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The test creates a non-anonymous VMA (ptr_not_anon) via mmap() with MAP_PRIVATE but without MAP_ANONYMOUS, using fd=0 (stdin) as the file descriptor. This always fails because fd=0 is not a regular file, and the failure was hidden because ASSERT_NE() incorrectly checked for NULL instead of MAP_FAILED. Fix by using mkstemp() + ftruncate() to create a real temporary file, then mapping it with MAP_PRIVATE to obtain a genuine file-backed VMA. Also fix the mmap() error checks to use MAP_FAILED instead of NULL, and pass fd=-1 for the anonymous mapping for clarity. The temp file is unlinked immediately so it does not persist on disk. Link: https://lore.kernel.org/20260803103046.14324-1-hongfu.li@linux.dev Signed-off-by: Hongfu Li <lihongfu@kylinos.cn> Cc: Shuah Khan <shuah@kernel.org> Cc: Wei Yang <richard.weiyang@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>