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When the next poll slot was occupied, fpm_event_poll_add() registered the fd in the first free slot found by the search but stored the occupied index in the event. fpm_event_poll_wait() then compared the event fd against the wrong pollfd entry and skipped the event, so with catch_workers_output the master did not read a replacement worker's output while it ran. Store the slot actually used and advance the hint from it.
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Promoted upstream as php#25289. |
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When worker replacement leaves the next poll slot occupied, FPM registers a descriptor in a different free slot but keeps the occupied index. The poll backend now records the slot it used, so readiness dispatch continues capturing worker output. Direct insertion and both removal paths already use the matching slot.
Found during code review and reproduced with PHP 8.4 FPM on Linux. The regression requires Linux's pipe-EOF ordering to exercise slot search. The separate queue traversal defect is handled in php#25154.