EXT4-fs error (device loop6): ext4_lookup:1791: inode #2: comm syz.6.2093: deleted inode referenced: 12
EXT4-fs error (device loop6): ext4_lookup:1791: inode #2: comm syz.6.2093: deleted inode referenced: 12
EXT4-fs error (device loop6): ext4_lookup:1791: inode #2: comm syz.6.2093: deleted inode referenced: 12
EXT4-fs error (device loop6): ext4_lookup:1791: inode #2: comm syz.6.2093: deleted inode referenced: 12
==================================================================
BUG: KCSAN: data-race in console_flush_all / console_flush_all

write to 0xffffffff86a23ef8 of 8 bytes by task 9895 on cpu 1:
 console_emit_next_record kernel/printk/printk.c:3072 [inline]
 console_flush_all+0x35b/0x6a0 kernel/printk/printk.c:3199
 __console_flush_and_unlock kernel/printk/printk.c:3258 [inline]
 console_unlock+0xa1/0x2e0 kernel/printk/printk.c:3298
 vprintk_emit+0x3b5/0x580 kernel/printk/printk.c:2423
 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
 base_sock_release+0x3a/0x220 drivers/isdn/mISDN/socket.c:622
 __sock_release net/socket.c:662 [inline]
 sock_close+0x6b/0x150 net/socket.c:1455
 __fput+0x29b/0x650 fs/file_table.c:468
 ____fput+0x1c/0x30 fs/file_table.c:496
 task_work_run+0x131/0x1a0 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xed/0x110 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x1d6/0x200 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff86a23ef8 of 8 bytes by task 9879 on cpu 0:
 console_flush_all+0x528/0x6a0 kernel/printk/printk.c:3200
 __console_flush_and_unlock kernel/printk/printk.c:3258 [inline]
 console_unlock+0xa1/0x2e0 kernel/printk/printk.c:3298
 vprintk_emit+0x3b5/0x580 kernel/printk/printk.c:2423
 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_inode+0x2ca/0x3f0 fs/ext4/super.c:853
 ext4_lookup+0x24d/0x390 fs/ext4/namei.c:-1
 __lookup_slow+0x193/0x250 fs/namei.c:1816
 lookup_slow+0x3c/0x60 fs/namei.c:1833
 walk_component+0x1ec/0x220 fs/namei.c:2151
 lookup_last fs/namei.c:2652 [inline]
 path_lookupat+0xfe/0x2a0 fs/namei.c:2676
 filename_lookup+0x147/0x340 fs/namei.c:2705
 vfs_statx+0x9d/0x390 fs/stat.c:353
 vfs_fstatat fs/stat.c:375 [inline]
 vfs_lstat include/linux/fs.h:3595 [inline]
 __do_sys_newlstat fs/stat.c:528 [inline]
 __se_sys_newlstat+0x69/0x280 fs/stat.c:522
 __x64_sys_newlstat+0x31/0x40 fs/stat.c:522
 x64_sys_call+0x1b88/0x3000 arch/x86/include/generated/asm/syscalls_64.h:7
 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

value changed: 0x000000000000181d -> 0x000000000000181e

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 9879 Comm: syz.6.2093 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
==================================================================
EXT4-fs error (device loop6): ext4_lookup:1791: inode #2: comm syz.6.2093: deleted inode referenced: 12