Re: VM corruption on standby

> On 7 Aug 2025, at 17:09, Aleksander Alekseev <aleksander@tigerdata.com> wrote:
>
> If my understanding is correct, we should make a WAL record with the
> XLH_LOCK_ALL_FROZEN_CLEARED flag *before* we modify the VM but within
> the same critical section (in order to avoid race conditions within
> the same backend).

Well, the test passes because you moved injection point to a very safe position. I can't comment anything on other
aspectsof moving visibilitymap_clear() around. 
The approach seems viable to me, but I'd like to have understanding why PD_ALL_VISIBLE in a heap page header did not
savethe day before fixing anything. 


Best regards, Andrey Borodin.