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Previously, the code pointed the standard process-termination signals to postgres.c's die(). That would typically result in an attempt to execute a transaction abort, which is not possible in bootstrap mode, leading to PANIC. This choice seems to be a leftover from an old code structure in which the same signal-assignment code was used for many sorts of auxiliary processes, including interactive standalone backends. It's not very sensible for bootstrap mode, which has no interest in either interactivity or continuing after an error. We can get better behavior with less effort by just letting normal process termination happen, after which the parent initdb process will clean up. This is basically cosmetic in any case, since initdb will react the same way whether bootstrap dies on a signal or abort(). Given the lack of previous complaints, I don't feel a need to back-patch, even though the behavior is old. Discussion: https://postgr.es/m/3850b11a.5121.16aaf827e4a.Coremail.thunder1@126.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/.