EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /121/bus supports timestamps until 2038-01-19 (0x7fffffff) ================================================================== BUG: KCSAN: data-race in data_push_tail / string write to 0xffffffff88e3d730 of 1 bytes by task 29 on cpu 0: string_nocheck lib/vsprintf.c:643 [inline] string+0x17d/0x210 lib/vsprintf.c:721 vsnprintf+0x539/0x8a0 lib/vsprintf.c:2852 vscnprintf+0x42/0x90 lib/vsprintf.c:2917 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2216 vprintk_store+0x583/0x860 kernel/printk/printk.c:2336 vprintk_emit+0x1a0/0x6c0 kernel/printk/printk.c:2426 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x7f/0xb0 kernel/printk/printk.c:2475 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+0x432/0x640 kernel/audit.c:890 kthread+0x4b7/0x540 kernel/kthread.c:464 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 read to 0xffffffff88e3d730 of 8 bytes by task 5347 on cpu 1: data_make_reusable kernel/printk/printk_ringbuffer.c:594 [inline] data_push_tail+0x107/0x440 kernel/printk/printk_ringbuffer.c:679 data_alloc+0xbd/0x2c0 kernel/printk/printk_ringbuffer.c:1054 prb_reserve+0x86a/0xb80 kernel/printk/printk_ringbuffer.c:1669 vprintk_store+0x552/0x860 kernel/printk/printk.c:2326 vprintk_emit+0x1a0/0x6c0 kernel/printk/printk.c:2426 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x7f/0xb0 kernel/printk/printk.c:2475 mnt_warn_timestamp_expiry+0x1cd/0x210 fs/namespace.c:3279 do_new_mount_fc fs/namespace.c:3816 [inline] do_new_mount+0x32c/0x6b0 fs/namespace.c:3883 path_mount+0x49b/0xb30 fs/namespace.c:4208 do_mount fs/namespace.c:4221 [inline] __do_sys_mount fs/namespace.c:4432 [inline] __se_sys_mount+0x28f/0x2e0 fs/namespace.c:4409 __x64_sys_mount+0x67/0x80 fs/namespace.c:4409 x64_sys_call+0xd11/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000ffffe0c5 -> 0x303d64696720303d Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 5347 Comm: syz.0.606 Not tainted 6.15.0-rc2-syzkaller-00048-gc62f4b82d571 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 ================================================================== EXT4-fs error (device loop0): ext4_do_update_inode:5211: inode #2: comm syz.0.606: corrupted inode contents EXT4-fs error (device loop0): ext4_dirty_inode:6103: inode #2: comm syz.0.606: mark_inode_dirty error EXT4-fs error (device loop0): ext4_do_update_inode:5211: inode #2: comm syz.0.606: corrupted inode contents EXT4-fs error (device loop0): __ext4_ext_dirty:207: inode #2: comm syz.0.606: mark_inode_dirty error netlink: 36 bytes leftover after parsing attributes in process `syz.0.606'.