Re: Allow non-superuser to cancel superuser tasks.

> On 21 Jun 2024, at 09:01, Michael Paquier <michael@paquier.xyz> wrote:
> 
> On Fri, Jun 14, 2024 at 12:06:36PM +0500, Andrey M. Borodin wrote:
>> I’ve tried to dig into the test.
>> The problem is CV is allocated in
>> 
>> inj_state = GetNamedDSMSegment("injection_points”,
>> 
>> which seems to be destroyed in
>> 
>> shmem_exit() calling dsm_backend_shutdown()
>> 
>> This happens before we broadcast that sleep is over.
>> I think this might happen with any wait on injection point if it is
>> pg_terminate_backend()ed.
> 
> Except if I am missing something, this is not a problem for a normal
> backend, for example with one using a `SELECT injection_points_run()`.

Yes, i’ve tried to get similar error in other CV-sleeps and in injection points of normal backend - everything works just fine. The error is specific to just this test.

>> Is there way to wake up from CV sleep before processing actual termination?
> 
> I am honestly not sure if this is worth complicating the sigjmp path
> of the autovacuum worker just for the sake of this test.  It seems to
> me that it would be simple enough to move the injection point
> autovacuum-worker-start within the transaction block a few lines down
> in do_autovacuum(), no?

Thanks for the pointer, I’ll try this approach!


Best regards, Andrey Borodin,