Re: pg_upgrade seems a tad broken

Tom Lane wrote:
> I wrote:
> > I tried to do a pg_upgrade from 9.0.x to HEAD today.  The pg_upgrade run
> > went through without complaint, and I could start the postmaster, but
> > every connection attempt fails with 
> 
> > psql: FATAL:  could not read block 0 in file "base/11964/11683": read only 0 of 8192 bytes
> 
> > The database OID varies depending on which database I try to connect to,
> > but the filenode doesn't.  In the source 9.0 database, this relfilenode
> > belongs to pg_largeobject_metadata.  I'm not sure whether pg_upgrade
> > would've preserved relfilenode numbering, so that may or may not be a
> > useful hint as to where the problem is.  But in any case it's busted.
> 
> Closer investigation shows that in the new database, relfilenode 11683
> belongs to pg_class_oid_index, which explains why it's being touched
> during backend startup.  It is indeed of zero length, and surely should
> not be.  I can't resist the guess that something about the recently
> added hacks for pg_largeobject_metadata is not right.

FYI, I have reproduced the bug here --- researching the cause now.

--  Bruce Momjian  <bruce@momjian.us>        http://momjian.us EnterpriseDB
http://enterprisedb.com
 + It's impossible for everything to be true. +