Re: ERROR: found multixact from before relminmxid

2018-04-09 23:51 GMT-03:00 Peter Geoghegan <pg(at)bowt(dot)ie>:
> On Mon, Apr 9, 2018 at 6:56 PM, Alexandre Arruda <adaldeia(at)gmail(dot)com> wrote:
>> (... and all other indexes returns null too)
>>
>> I tried with bt_index_check too. Same results.
>
> That's interesting, because it tells me that you have a table that
> appears to not be corrupt, despite the CLUSTER error. Also, the error
> itself comes from sanity checking added to MultiXact freezing fairly
> recently, in commit 699bf7d0.
>
> You didn't say anything about regular VACUUM being broken. Do you find
> that it works without any apparent issue?
>
> I have a suspicion that this could be a subtle bug in
> CLUSTER/freezing. The only heap_freeze_tuple() caller is code used by
> CLUSTER, so it's not that hard to imagine a MultiXact freezing bug
> that is peculiar to CLUSTER. Though I haven't thought about it in much
> detail.
>
> --
> Peter Geoghegan

Hi Peter,

Actualy, I first notice the problem in logs by autovacuum:

2018-04-10 08:22:15.385 -03 [55477] CONTEXT: automatic vacuum of
table "production.public.fn06t"
2018-04-10 08:22:16.815 -03 [55477] ERROR: found multixact 68834765
from before relminmxid 73262006

production=# vacuum analyze verbose fn06t;
INFO: vacuuming "public.fn06t"
ERROR: found multixact 76440919 from before relminmxid 122128619