pg_upgrade fails with an unspecified error I’m running Postgres 9.1’s pg_ugrade to migrate from 9.0 to 9.1 on Windows x64. After editing the permissions to allow full trust, running the tool as the postgres user, and working around a bug whereby pg_upgrade leaves the "old" store locked and refusing to run again ("there seems to be a postmaster servicing old cluster"), it now fails without explaining what’s wrong:

Performing Consistency Checks
-----------------------------
Checking current, bin, and data directories                 ok
Checking cluster versions                                   ok
Checking database user is a superuser                       ok
Checking for prepared transactions                          ok
Checking for reg* system oid user data types                ok
Checking for contrib/isn with bigint-passing mismatch       ok
Creating catalog dump                                       ok

There were problems executing ""C:\Progs\Postgres\9.0\bin/pg_ctl" -w -l "nul" -D "C:\Progs\Postgres\9.0-data"  stop &gt;&gt; "nul" 2&gt;&amp;1"

Failure, exiting


Is this tool production-ready or am I wasting my time? If this is what I should be doing, what are your suggestions for solving the current failure?
Basically pg_upgrade is production ready. 

Unfortunately the early builds of 9.1 had some bugs related to pg_upgrade and Windows. These were fixed in 9.1.3 as far as I know.