Re: libpq debug log

From: "'alvherre(at)alvh(dot)no-ip(dot)org'" <alvherre(at)alvh(dot)no-ip(dot)org>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: "iwata(dot)aya(at)fujitsu(dot)com" <iwata(dot)aya(at)fujitsu(dot)com>, "tsunakawa(dot)takay(at)fujitsu(dot)com" <tsunakawa(dot)takay(at)fujitsu(dot)com>, 'Kyotaro Horiguchi' <horikyota(dot)ntt(at)gmail(dot)com>, "k(dot)jamison(at)fujitsu(dot)com" <k(dot)jamison(at)fujitsu(dot)com>, "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: libpq debug log
Date: 2021-03-31 22:14:28
Message-ID: 20210331221428.GA27517@alvherre.pgsql
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On 2021-Mar-31, 'alvherre(at)alvh(dot)no-ip(dot)org' wrote:

> .. oh, I think we forgot to set conn->Pfdebug = NULL when creating the
> connection. So when we do PQtrace(), the first thing it does is
> PQuntrace(), and then that tries to do fflush(conn->Pfdebug) ---> crash.
> So this should fix it.

I tried to use MALLOC_PERTURB_ to prove this theory, but I failed at it.
I'll just push this blind and see what happens.

Álvaro Herrera 39°49'30"S 73°17'W
"Someone said that it is at least an order of magnitude more work to do
production software than a prototype. I think he is wrong by at least
an order of magnitude." (Brian Kernighan)

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