> On March 25, 2020 1:39 PM Sergio Lopez <s...@redhat.com> wrote: > > > On Wed, Mar 25, 2020 at 01:29:48PM +0100, Dietmar Maurer wrote: > > > As expected, if both BDS are running on the same IOThread (and thus, > > > the same AioContext), the problem is not reproducible. > > > > > > In a general sense, we could say that completion modes other than > > > "individual" are not supported for a transaction that may access > > > different AioContexts. I don't see a safe an easy way to fix this. We > > > could opt for simply detect and forbid such completion modes when the > > > BDS's are assigned to different AioContexts. Perhaps Kevin (in CC) has > > > a better idea. > > > > So the solution is to disable backups when using io-threads? > > > > I meant forbidding transactions with completion-mode == grouped. It > would be still possible running transactions (and thus, backups) with > completion-mode == individual, which is the default.
As mentioned earlier, even a totally simple/normal backup job fails when using io-threads and the VM is under load. It results in a total VM freeze!