audit: type=1326 audit(2000000083.548:37535): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=23431 comm="syz.2.9255" exe="/root/syz-executor" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f231d08def9 code=0x7ffc0000
audit: type=1326 audit(2000000083.678:37536): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=23455 comm="syz.2.9262" exe="/root/syz-executor" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f231d08def9 code=0x7ffc0000
==================================================================
BUG: KCSAN: data-race in data_push_tail / number

write to 0xffffffff88b995f6 of 1 bytes by task 23450 on cpu 1:
 number+0x7d0/0xa90 lib/vsprintf.c:564
 vsnprintf+0xa44/0xe30 lib/vsprintf.c:2890
 vscnprintf+0x42/0x90 lib/vsprintf.c:2930
 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2165
 vprintk_store+0x570/0x810 kernel/printk/printk.c:2279
 vprintk_emit+0x13a/0x610 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
 isofs_find_entry fs/isofs/namei.c:102 [inline]
 isofs_lookup+0x849/0x8c0 fs/isofs/namei.c:165
 __lookup_slow+0x184/0x250 fs/namei.c:1718
 lookup_slow+0x3c/0x60 fs/namei.c:1735
 walk_component fs/namei.c:2039 [inline]
 link_path_walk+0x69e/0x820 fs/namei.c:2404
 path_openat+0x1aa/0x1f10 fs/namei.c:3882
 do_filp_open+0xf7/0x200 fs/namei.c:3913
 do_sys_openat2+0xab/0x120 fs/open.c:1416
 do_sys_open fs/open.c:1431 [inline]
 __do_sys_openat fs/open.c:1447 [inline]
 __se_sys_openat fs/open.c:1442 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1442
 x64_sys_call+0x1025/0x2d60 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

read to 0xffffffff88b995f0 of 8 bytes by task 29 on cpu 0:
 data_make_reusable kernel/printk/printk_ringbuffer.c:594 [inline]
 data_push_tail+0x102/0x430 kernel/printk/printk_ringbuffer.c:679
 data_alloc+0xbe/0x2c0 kernel/printk/printk_ringbuffer.c:1054
 prb_reserve+0x85e/0xb60 kernel/printk/printk_ringbuffer.c:1669
 vprintk_store+0x53f/0x810 kernel/printk/printk.c:2269
 vprintk_emit+0x13a/0x610 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+0x1a3/0x1b0 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

value changed: 0x00000000ffffec0a -> 0x666f2036206b636f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 29 Comm: kauditd Not tainted 6.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
==================================================================
audit: type=1326 audit(2000000083.678:37537): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=23455 comm="syz.2.9262" exe="/root/syz-executor" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f231d08def9 code=0x7ffc0000
audit: type=1326 audit(2000000083.678:37538): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=23455 comm="syz.2.9262" exe="/root/syz-executor" sig=0 arch=c000003e syscall=311 compat=0 ip=0x7f231d08def9 code=0x7ffc0000
audit: type=1326 audit(2000000083.678:37539): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=23455 comm="syz.2.9262" exe="/root/syz-executor" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f231d08def9 code=0x7ffc0000