388 comm="syz-executor.3" name="file1" dev="loop3" ino=15 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:unlabeled_t tclass=file permissive=1
audit: type=1326 audit(1713364839.978:1420): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=23496 comm="syz-executor.4" exe="/root/syz-executor.4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fd724f7bea9 code=0x0
audit: type=1400 audit(1713364843.228:1421): avc:  denied  { setopt } for  pid=23631 comm="syz-executor.4" scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:unlabeled_t tclass=socket permissive=1