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tests/TC141-cold-nested-namei.md

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+# Test Case: Cold Nested Namei and Corruption
+
+**Test ID**: TC141-cold-nested-namei
+**Category**: Directory Lookup
+**Priority**: Critical
+
+## Objective
+
+Observe nested positive and missing lookup on fresh mounts, complete multi-
+block cookies, Linux-compatible padding, and stable EINTEGRITY for three
+structured directory corruptions.
+
+## Procedure
+
+On a fresh metadata/namei-base.erofs mount, make the first pathname operation:
+
+    ./g3_vfs_probe expect-success open-read \
+      /tmp/repo22-g3/mnt/alpha/bravo/charlie/payload.txt
+
+Compare the payload with the recorded source, require two direct missing
+lookups to return errno 2, and run:
+
+    ./readdir_probe /tmp/repo22-g3/mnt/wide 128
+
+Repeat the cold positive read and cookie probe on
+metadata/namei-padding-nonzero.erofs.
+
+Finally mount each corruption independently and issue two direct stat calls:
+
+| Image | Path | Expected errno |
+|---|---|---:|
+| namei-corrupt-short.erofs | /alpha | 97 |
+| namei-corrupt-nameoff.erofs | /alpha | 97 |
+| namei-corrupt-name.erofs | /wide/entry-077-abcdefghijklmnopqrstuvwxyz.txt | 97 |
+
+Run readdir_probe on the affected directory and require its direct syscall
+failure to report integrity failure. Unmount and detach between every image.
+
+## Expected Results
+
+Fresh positive lookup reads exact data; repeated missing lookup is ENOENT; both
+valid variants report all 322 restartable entries. Every corruption remains
+EINTEGRITY on both lookup attempts and readdir, without cache masking, panic,
+or hang. Record all five image hashes and cleanup.