d30e87ea49
uid_range_partition() filled the grown entries[] buffer backwards in
place. The backward-fill invariant (the write cursor stays above the
read index) only holds when every source entry contributes at least
one partition; an entry with nr < size contributes zero, so the cursor
stalls while the read index keeps descending. A later multi-part
entry's writes then overwrite the still-live zero-part slot, the
corrupted slot is re-read as a one-part entry, and the next
range->entries[--t] underflows.
Add a forward compaction first pass that drops the zero-part entries
before the backward fill.
Follow-up for 025439faaa
Co-Authored-by: Paul Meyer <katexochen0@gmail.com>
System and Service Manager
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