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Don't try to examine S_ISLNK(st.st_mode) after a failed lstat(). It's undefined. Also, if the lstat() reported ENOENT, we do not wish that to be a hard error, but the code might nonetheless treat it as one (giving an entirely misleading error message, too) depending on luck-of-the-draw as to what S_ISLNK() returned. Don't throw error for ENOENT from rmdir(), either. (We're not really expecting ENOENT because we just stat'd the file successfully; but if we're going to allow ENOENT in the symlink code path, surely the directory code path should too.) Generate an appropriate errcode for its-the-wrong-type-of-file complaints. (ERRCODE_SYSTEM_ERROR doesn't seem appropriate, and failing to write errcode() around it certainly doesn't work, and not writing an errcode at all is not per project policy.) Valgrind noticed the undefined S_ISLNK result; the other problems emerged while reading the code in the area. All of this appears to have been introduced in 8f15f74a44f68f9c. Back-patch to 9.5 where that commit appeared.
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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.