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AJvYcCU5YtMucWWSevfPrZ9w4/XXlp5aQFwRPfbedxJPOxqkavOyYbdVqGTHvi3Zdyh/kM4J19a++kEZlJO977A=@vger.kernel.org X-Gm-Message-State: AOJu0YzH8zoS1MgRFGRztW1ZPqfCS1cIn/tSK+j21JnRpPhzJH85pWYu pRF47m1Q5Q4uZ/JYqLfd1bfLop0HxfRU2gMnZvKDCLEHaQIYW/vCsE9CinwqgPNbFwZpBjZoc5C 9HKj54lzaLsKWkLHlA8qL3A+KlX162eK/YIbmskJ5mR8uuH1SooOBnMwGNNY= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2290:b0:662:c6f1:9231 with SMTP id 006d021491bc7-679c424cd4amr3009829eaf.4.1771760011921; Sun, 22 Feb 2026 03:33:31 -0800 (PST) Date: Sun, 22 Feb 2026 03:33:31 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <699ae98b.050a0220.340abe.0d30.GAE@google.com> Subject: [syzbot] [ntfs3?] KMSAN: uninit-value in ntfs_iomap_begin From: syzbot To: almaz.alexandrovich@paragon-software.com, linux-kernel@vger.kernel.org, ntfs3@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: d79526b89571 Merge tag 'spi-fix-v7.0-merge-window' of git:.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17c90006580000 kernel config: https://syzkaller.appspot.com/x/.config?x=e9e76fdaa4072fa5 dashboard link: https://syzkaller.appspot.com/bug?extid=7be88937363ac7ab7bb0 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1016255a580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16197c02580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/9632d1edcebe/disk-d79526b8.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c9f69df31226/vmlinux-d79526b8.xz kernel image: https://storage.googleapis.com/syzbot-assets/54f77eae730c/bzImage-d79526b8.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/62ad4352d8b0/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7be88937363ac7ab7bb0@syzkaller.appspotmail.com loop0: detected capacity change from 0 to 4096 ntfs3(loop0): Different NTFS sector size (2048) and media sector size (512). ===================================================== BUG: KMSAN: uninit-value in ntfs_iomap_begin+0x8c0/0x1460 fs/ntfs3/inode.c:825 ntfs_iomap_begin+0x8c0/0x1460 fs/ntfs3/inode.c:825 iomap_iter+0x9b7/0x1540 fs/iomap/iter.c:110 iomap_read_folio+0x262/0x750 fs/iomap/buffered-io.c:587 ntfs_read_folio+0x74a/0x770 fs/ntfs3/inode.c:697 filemap_read_folio mm/filemap.c:2496 [inline] do_read_cache_folio+0x993/0x1470 mm/filemap.c:4096 do_read_cache_page mm/filemap.c:4162 [inline] read_cache_page+0x63/0x1e0 mm/filemap.c:4171 read_mapping_page include/linux/pagemap.h:1022 [inline] inode_read_data+0xb3/0x6b0 fs/ntfs3/inode.c:1116 ntfs_fill_super+0x6a24/0x7e50 fs/ntfs3/super.c:1549 get_tree_bdev_flags+0x6e6/0x920 fs/super.c:1694 get_tree_bdev+0x38/0x50 fs/super.c:1717 ntfs_fs_get_tree+0x35/0x40 fs/ntfs3/super.c:1788 vfs_get_tree+0xb3/0x5d0 fs/super.c:1754 fc_mount fs/namespace.c:1193 [inline] do_new_mount_fc fs/namespace.c:3760 [inline] do_new_mount+0x885/0x1dd0 fs/namespace.c:3836 path_mount+0x7a2/0x20b0 fs/namespace.c:4146 do_mount fs/namespace.c:4159 [inline] __do_sys_mount fs/namespace.c:4348 [inline] __se_sys_mount+0x704/0x7f0 fs/namespace.c:4325 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4325 x64_sys_call+0x39f0/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Local variable lcn created at: ntfs_iomap_begin+0x15d/0x1460 fs/ntfs3/inode.c:786 iomap_iter+0x9b7/0x1540 fs/iomap/iter.c:110 CPU: 1 UID: 0 PID: 6051 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 ===================================================== --- 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@googlegroups.com. 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