Re: BUG #16129: Segfault in tts_virtual_materialize in logical replication worker

On Thu, Nov 21, 2019 at 07:45:34PM -0500, Tom Lane wrote:
> =?utf-8?Q?Ond=C5=99ej?= Jirman <ienieghapheoghaiwida(at)xff(dot)cz> writes:
> > On Thu, Nov 21, 2019 at 11:08:54PM +0100, Tomas Vondra wrote:
> >> 1) Print newtup.values and newtup.changed matches, so that we can check
> >> it contains the tuple I shared before? There should be 8 elements in
> >> each, with 'values' being values formatted as text, and 'changed' being
> >> flags which values were updated.
>
> > newtup.changed
>
> > {true, true, false, true, true, true, true, true, false <repeats 1656 times>}
>
> So column 3 is not getting replaced. That seems to jibe with my
> theory that slot_modify_cstrings is failing to handle that case
> correctly. Can you try applying the patch I posted and see if
> it fixes the issue for you?

With the patch the replication resumes, without a crash.

confirmed_flush_lsn is now same for all my replication slots.

thank you and regards,
o.

> regards, tom lane