Rare segfault when preparing request working with a table with triggers
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Key: CORE-5428
URL: http://tracker.firebirdsql.org/browse/CORE-5428
Project: Firebird Core
Issue Type: Bug
Components: Engine
Affects Versions: 3.0.1, 2.5.6, 3.0.0, 4.0 Initial, 2.5.5, 2.5.4, 2.5.3
Update 1, 2.1.7, 2.5.3, 2.5.2 Update 1, 2.5.2, 2.5.1, 2.5.0
Environment: Classic server
Reporter: Alexander Peshkov
This old and rarely happening bug happens when structure of a table with
triggers is modified (DDL) when other attachment is preparing request working
with that table. AST by itself does not cause any harm to data structures but
rescan of table's metadata (which happens on any call to metadata cache for
given table) drops old triggers description and creates new one. But in some
cases pointers to old triggers are cached by request compiler and next use of
them makes classic server process die.
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