Dirty page could be written without releasing (or downgrading) page lock. It
results in "lock denied" or "lock conversion denied" bugcheck
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Key: CORE-3464
URL: http://tracker.firebirdsql.org/browse/CORE-3464
Project: Firebird Core
Issue Type: Bug
Components: Engine
Affects Versions: 2.1.4, 2.5.0, 2.0.6, 1.5.6, 2.1.3, 2.1.2, 2.0.5, 2.1.1,
2.0.4, 2.1.0
Environment: Classic Server or Super Classic architectures
Reporter: Vlad Khorsun
Race condition occured when CCH_flush(FLUSH_ALL) is writting page buffer and at
the same time blocking AST is marked this buffer as BDB_blocking. When buffer
is released after write it didn't checked bdb_ast_flag and page lock is not
released. Another process received deadlock and is bugged with bugcheck 215 or
216.
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