Re: [Xen-devel] Xen crash after S3 suspend - Xen 4.13

[Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

On Mon, Mar 23, 2020 at 01:09:49AM +0100, Marek Marczykowski-Górecki wrote:
> On Thu, Mar 19, 2020 at 01:28:10AM +0100, Dario Faggioli wrote:
> > [Adding Juergen]
> > 
> > On Wed, 2020-03-18 at 23:10 +0100, Marek Marczykowski-Górecki wrote:
> > > On Wed, Mar 18, 2020 at 02:50:52PM +0000, Andrew Cooper wrote:
> > > > On 18/03/2020 14:16, Marek Marczykowski-Górecki wrote:
> > > > > Hi,
> > > > > 
> > > > > In my test setup (inside KVM with nested virt enabled), I rather
> > > > > frequently get Xen crash on resume from S3. Full message below.
> > > > > 
> > > > > This is Xen 4.13.0, with some patches, including "sched: fix
> > > > > resuming
> > > > > from S3 with smt=0".
> > > > > 
> > > > > Contrary to the previous issue, this one does not happen always -
> > > > > I
> > > > > would say in about 40% cases on this setup, but very rarely on
> > > > > physical
> > > > > setup.
> > > > > 
> > > > > This is _without_ core scheduling enabled, and also with smt=off.
> > > > > 
> > > > > Do you think it would be any different on xen-unstable? I cat
> > > > > try, but
> > > > > it isn't trivial in this setup, so I'd ask first.
> > > > > 
> > Well, Juergen has fixed quite a few issues.
> > 
> > Most of them where triggering with core-scheduling enabled, and I don't
> > recall any of them which looked similar or related to this.
> > 
> > Still, it's possible that the same issue causes different symptoms, and
> > hence that maybe one of the patches would fix this too.
> 
> I've tested on master (d094e95fb7c), and reproduced exactly the same crash
> (pasted below for the completeness). 
> But there is more: additionally, in most (all?) cases after resume I've got
> soft lockup in Linux dom0 in smp_call_function_single() - see below. It
> didn't happened before and the only change was Xen 4.13 -> master.
> 
> Xen crash:
> 
> (XEN) Assertion 'c2rqd(sched_unit_master(unit)) == svc->rqd' failed at 
> credit2.c:2133

Juergen, any idea about this one? This is also happening on the current
stable-4.14 (28855ebcdbfa).

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

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