2a23a4e1159c to 6.12

2a23a4e1159c to 6.12

[Alistair Delva]

Dear stable maintainers,

Please consider cherry-picking 2a23a4e1159c ("kvm:
retrynx_huge_page_recovery_thread creation") to 6.12. It fixes
a problem where some VMMs (crosvm, firecracker, others) may
unnecessarily terminate a VM when -ENOMEM is returned to
userspace for a non-fatal condition.

Report of the change's success on 6.12 and first request:
https://lore.kernel.org/all/aBOPWGPTCgnUgtw-@CMGLRV3/

Example downstream bug report from libkrun:
https://github.com/containers/libkrun/issues/314

We are seeing this same flaky behavior at scale on infra
machines running 6.12.38 from Debian bpo.

Thanks!

Re: 2a23a4e1159c to 6.12

[Greg Kroah-Hartman]

On Tue, Aug 19, 2025 at 03:00:25PM -0700, Alistair Delva wrote:
> Dear stable maintainers,
> 
> Please consider cherry-picking 2a23a4e1159c ("kvm:
> retrynx_huge_page_recovery_thread creation") to 6.12. It fixes
> a problem where some VMMs (crosvm, firecracker, others) may
> unnecessarily terminate a VM when -ENOMEM is returned to
> userspace for a non-fatal condition.

That is not a valid commit in Linus's tree, are you sure it is correct?

thanks,

greg k-h

916b7f42b3b3 to 6.12 (was Re: 2a23a4e1159c to 6.12)

[Alistair Delva]

On Thu, Aug 21, 2025 at 11:32 PM Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
>
> On Tue, Aug 19, 2025 at 03:00:25PM -0700, Alistair Delva wrote:
> > Dear stable maintainers,
> >
> > Please consider cherry-picking 2a23a4e1159c ("kvm:
> > retrynx_huge_page_recovery_thread creation") to 6.12. It fixes
> > a problem where some VMMs (crosvm, firecracker, others) may
> > unnecessarily terminate a VM when -ENOMEM is returned to
> > userspace for a non-fatal condition.
>
> That is not a valid commit in Linus's tree, are you sure it is correct?

Sorry, the commit is actually 916b7f42b3b3.

> thanks,
>
> greg k-h

Re: 916b7f42b3b3 to 6.12 (was Re: 2a23a4e1159c to 6.12)

[Greg Kroah-Hartman]

On Fri, Aug 22, 2025 at 08:35:07AM -0700, Alistair Delva wrote:
> On Thu, Aug 21, 2025 at 11:32 PM Greg Kroah-Hartman
> <gregkh@linuxfoundation.org> wrote:
> >
> > On Tue, Aug 19, 2025 at 03:00:25PM -0700, Alistair Delva wrote:
> > > Dear stable maintainers,
> > >
> > > Please consider cherry-picking 2a23a4e1159c ("kvm:
> > > retrynx_huge_page_recovery_thread creation") to 6.12. It fixes
> > > a problem where some VMMs (crosvm, firecracker, others) may
> > > unnecessarily terminate a VM when -ENOMEM is returned to
> > > userspace for a non-fatal condition.
> >
> > That is not a valid commit in Linus's tree, are you sure it is correct?
> 
> Sorry, the commit is actually 916b7f42b3b3.
 
 Much better, now queued up.