Two different CLOBBER_CACHE_ALWAYS critters recently reported exactly the same failure pattern on HEAD: http://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=markhor&dt=2015-02-06%2011%3A59%3A59 http://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=tick&dt=2015-02-12%2010%3A22%3A57 I'd say we have a problem. I'd even go so far as to say that somebody has completely broken locking, because this looks like autovacuum and manual vacuuming are hitting the same table at the same time. regards, tom lane
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