Attempt to read after the end of file when nbackup state is stalled
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Key: CORE-3468
URL: http://tracker.firebirdsql.org/browse/CORE-3468
Project: Firebird Core
Issue Type: Bug
Components: Engine
Affects Versions: 2.1.4, 2.5.0, 2.0.6, 2.1.3, 2.1.2, 2.0.5, 2.1.1, 2.0.4,
2.1.0
Environment: SuperServer
Reporter: Vlad Khorsun
When relation is extended new page is allocated (and faked) and passed into
DPM\extend_relation() function.
Then it is released, and free slot on some pointer page is searched.
When free slot is found just allocated page is fetched again and linked into
pointer page.
When nbackup state is stalled database file pre-allocation feature is disabled
to left database file in consistent
state while it is copied for backup purpose. Therefore new pages could be
allocated after end of database file.
As all new pages will be written into delta and later merged back into database
file this is OK.
The issue is that new data page buffer could be evicted from page cache after
it was released at the start of
extend_relation(). When page is fetched again it should be read from disk. In
stalled state page first reads
from delta. Delta have preallocated space and read succeeds. As page was never
written its image contains
zero's only. In this case attempt to read page from database file is performed.
Here we have IO read error : attempt to read after the end of file.
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