CVE-2023-53247 btrfs: set_page_extent_mapped after read_folio in btrfs_cont_expand

In the Linux kernel, the following vulnerability has been resolved: btrfs: setpageextentmapped after readfolio in btrfscontexpand While trying to get the subpage blocksize tests running, I hit the following panic on generic/476 assertion failed: PagePrivatepage && page-private, in...