Re: VM corruption on standby

On Thu, Sep 11, 2025 at 1:59 AM Thomas Munro <thomas(dot)munro(at)gmail(dot)com> wrote:
> On Thu, Sep 11, 2025 at 12:00 AM Andrey Borodin <x4mmm(at)yandex-team(dot)ru> wrote:
> > > On 10 Sep 2025, at 15:25, Alexander Korotkov <aekorotkov(at)gmail(dot)com> wrote:
> > > I believe we need some
> > > general solution. We might have a special kind of condition variable,
> > > a critical section condition variable, where both waiting and
> > > signaling must be invoked only in a critical section. However, I dig
> > > into our Latch and WaitEventSet, it seems there are too many
> > > assumptions about postmaster death. So, a critical section condition
> > > variable probably should be implemented on top of semaphore. Any
> > > thoughts?
> >
> > We want Latch\WaitEventSet, but for critical section. Is it easier to implement from scratch (from semaphores), or is it easier to fix and maintain existing Latch\WaitEventSet?
>
> FWIW I'm working on a patch set that kills all backends without
> releasing any locks when the postmaster exists. Then CVs and other
> latch-based stuff should be safe in this context. Work was
> interrupted by a vacation but I hope to post something in the nexts
> couple of days, over on that other thread I started...

Thank you!
I'm looking forward to see it!

------
Regards,
Alexander Korotkov
Supabase