audit: type=1326 audit(1733252548.181:27543): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=24102 comm="syz.0.7907" exe="/root/syz-executor" sig=0 arch=c000003e syscall=41 compat=0 ip=0x7f5907b9ff19 code=0x7ffc0000
==================================================================
BUG: KCSAN: data-race in data_alloc / prb_reserve

write to 0xffffffff86669490 of 8 bytes by task 24106 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+0x558/0x870 kernel/printk/printk.c:2326
 vprintk_emit+0x15e/0x680 kernel/printk/printk.c:2408
 dev_vprintk_emit+0x1df/0x210 drivers/base/core.c:4935
 dev_printk_emit+0x82/0xb0 drivers/base/core.c:4946
 __dev_printk+0xf6/0x110 drivers/base/core.c:4958
 _dev_printk+0x94/0xc0 drivers/base/core.c:4975
 sdev_prefix_printk+0x14f/0x170 drivers/scsi/scsi_logging.c:78
 ioctl_internal_command+0x225/0x250 drivers/scsi/scsi_ioctl.c:93
 scsi_ioctl+0x660/0x1540
 sg_ioctl+0xd00/0x1870 drivers/scsi/sg.c:1159
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xc9/0x140 fs/ioctl.c:892
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:892
 x64_sys_call+0x1690/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:17
 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 0xffffffff86669490 of 8 bytes by task 29 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+0x558/0x870 kernel/printk/printk.c:2326
 vprintk_emit+0x15e/0x680 kernel/printk/printk.c:2408
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2447
 vprintk+0x75/0x80 kernel/printk/printk_safe.c:86
 _printk+0x7a/0xa0 kernel/printk/printk.c:2457
 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: 0xfffffffffffcf4e0 -> 0x000000000008fa90

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 29 Comm: kauditd Not tainted 6.13.0-rc1-syzkaller-00005-gceb8bf2ceaa7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
==================================================================
audit: type=1326 audit(1733252548.181:27544): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=24102 comm="syz.0.7907" exe="/root/syz-executor" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f5907b9ff19 code=0x7ffc0000
audit: type=1326 audit(1733252548.181:27545): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=24102 comm="syz.0.7907" exe="/root/syz-executor" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f5907b9ff19 code=0x7ffc0000
audit: type=1326 audit(1733252548.181:27546): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=24102 comm="syz.0.7907" exe="/root/syz-executor" sig=0 arch=c000003e syscall=46 compat=0 ip=0x7f5907b9ff19 code=0x7ffc0000
audit: type=1326 audit(1733252548.181:27547): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=24102 comm="syz.0.7907" exe="/root/syz-executor" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f5907b9ff19 code=0x7ffc0000
audit: type=1326 audit(1733252548.181:27548): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=24102 comm="syz.0.7907" exe="/root/syz-executor" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f5907b9ff19 code=0x7ffc0000
audit: type=1326 audit(1733252548.181:27549): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=24102 comm="syz.0.7907" exe="/root/syz-executor" sig=0 arch=c000003e syscall=46 compat=0 ip=0x7f5907b9ff19 code=0x7ffc0000