Re: BUG #17268: Possible corruption in toast index after reindex index concurrently

On Thu, Nov 4, 2021 at 3:07 AM Peter Geoghegan <pg(at)bowt(dot)ie> wrote:
>
> On Wed, Nov 3, 2021 at 3:26 AM PG Bug reporting form
> <noreply(at)postgresql(dot)org> wrote:
> > it turns out one entry in toast index (?) was corrupted:
> > select md5(body) from zz where id = ...;
> > ERROR: missing chunk number 0 for toast value 4040061139 in
> > pg_toast_2624976286
> >
> > According to "created_at" column in linked table row was created at
> > "2021-11-02 13:04:22.192125", i.e. during reindex concurrently.
>
> I wonder if it's a coincidence that that number (~4.04 billion) is not
> that far from 2^32-1 (~4.294 billion).
>
> Can you run amcheck? Perhaps the output of the following will be interesting:
>
> create extension amcheck;
> set client_min_messages=debug1;
> select bt_index_check('pg_toast.pg_toast_2624976286_index', true);
>
> (Couldn't hurt to try it, at least.)

Hi Peter,

Please see a result of amcheck

select bt_index_check('pg_toast.pg_toast_2624976286_index', true);
DEBUG: verifying consistency of tree structure for index
"pg_toast_2624976286_index"
DEBUG: verifying level 3 (true root level)
DEBUG: verifying level 2
DEBUG: verifying level 1
DEBUG: verifying level 0 (leaf level)
DEBUG: leaf block 715360 of index "pg_toast_2624976286_index" has no
first data item
DEBUG: verifying that tuples from index "pg_toast_2624976286_index"
are present in "pg_toast_2624976286"
ERROR: heap tuple (59561917,1) from table "pg_toast_2624976286" lacks
matching index tuple within index "pg_toast_2624976286_index"
HINT: Retrying verification using the function
bt_index_parent_check() might provide a more specific error.

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Maxim Boguk
Senior Postgresql DBA
https://dataegret.com/

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