Three tests added in #6220 use the /sys/kernel/address_bits file on Linux (test_cp_default_virtual_file(), test_cp_debug_sparse_always_sparse_virtual_file(), and test_cp_debug_default_sparse_virtual_file()). This file was only added a year ago, so those tests are failing on any distro with a kernel older than that. E.g., I don't have that file on Debian 12 (bookworm). @AnirbanHalder654322, is there anything special about this file (other than being virtual) for those tests, and if so, are there any other older files that could be used instead?