syzbot

audit: type=1326 audit(1759278875.556:1470): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=4153 comm="syz.0.252" exe="/root/syz-executor" sig=0 arch=c000003e syscall=321 compat=0 ip=0x7f3469ddeec9 code=0x7ffc0000
audit: type=1326 audit(1759278875.556:1471): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=4153 comm="syz.0.252" exe="/root/syz-executor" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f3469ddeec9 code=0x7ffc0000
==================================================================
BUG: KCSAN: data-race in console_flush_all / console_flush_all

write to 0xffffffff86a214d8 of 8 bytes by task 4150 on cpu 1:
 console_emit_next_record kernel/printk/printk.c:3099 [inline]
 console_flush_all+0x35a/0x730 kernel/printk/printk.c:3226
 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
 console_unlock+0xa1/0x330 kernel/printk/printk.c:3325
 vprintk_emit+0x388/0x650 kernel/printk/printk.c:2450
 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
 __ext4_msg+0x18f/0x1a0 fs/ext4/super.c:981
 ext4_process_orphan+0x18e/0x1c0 fs/ext4/orphan.c:353
 ext4_orphan_cleanup+0x6a8/0xa00 fs/ext4/orphan.c:474
 __ext4_fill_super fs/ext4/super.c:5615 [inline]
 ext4_fill_super+0x3260/0x35d0 fs/ext4/super.c:5734
 get_tree_bdev_flags+0x28e/0x300 fs/super.c:1692
 get_tree_bdev+0x1f/0x30 fs/super.c:1715
 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5766
 vfs_get_tree+0x57/0x1d0 fs/super.c:1752
 do_new_mount+0x207/0x600 fs/namespace.c:3750
 path_mount+0x4a4/0xb30 fs/namespace.c:4065
 do_mount fs/namespace.c:4078 [inline]
 __do_sys_mount fs/namespace.c:4278 [inline]
 __se_sys_mount+0x28f/0x2e0 fs/namespace.c:4255
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4255
 x64_sys_call+0x2b4d/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:166
 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 0xffffffff86a214d8 of 8 bytes by task 29 on cpu 0:
 console_flush_all+0x563/0x730 kernel/printk/printk.c:3227
 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
 console_unlock+0xa1/0x330 kernel/printk/printk.c:3325
 vprintk_emit+0x388/0x650 kernel/printk/printk.c:2450
 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+0x270/0x2c0 kernel/audit.c:766
 kauditd_thread+0x421/0x630 kernel/audit.c:890
 kthread+0x486/0x510 kernel/kthread.c:463
 ret_from_fork+0x11f/0x1b0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x00000000000007bb -> 0x00000000000007bc

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 08/18/2025
==================================================================
audit: type=1326 audit(1759278875.556:1472): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=4153 comm="syz.0.252" exe="/root/syz-executor" sig=0 arch=c000003e syscall=321 compat=0 ip=0x7f3469ddeec9 code=0x7ffc0000
audit: type=1326 audit(1759278875.606:1473): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=4153 comm="syz.0.252" exe="/root/syz-executor" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f3469ddeec9 code=0x7ffc0000
audit: type=1326 audit(1759278875.606:1474): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=root:sysadm_r:sysadm_t pid=4153 comm="syz.0.252" exe="/root/syz-executor" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f3469ddeec9 code=0x7ffc0000