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tests/TC050-dotdot-handling.md

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+# Test Case: Dotdot Entry Handling
+
+**Test ID**: TC050-dotdot-handling
+**Category**: Directory Operations
+**Priority**: High
+
+## Objective
+
+Verify dotdot is returned and resolves nested paths to the correct parent
+vnode without lock-order failure.
+
+## Procedure
+
+Mount vfs/vfs-plain.erofs and run:
+
+    ./readdir_probe /tmp/repo22-g3/mnt/parent/child 128
+    stat -f '%i %HT' /tmp/repo22-g3/mnt/parent
+    stat -f '%i %HT' /tmp/repo22-g3/mnt/parent/child/..
+    cmp fixtures/vfs/source/parent/file.txt \
+      /tmp/repo22-g3/mnt/parent/child/grandchild/../../file.txt
+
+## Expected Results
+
+The traversal contains one dotdot DT_DIR entry, both parent stat commands
+report the same NID, and multiple dotdot components reach the expected file.
+Record output, dmesg delta, and cleanup.