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

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

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.
>
>
> (XEN) Xen BUG at sched_credit2.c:3474
> (XEN) ----[ Xen-4.13.0  x86_64  debug=n   Not tainted ]----

Any chance you can reproduce with a debug build?

There is a good chance that an assertion might fire earlier than this BUG().

~Andrew


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