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CVE-2024-41031 is a Linux kernel memory-management flaw in mm/filemap related to creation of PMD-sized page cache entries. On ARM64 systems using a 64 KB base page size, HPAGE_PMD_ORDER is 13, which can make the PMD-sized page cache larger than MAX_PAGECACHE_ORDER. In that configuration, the kernel may incorrectly attempt to create a PMD-sized page cache entry that cannot be supported by xarray, leading to a warning in xas_split_alloc() during page splitting and truncation paths. The provided trace shows the issue being reachable via fallocate on XFS, through xfs_file_fallocate() -> truncate_pagecache_range() -> truncate_inode_pages_range() -> truncate_inode_partial_folio() -> split_huge_page_to_list_to_order() -> xas_split_alloc(). The fix is to skip allocation of PMD-sized page cache when its size exceeds MAX_PAGECACHE_ORDER and fall back to the regular readahead/page-cache path.
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