Re: [PORTS] Port Bug Report: calling notify in pl/pgsql proc causes core dump

From: Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us>
To: David Mansfield <david(at)cobite(dot)com>
Cc: pgsql-ports(at)postgreSQL(dot)org
Subject: Re: [PORTS] Port Bug Report: calling notify in pl/pgsql proc causes core dump
Date: 1999-09-21 21:29:32
Message-ID: 199909212129.RAA20689@candle.pha.pa.us
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Can someone comment on this?

>
> >
> > Jan, this is yours.
> >
>
> Actually, I made a 'workaround' fix to this problem (after posting this
> bug report). I'll append the patch. I don't pretend to understand the
> internals of this system, but my guess is that a simple statement like
> 'notify xyz' went through the planner, got an spi_plan, but the 'plan
> list' was empty. So here's my patch, which may be fixing a symptom, not
> the cause, YMMV:
>
> --- pl_exec.c~ Wed May 26 03:07:39 1999
> +++ pl_exec.c Fri Jun 25 11:00:53 1999
> @@ -2482,6 +2482,10 @@
>
> plan = (Plan *) lfirst(spi_plan->ptlist);
>
> + /* it would seem as though plan can be null... --DAVID */
> + if (plan == NULL)
> + return;
> +
> /* ----------
> * 2. It must be a RESULT plan --> no scan's required
> * ----------
>
>
> >
> > >
> > > ============================================================================
> > > POSTGRESQL BUG REPORT TEMPLATE
> > > ============================================================================
> > >
> > >
> > > Your name : David Mansfield
> > > Your email address : david(at)cobite(dot)com
> > >
> > > Category : runtime: back-end
> > > Severity : serious
> > >
> > > Summary: calling notify in pl/pgsql proc causes core dump
> > >
> > > System Configuration
> > > --------------------
> > > Operating System : Linux 2.2.9
> > >
> > > PostgreSQL version : 6.5
> > >
> > > Compiler used : gcc 2.7.2.3
> > >
> > > Hardware:
> > > ---------
> > > RedHat 5.2
> > >
> > > Versions of other tools:
> > > ------------------------
> > > RedHat 5.2 standard
> > >
> > > --------------------------------------------------------------------------
> > >
> > > Problem Description:
> > > --------------------
> > > calling notify in pl/pgsql proc causes core dump
> > >
> > > --------------------------------------------------------------------------
> > >
> > > Test Case:
> > > ----------
> > > createdb bugs
> > > psql bugs
> > > \i /usr/src/postgresql-6.5/src/pl/plpgsql/src/mklang.sql
> > > create function a_func()
> > > returns
> > > char
> > > as
> > > 'begin
> > > notify my_listen;
> > > return \'a\';
> > > end;'
> > > language
> > > 'plpgsql'
> > > ;
> > > select a_func();
> > >
> > >
> > > --------------------------------------------------------------------------
> > >
> > > Solution:
> > > ---------
> > >
> > >
> > > --------------------------------------------------------------------------
> > >
> > >
> > >
> >
> >
> >
>
> --
> /==============================\
> | David Mansfield |
> | david(at)cobite(dot)com |
> \==============================/
>
>

--
Bruce Momjian | http://www.op.net/~candle
maillist(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
+ Christ can be your backup. | Drexel Hill, Pennsylvania 19026

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