Segfault when cleaning metadata cache
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Key: CORE-4869
URL: http://tracker.firebirdsql.org/browse/CORE-4869
Project: Firebird Core
Issue Type: Bug
Components: Engine
Affects Versions: 2.5.4, 2.5.3 Update 1, 2.5.3
Reporter: Alexander Peshkov
An issue (as core dump) is initially reported by IbPhoenix.
Under some circumstances it may happen that prc_existence_lock is NULL when
cleaning metadata cache.
For example when obsolete procedure is scanned again in MET_procedure() any
error raised out of parse_procedure_blr() function will cause catch() block in
the end of function release and nullify prc_existence_lock, keeping old
prc_request present and setting no obsolete flag again.
This makes necessary check for lock's presence when cleanin cache.
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