Re: invalid memory alloc request size from pg_stat_activity?

James Tomson <james(at)pushd(dot)com> writes:
> We're upgrading from postgresql 9.6 to 10.6 and everything is working fine, but any query against pg_stat_activity results in ERROR: invalid memory alloc request size 1652113408

> e.g:

> ourdb=> SELECT pid, state, age(query_start, clock_timestamp()), usename, query FROM pg_stat_activity WHERE query != '<IDLE>' AND state != 'idle' ORDER BY age limit 100;
> ERROR: invalid memory alloc request size 1652113408

That seems odd ...

> Maybe this has to do with us setting track_activity_query_size=102400?

It wouldn't surprise me if reading pg_stat_activity causes allocation of
track_activity_query_size * max_connections bytes, but unless you also
have max_connections set to some pretty insane value, that wouldn't
be enough to fit this observation.

Did you have these parameters set differently in 9.6?

regards, tom lane