Re: REFRESH MATERIALIZED VIEW command in PL block hitting Assert

On Mon, Apr 22, 2013 at 6:41 PM, Andres Freund <andres@2ndquadrant.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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