audit: type=1400 audit(110.014:2970): avc:  denied  { create } for  pid=7075 comm="syz.3.1121" name="file5" scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:unlabeled_t tclass=blk_file permissive=1
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BUG: KCSAN: data-race in data_push_tail / vsnprintf

write to 0xffffffff88e7c7e0 of 24 bytes by task 7076 on cpu 1:
 vsnprintf+0x2ce/0x860 lib/vsprintf.c:2878
 vscnprintf+0x41/0x90 lib/vsprintf.c:2991
 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2189
 vprintk_store+0x599/0x860 kernel/printk/printk.c:2309
 vprintk_emit+0x10d/0x580 kernel/printk/printk.c:2399
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2438
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2448
 __ext4_error+0x248/0x320 fs/ext4/super.c:822
 __ext4_new_inode+0xdd0/0x2330 fs/ext4/ialloc.c:1072
 ext4_mknod+0x178/0x2f0 fs/ext4/namei.c:2857
 vfs_mknod+0x3e9/0x430 fs/namei.c:4988
 do_mknodat+0x271/0x500 fs/namei.c:-1
 __do_sys_mknodat fs/namei.c:5071 [inline]
 __se_sys_mknodat fs/namei.c:5068 [inline]
 __x64_sys_mknodat+0x5e/0x70 fs/namei.c:5068
 x64_sys_call+0x2b33/0x3000 arch/x86/include/generated/asm/syscalls_64.h:260
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd8/0x2a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff88e7c7f0 of 8 bytes by task 29 on cpu 0:
 data_make_reusable kernel/printk/printk_ringbuffer.c:591 [inline]
 data_push_tail+0x100/0x470 kernel/printk/printk_ringbuffer.c:676
 data_alloc+0x10f/0x380 kernel/printk/printk_ringbuffer.c:1061
 prb_reserve+0x964/0xb60 kernel/printk/printk_ringbuffer.c:1685
 vprintk_store+0x56d/0x860 kernel/printk/printk.c:2299
 vprintk_emit+0x10d/0x580 kernel/printk/printk.c:2399
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2438
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2448
 kauditd_printk_skb kernel/audit.c:583 [inline]
 kauditd_hold_skb+0x1b1/0x1c0 kernel/audit.c:618
 kauditd_send_queue+0x273/0x2c0 kernel/audit.c:803
 kauditd_thread+0x442/0x680 kernel/audit.c:927
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x149/0x290 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

value changed: 0x00000000ffffe3ef -> 0x6f6c206563697665

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 29 Comm: kauditd Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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