erofs-freebsd-out-tree/tests/TC149-vnode-pager-real-faults.md

Test Case: Vnode Pager Real Faults

Test ID: TC149-vnode-pager-real-faults Category: VM Integration Priority: Critical

Objective

Exercise real sequential/randomized mmap faults, partial and full pages around EOF, read-only shared mappings, and private COW on plain and LZ4 EROFS data.

Procedure

On separate fresh mounts of vfs/vfs-plain.erofs and vfs/vfs-lz4.erofs:

./mmap_fault /tmp/repo22-g3/mnt/pager.bin

Expected Results

Both runs print the same 21211-byte logical FNV hash and pass six random page faults, sequential comparison, EOF zeroing, expected child SIGBUS, EACCES for writable MAP_SHARED, private COW, and EROFS for O_RDWR. The expected child SIGBUS dmesg line is evidence, not a kernel failure. Record hashes and cleanup.