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tests/TC149-vnode-pager-real-faults.md

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+# 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.