| From: | Mark Dilger <mark(dot)dilger(at)enterprisedb(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Peter Geoghegan <pg(at)bowt(dot)ie>, "Andrey M(dot) Borodin" <x4mmm(at)yandex-team(dot)ru>, Stephen Frost <sfrost(at)snowman(dot)net>, Michael Paquier <michael(at)paquier(dot)xyz>, Amul Sul <sulamul(at)gmail(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: new heapcheck contrib module |
| Date: | 2020-10-22 20:26:41 |
| Message-ID: | 3CF77684-FA8D-4D63-AD95-DC4C9A2537E3@enterprisedb.com |
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| Lists: | pgsql-hackers |
> On Oct 22, 2020, at 1:09 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>
> ooh, looks like prairiedog sees the problem too. That means I should be
> able to reproduce it under a debugger, if you're not certain yet where
> the problem lies.
Thanks, Tom, but I question whether the regression test failures are from a problem in the verify_heapam.c code. I think they are a busted perl test. The test was supposed to corrupt the heap by overwriting a heap file with a large chunk of garbage, but in fact only wrote a small amount of garbage. The idea was to write about 2000 bytes starting at offset 32 in the page, in order to corrupt the line pointers, but owing to my incorrect use of syswrite in the perl test, that didn't happen.
I think the uninitialized variable warning is warning about a real problem in the c-code, but I have no reason to think that particular problem is causing this particular regression test failure.
—
Mark Dilger
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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