=====================================================
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_dio_rw+0x2841/0x37e0 fs/iomap/direct-io.c:803
 iomap_dio_rw+0x5d/0x180 fs/iomap/direct-io.c:898
 ntfs_file_read_iter+0x1083/0x13b0 fs/ntfs3/file.c:875
 copy_splice_read+0xa01/0x1160 fs/splice.c:362
 do_splice_read fs/splice.c:979 [inline]
 splice_direct_to_actor+0x787/0x1560 fs/splice.c:1084
 do_splice_direct_actor fs/splice.c:1202 [inline]
 do_splice_direct+0x1e0/0x350 fs/splice.c:1228
 do_sendfile+0xa1c/0x1140 fs/read_write.c:1371
 __do_sys_sendfile64 fs/read_write.c:1432 [inline]
 __se_sys_sendfile64+0x1ea/0x290 fs/read_write.c:1418
 __x64_sys_sendfile64+0xbd/0x130 fs/read_write.c:1418
 x64_sys_call+0x3aa4/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:41
 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: 6963 Comm: syz.1.423 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
=====================================================