From: | Ondřej Jirman <ienieghapheoghaiwida(at)xff(dot)cz> |
---|---|
To: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
Cc: | pgsql-bugs(at)lists(dot)postgresql(dot)org |
Subject: | Re: BUG #16129: Segfault in tts_virtual_materialize in logical replication worker |
Date: | 2019-11-21 16:35:06 |
Message-ID: | 20191121163506.pfe4u3jinrjdodtx@core.my.home |
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Lists: | pgsql-bugs |
On Thu, Nov 21, 2019 at 05:09:06PM +0100, Tomas Vondra wrote:
> On Thu, Nov 21, 2019 at 04:57:07PM +0100, Ondřej Jirman wrote:
> > On Thu, Nov 21, 2019 at 04:27:32PM +0100, Tomas Vondra wrote:
> > > On Thu, Nov 21, 2019 at 04:07:16PM +0100, Ondřej Jirman wrote:
> > > > I've also managed to get valgrind output on the segfaulting process:
> > > >
> > > > https://megous.com/dl/tmp/valgrind-105524-109020.log
> > > >
> > > > Though it probably doesn't show much new.
> > > >
> > >
> > > Is postgres actually compiled with valgrind support? What does pg_config
> > > say?
> >
> > I don't see any valgrind related options in configure --help, I repackaged it
> > just with CFLAGS set to -ggdb -Og.
> >
>
> You need to use -DUSE_VALGRIND or edit pg_config_manual.h. I usually
> just use
>
> CFLAGS="-DRANDOMIZE_ALLOCATED_MEMORY -DUSE_VALGRIND -O0 -ggdb"
>
> which does the trick. Without the USE_VALGRIND defined, we don't include
> the valgrind instrumentation, so I suppose the previous results are bogus.
Two new valgrind logs, now with -DUSE_VALGRIND:
https://megous.com/dl/tmp/valgrind-172090.log
https://megous.com/dl/tmp/valgrind-172143.log
A lots of uninitialized 1b accesses around VARATT_IS_EXTERNAL_EXPANDED.
So slot->tts_values[natt] is probably uninitialized.
Which is why the backtrace had a weird value there, I guess.
regards,
o.
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