Thomas Kellerer <spam_eater@xxxxxxx> writes: > Interesting enough, the same error message appears when I run "create extension xml2;" on Postgres 10. Sure, that no doubt is exactly the command getting issued during the pg_upgrade attempt. > It somehow looks as if there is a DLL dependency between XML2 and whatever uses pgxml.dll (the new xmltable perhaps?) pgxml.dll *is* the dll name for contrib/xml2. I'm suspicious that what you're seeing is some sort of binary-level incompatibility between BigSQL's build of contrib/xml2 and whatever version of libxml2 you have installed. Hard to guess more than that. If you're not actually using contrib/xml2 in the 9.6 installation, probably dropping that extension would let you do the upgrade. regards, tom lane -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general