=== DF-0145 fix validation (patched kernel #1) ===
mount-count BEFORE:         18
mounted tmpfs, populated 300 uid chunks
mount-count AFTER populate: 319  (+301)
unmounted (vq_done now drains RB trees)
mount-count AFTER unmount:  18  (FIXED: back to baseline, all freed)

Baseline (unpatched #0): 218 -> 718 (populate) -> 717 (unmount, 499 LEAKED)