(Not a) CHECKDB error “Unable to deallocate a kept page”

[Edit 2014: there’s an additional bug in SQL Server 2012/2014 – see this post for details.]

Msg 831, Level 20, State 1, Line 1
Unable to deallocate a kept page.

More details are in KB article 919142, which was only recently made public.

4 thoughts on “(Not a) CHECKDB error “Unable to deallocate a kept page”

  1. Hi Lads,

    I meet this issues on SQL Server 2012 with AGs.
    No fun at all.
    Please find err logs below.

    Should I contact to Microsoft directly ?


    During undoing of a logged operation in database ‘databaseName’, an error occurred at log record ID (26946:8958:47). Typically, the specific failure is logged previously as an error in the Windows Event Log service. Restore the database or file from a backup, or repair the database.

    Unable to deallocate a kept page.

    SQL Server must shut down in order to recover a database (database ID 21). The database is either a user database that could not be shut down or a system database. Restart SQL Server. If the database fails to recover after another startup, repair or restore the database.

  2. I also met the same error as Jakub this weekend on a SQL 2012 SP1 (11.0.3349).
    Any chance on “hoping” this bug was reintroduced by any chance?

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