There are a variety of log lines in hhvm.log like the following:
```
Oct 7 01:49:52 mw1229: SlowTimer [10672ms] at runtime/ext_mysql: slow query: SELECT /* ApiQueryRevisions::run 10.64.16.151 */ rev_id,rev_page,rev_text_id,rev_timestamp,rev_comment,rev_user_text,rev_user,rev_minor_edit,rev_deleted,rev_len,rev_parent_id,rev_sha1,rev_content_format,rev_content_model,page_namespace,page_title,page_id,page_latest,page_is_redirect,page_len,user_name FROM `revision` INNER JOIN `page` ON ((page_id = rev_page)) LEFT JOIN `user` ON ((rev_user != 0) AND (user_id = rev_user)) WHERE (page_latest=rev_id) AND page_id IN 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AND rev_page IN 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2015-10-07 01:49:52 mw1114 enwiki CirrusSearchRequests DEBUG: full_text search for 'Basque language' against enwiki_content took 81 millis and 77 Elasticsearch millis. Found 6817 total results and returned 21 of them starting at 0. Requested via api for ec22dabea47a3bf88085eb86351dd9f5 by executor 1579913454 {"queryType":"full_text","query":"Basque language","tookMs":81,"source":"api","executor":1579913454,"identity":"ec22dabea47a3bf88085eb86351dd9f5","index":"enwiki_content","elasticTookMs":77,"hitsTotal":6817,"hitsReturned":21,"hitsOffset":0}
```
This transitions from the previous log line (SlowTimer) to the new log line (CirrusSearchRequests) at exactly 8092 bytes. If i had to guess udp2log is probably overflowing?