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Parents and children of check-in [6806b9ec]

Additional changes in the pager and os interface layers to fix problems that might be contributing to recently observed database corruption. (CVS 3549) check-in: a593d574 user: drh tags: trunk
Make sure that the database size cache in the pager is invalidated whenever the database is unlocked. A stale value in the database size cache can result in database corruption on a heavily loaded system running autovacuum. (CVS 3548) check-in: 6806b9ec user: drh tags: trunk
Update the vtab_err test to check for -DSQLITE_MEMDEBUG=1 and skip the tests if missing. Pager is more careful to clear its file size cache. Remove an assert() in VDBE that might fail on a corrupt database file. (CVS 3547) check-in: bf1afd01 user: drh tags: trunk