EXT4-fs error (device loop0): ext4_do_update_inode:5568: inode #13: comm syz.0.3492: corrupted inode contents EXT4-fs error (device loop0): ext4_truncate:4597: inode #13: comm syz.0.3492: mark_inode_dirty error ================================================================== BUG: KCSAN: data-race in data_push_tail / string write to 0xffffffff88e4c6b0 of 1 bytes by task 14062 on cpu 0: string_nocheck lib/vsprintf.c:643 [inline] string+0x187/0x220 lib/vsprintf.c:721 vsnprintf+0x532/0x890 lib/vsprintf.c:2874 vscnprintf+0x41/0x90 lib/vsprintf.c:2939 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2216 vprintk_store+0x599/0x860 kernel/printk/printk.c:2336 vprintk_emit+0x178/0x650 kernel/printk/printk.c:2426 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_std_error+0x346/0x370 fs/ext4/super.c:956 ext4_process_orphan+0x14e/0x1c0 fs/ext4/orphan.c:347 ext4_orphan_cleanup+0x6a8/0xa00 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5605 [inline] ext4_fill_super+0x3171/0x34e0 fs/ext4/super.c:5724 get_tree_bdev_flags+0x291/0x300 fs/super.c:1681 get_tree_bdev+0x1f/0x30 fs/super.c:1704 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5756 vfs_get_tree+0x54/0x1d0 fs/super.c:1804 do_new_mount+0x207/0x680 fs/namespace.c:3902 path_mount+0x4a4/0xb20 fs/namespace.c:4226 do_mount fs/namespace.c:4239 [inline] __do_sys_mount fs/namespace.c:4450 [inline] __se_sys_mount+0x28f/0x2e0 fs/namespace.c:4427 __x64_sys_mount+0x67/0x80 fs/namespace.c:4427 x64_sys_call+0xd36/0x2fb0 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 0xffffffff88e4c6b0 of 8 bytes by task 14087 on cpu 1: data_make_reusable kernel/printk/printk_ringbuffer.c:594 [inline] data_push_tail+0xfd/0x420 kernel/printk/printk_ringbuffer.c:679 data_alloc+0xbf/0x2b0 kernel/printk/printk_ringbuffer.c:1054 prb_reserve+0x808/0xaf0 kernel/printk/printk_ringbuffer.c:1669 vprintk_store+0x56d/0x860 kernel/printk/printk.c:2326 vprintk_emit+0x178/0x650 kernel/printk/printk.c:2426 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_error_inode+0x2ca/0x3f0 fs/ext4/super.c:844 __ext4_mark_inode_dirty+0xbd/0x3f0 fs/ext4/inode.c:6433 ext4_truncate+0x8d3/0xad0 fs/ext4/inode.c:4597 ext4_process_orphan+0x110/0x1c0 fs/ext4/orphan.c:339 ext4_orphan_cleanup+0x6a8/0xa00 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5605 [inline] ext4_fill_super+0x3171/0x34e0 fs/ext4/super.c:5724 get_tree_bdev_flags+0x291/0x300 fs/super.c:1681 get_tree_bdev+0x1f/0x30 fs/super.c:1704 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5756 vfs_get_tree+0x54/0x1d0 fs/super.c:1804 do_new_mount+0x207/0x680 fs/namespace.c:3902 path_mount+0x4a4/0xb20 fs/namespace.c:4226 do_mount fs/namespace.c:4239 [inline] __do_sys_mount fs/namespace.c:4450 [inline] __se_sys_mount+0x28f/0x2e0 fs/namespace.c:4427 __x64_sys_mount+0x67/0x80 fs/namespace.c:4427 x64_sys_call+0xd36/0x2fb0 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 value changed: 0x0000000100000105 -> 0x3a3734333a6e6168 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 14087 Comm: syz.0.3492 Not tainted 6.16.0-rc4-syzkaller-00049-gb4911fb0b060 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ================================================================== EXT4-fs error (device loop0) in ext4_process_orphan:347: Corrupt filesystem EXT4-fs (loop0): 1 truncate cleaned up EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 ro without journal. Quota mode: writeback. smc: net device bond0 erased user defined pnetid SYZ2