Re: v13: CLUSTER segv with wal_level=minimal and parallel index creation

At Mon, 07 Sep 2020 00:33:03 -0400, Tom Lane <tgl@sss.pgh.pa.us> wrote in 
> Justin Pryzby <pryzby@telsasoft.com> writes:
> > This is easily reproduced, at least on pg_attribute

Thanks for the repro.

> Yeah, duplicated here.  The assertion (not SIGSEGV) is in code
> added by c6b92041d, so it seems clearly an open issue for v13.
> 
> I did not check to see what happens in a non-assert build.

The cause is that the worker had received pending-sync entry correctly
but not never created a relcache entry for the relation using
RelationBuildDesc. So the rd_firstRelfilenodeSubid is not correctly
set.

I'm investigating it.

regards.

-- 
Kyotaro Horiguchi
NTT Open Source Software Center