audit: type=1326 audit(1749564837.086:22731): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=9932 comm="syz.1.2165" exe="/root/syz-executor" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f1f6207e929 code=0x7ffc0000
audit: type=1326 audit(1749564837.086:22732): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=9932 comm="syz.1.2165" exe="/root/syz-executor" sig=0 arch=c000003e syscall=16 compat=0 ip=0x7f1f6207e929 code=0x7ffc0000
==================================================================
BUG: KCSAN: data-race in data_push_tail / vsnprintf

write to 0xffffffff88e32040 of 43 bytes by task 9937 on cpu 1:
 vsnprintf+0x2ce/0x890 lib/vsprintf.c:2826
 vscnprintf+0x41/0x90 lib/vsprintf.c:2939
 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2216
 vprintk_store+0x599/0x860 kernel/printk/printk.c:2336
 vprintk_emit+0x178/0x650 kernel/printk/printk.c:2426
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2475
 isofs_read_inode fs/isofs/inode.c:1378 [inline]
 __isofs_iget+0xe9a/0x1090 fs/isofs/inode.c:1512
 isofs_iget fs/isofs/isofs.h:135 [inline]
 isofs_get_blocks+0x185/0x490 fs/isofs/inode.c:1064
 isofs_get_block fs/isofs/inode.c:1117 [inline]
 isofs_bmap fs/isofs/inode.c:1128 [inline]
 isofs_bread+0x5b/0x100 fs/isofs/inode.c:1136
 isofs_find_entry fs/isofs/namei.c:59 [inline]
 isofs_lookup+0x1a8/0x930 fs/isofs/namei.c:165
 lookup_open fs/namei.c:3686 [inline]
 open_last_lookups fs/namei.c:3807 [inline]
 path_openat+0xcf3/0x2170 fs/namei.c:4043
 do_filp_open+0x109/0x230 fs/namei.c:4073
 do_open_execat+0xd8/0x260 fs/exec.c:780
 alloc_bprm+0x25/0x350 fs/exec.c:1405
 do_execveat_common+0x12e/0x750 fs/exec.c:1806
 do_execve fs/exec.c:1929 [inline]
 __do_sys_execve fs/exec.c:2005 [inline]
 __se_sys_execve fs/exec.c:2000 [inline]
 __x64_sys_execve+0x5c/0x70 fs/exec.c:2000
 x64_sys_call+0x13ab/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:60
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff88e32058 of 8 bytes by task 29 on cpu 0:
 data_make_reusable kernel/printk/printk_ringbuffer.c:594 [inline]
 data_push_tail+0xfd/0x420 kernel/printk/printk_ringbuffer.c:679
 data_alloc+0xbf/0x2b0 kernel/printk/printk_ringbuffer.c:1054
 prb_reserve+0x808/0xaf0 kernel/printk/printk_ringbuffer.c:1669
 vprintk_store+0x56d/0x860 kernel/printk/printk.c:2326
 vprintk_emit+0x178/0x650 kernel/printk/printk.c:2426
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2475
 kauditd_printk_skb kernel/audit.c:546 [inline]
 kauditd_hold_skb+0x1b1/0x1c0 kernel/audit.c:581
 kauditd_send_queue+0x273/0x2c0 kernel/audit.c:766
 kauditd_thread+0x421/0x630 kernel/audit.c:890
 kthread+0x486/0x510 kernel/kthread.c:464
 ret_from_fork+0xda/0x150 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x00000000ffffef44 -> 0x4920726f66203020

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 29 Comm: kauditd Not tainted 6.16.0-rc1-syzkaller-00003-gf09079bd04a9 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
==================================================================
audit: type=1326 audit(1749564837.086:22733): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=9932 comm="syz.1.2165" exe="/root/syz-executor" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f1f6207e929 code=0x7ffc0000
audit: type=1326 audit(1749564837.096:22734): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=9932 comm="syz.1.2165" exe="/root/syz-executor" sig=0 arch=c000003e syscall=44 compat=0 ip=0x7f1f6207e929 code=0x7ffc0000
audit: type=1326 audit(1749564837.096:22735): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=9932 comm="syz.1.2165" exe="/root/syz-executor" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f1f6207e929 code=0x7ffc0000
audit: type=1326 audit(1749564837.096:22736): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=9932 comm="syz.1.2165" exe="/root/syz-executor" sig=0 arch=c000003e syscall=16 compat=0 ip=0x7f1f6207e929 code=0x7ffc0000