Re: "PANIC: could not open critical system index 2662" - twice

On 4/05/2023 6:42 pm, Laurenz Albe wrote:
> On Thu, 2023-05-04 at 15:49 +0000, Evgeny Morozov wrote:
>> Well, the problem happened again! Kind of... This time PG has not
>> crashed with the PANIC error in the subject, but pg_dumping certain DBs
>> again fails with
>>
>>
>> pg_dump: error: connection to server on socket
>> "/var/run/postgresql/.s.PGSQL.5434" failed: FATAL:  index
>> "pg_class_oid_index" contains unexpected zero page at block 0
> If you dumped and restored the database after the last time the error
> happened, there must be a systemic problem.

I dumped and restored the "real" databases I cared about. The tests
databases on which error now happens are new (created 2 days ago).

> Perhaps you have bad hardware, or a problem with a storage driver,
> file system or some other low-level software component.
> It might of course be a PostgreSQL bug too, but it is hard to say
> without a way to reproduce...

I'm now thinking of setting up a dedicated AWS EC2 instance just for
these little DBs that get created by our automated tests. If the problem
happens there as well then that would strongly point towards a bug in
PostgreSQL, wouldn't it? (And if nothing else, at least it won't affect
the more important DBs!)

Meanwhile, what do I do with the existing server, though? Just try to
drop the problematic DBs again manually?