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We read blocks of data from files that we're backing up in chunks, some multiple of BLCKSZ for each read. If checksum verification fails, we then try rereading just the one block for which validation failed. If that block happened to be the first block of the chunk, and if the file was concurrently truncated to remove that block, then we'd reach a call to bbsink_archive_contents() with a buffer length of 0. That causes an assertion failure. As far as I can see, there are no particularly bad consequences if this happens in a non-assert build, and it's pretty unlikely to happen in the first place because it requires a series of somewhat unlikely things to happen in very quick succession. However, assertion failures are bad, so rearrange the code to avoid that possibility. Patch by me, reviewed by Michael Paquier. Discussion: http://postgr.es/m/CA+TgmoZ_fFAoU6mrHt9QBs+dcYhN6yXenGTTMRebZNhtwPwHyg@mail.gmail.com
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.