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During parallel index scans, if the current page to be read is deleted, we skip it and try to get the next page for a scan without releasing the buffer lock on the current page. To get the next page, sometimes it needs to wait for another process to complete its scan and advance it to the next page. Now, it is quite possible that the master backend has errored out before advancing the scan and issued a termination signal for all workers. The workers failed to notice the termination request during wait because the interrupts are held due to buffer lock on the previous page. This lead to all workers being stuck. The fix is to release the buffer lock on current page before trying to get the next page. We are already doing same in backward scans, but missed it for forward scans. Reported-by: Victor Yegorov Bug: 15290 Diagnosed-by: Thomas Munro and Amit Kapila Author: Amit Kapila Reviewed-by: Thomas Munro Tested-By: Thomas Munro and Victor Yegorov Backpatch-through: 10 where parallel index scans were introduced Discussion: https://postgr.es/m/153228422922.1395.1746424054206154747@wrigleys.postgresql.org |
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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/.