Hello, syzbot found the following issue on: HEAD commit: e7ed34365879 Merge tag 'mailbox-v6.12' of git://git.kernel.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=11b54ea9980000 kernel config: https://syzkaller.appspot.com/x/.config?x=92da5062b0d65389 dashboard link: https://syzkaller.appspot.com/bug?extid=ef0d7bc412553291aa86 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14b7ed07980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=101dfd9f980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/66cc3d8c5c10/disk-e7ed3436.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c7769a88b445/vmlinux-e7ed3436.xz kernel image: https://storage.googleapis.com/syzbot-assets/c1fe4c6ee436/bzImage-e7ed3436.xz mounted in repro #1: https://storage.googleapis.com/syzbot-assets/2ab98c65fd49/mount_0.gz mounted in repro #2: https://storage.googleapis.com/syzbot-assets/7ffc0eb73060/mount_5.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ef0d7bc412553291aa86@xxxxxxxxxxxxxxxxxxxxxxxxx Buffer I/O error on dev loop4, logical block 34, lost sync page write FAT-fs (loop4): unable to read inode block for updating (i_pos 548) ===================================================== BUG: KMSAN: uninit-value in vfat_rename fs/fat/namei_vfat.c:1038 [inline] BUG: KMSAN: uninit-value in vfat_rename2+0x3dda/0x3de0 fs/fat/namei_vfat.c:1174 vfat_rename fs/fat/namei_vfat.c:1038 [inline] vfat_rename2+0x3dda/0x3de0 fs/fat/namei_vfat.c:1174 vfs_rename+0x1d9d/0x2280 fs/namei.c:5013 do_renameat2+0x18cc/0x1d50 fs/namei.c:5170 __do_sys_rename fs/namei.c:5217 [inline] __se_sys_rename fs/namei.c:5215 [inline] __x64_sys_rename+0xe8/0x140 fs/namei.c:5215 x64_sys_call+0x1e4d/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:83 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Local variable sinfo.i created at: vfat_rename fs/fat/namei_vfat.c:937 [inline] vfat_rename2+0x124/0x3de0 fs/fat/namei_vfat.c:1174 vfs_rename+0x1d9d/0x2280 fs/namei.c:5013 CPU: 1 UID: 0 PID: 5211 Comm: syz-executor818 Not tainted 6.11.0-syzkaller-12113-ge7ed34365879 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
