Re: REFRESH MATERIALIZED VIEW command in PL block hitting Assert

On Mon, Apr 22, 2013 at 6:41 PM, Andres Freund <andres(at)2ndquadrant(dot)com>wrote:

> On 2013-04-22 18:35:04 +0530, Jeevan Chalke wrote:
> > Hi,
> >
> > I have observed that following sequence is causing server crash.
> >
> > CREATE MATERIALIZED VIEW temp_class_mv AS
> > SELECT * FROM pg_class
> > WITH NO DATA;
> >
> > CREATE OR REPLACE FUNCTION test_refresh_mv()
> > RETURNS int
> > AS $$
> > BEGIN
> > REFRESH MATERIALIZED VIEW temp_class_mv;
> > return 1;
> > END; $$ LANGUAGE plpgsql;
> >
> > SELECT test_refresh_mv();
> >
> >
> > I had a quick look over the crash and it is hitting following Assert in
> > spi.c:
> >
> > else if (IsA(stmt, RefreshMatViewStmt))
> > {
> > Assert(strncmp(completionTag,
> > "REFRESH MATERIALIZED VIEW ", 23) ==
> 0);
> > _SPI_current->processed = strtoul(completionTag + 23,
> > NULL, 10);
> > }
> >
> > It seems like we are missing expected value for completionTag in
> > ExecRefreshMatView()
>
> Possibly independent from this issue, but where did that 23 come from?
>

23 is also bogus here.
It should be 26 i.e. length of "REFRESH MATERIALIZED VIEW "

BTW, attached is the patch which works well for me, but need details review.

Thanks

> ISTM we're strtoul()ing "EW somenumber" here.
>
> Greetings,
>
> Andres Freund
>
> --
> Andres Freund http://www.2ndQuadrant.com/
> PostgreSQL Development, 24x7 Support, Training & Services
>

--
Jeevan B Chalke
Senior Software Engineer, R&D
EnterpriseDB Corporation
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