syzbot

loop2: detected capacity change from 0 to 4096
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BUG: KMSAN: uninit-value in ntfs_iomap_begin+0x8a3/0x1550 fs/ntfs3/inode.c:781
 ntfs_iomap_begin+0x8a3/0x1550 fs/ntfs3/inode.c:781
 iomap_iter+0x9d9/0x14f0 fs/iomap/iter.c:110
 iomap_read_folio+0x67c/0xb20 fs/iomap/buffered-io.c:645
 ntfs_read_folio+0x74f/0x770 fs/ntfs3/inode.c:652
 filemap_read_folio mm/filemap.c:2510 [inline]
 do_read_cache_folio+0x96d/0x13d0 mm/filemap.c:4140
 do_read_cache_page mm/filemap.c:4206 [inline]
 read_cache_page+0x63/0x1e0 mm/filemap.c:4215
 read_mapping_page include/linux/pagemap.h:1009 [inline]
 inode_read_data+0xbb/0x560 fs/ntfs3/inode.c:1058
 ntfs_fill_super+0x720c/0x8820 fs/ntfs3/super.c:1582
 get_tree_bdev_flags+0x6ef/0x930 fs/super.c:1634
 get_tree_bdev+0x38/0x50 fs/super.c:1657
 ntfs_fs_get_tree+0x35/0x40 fs/ntfs3/super.c:1819
 vfs_get_tree+0xae/0x5d0 fs/super.c:1694
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3765 [inline]
 do_new_mount+0x885/0x1dc0 fs/namespace.c:3841
 path_mount+0x7a2/0x20a0 fs/namespace.c:4161
 do_mount fs/namespace.c:4174 [inline]
 __do_sys_mount fs/namespace.c:4390 [inline]
 __se_sys_mount+0x704/0x7f0 fs/namespace.c:4367
 __x64_sys_mount+0xed/0x180 fs/namespace.c:4367
 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+0x15d/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable lcn created at:
 ntfs_iomap_begin+0x157/0x1550 fs/ntfs3/inode.c:742
 iomap_iter+0x9d9/0x14f0 fs/iomap/iter.c:110

CPU: 0 UID: 0 PID: 5870 Comm: syz.2.15 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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