tar-1.14-2 reports "A lone zero block at" the end of almost all of my previously valid files. Reproducible for example with the following file: http://gd.tuwien.ac.at/infosys/servers/http/apache/dist/jakarta/commons/dbcp/binaries/commons-dbcp-1.2.1.tar.gz
I'm also able to reproduce this behaviour with latest Fedora Development, but the extraction was clean, maybe it's a packaging problem, because your listed file is the onliest file with the message "A lone zero block at" - all my other and older archives don't have that problem...
This was just an example, I am getting the same error message with at least the following files: antville-1.0.2.tar.gz, apache-ant-1.6.0-bin.tar.gz, cocoon-2.1.3-src.tar.gz, cocoon-2.1.4-src.tar.gz, commons-betwixt-1.0-alpha-1-src.tar.gz, commons-collections-3.1.tar.gz, commons-dbcp-1.2.1-src.tar.gz, commons-pool-1.2.tar.gz, dom4j-1.4.tar.gz, helma-1.3.1.tar.gz, i2c-2.6.4.tar.gz, jakarta-log4j-1.2.8.tar.gz, jakarta-taglibs-response-1.0.1.tar.gz, jakarta-tomcat-5.0.27-src.tar.gz, mysql-connector-java-3.0.10-stable.tar.gz, mysql-connector-java-3.1.0-alpha.tar.gz, resin-3.0.8-src.tar.gz, resin-3.0.8.tar.gz, resin-3_0-snap-src.tar.gz, resin-3_0-snap.tar.gz, smppapi-0.3.2.tar.gz, soap-src-2.3.1.tar.gz, xalan-j-current-bin.tar.gz, Xerces-J-bin.2.6.2.tar.gz However the extraction seems to be clean, this is why I wrote "spurious" in the summary.
Apparently harmless warning: http://lists.gnu.org/archive/html/bug-tar/2004-03/msg00027.htm