Re: [ANNOUNCE] Xen 4.15 - hard codefreeze today

[Dario Faggioli <dfaggioli@xxxxxxxx>]

On Fri, 2021-02-19 at 16:47 +0000, Ian Jackson wrote:
> 
> OPEN ISSUES AND BLOCKERS
> ------------------------
> 
> F. BUG: credit=sched2 machine hang when using DRAKVUF
> 
> Information from
>   Dario Faggioli <dfaggioli@xxxxxxxx>
> References
>   https://lists.xen.org/archives/html/xen-devel/2020-05/msg01985.html
>   
> https://lists.xenproject.org/archives/html/xen-devel/2020-10/msg01561.html
>   https://bugzilla.opensuse.org/show_bug.cgi?id=1179246
> 
> Quoting Dario:
> > Manifests only with certain combination of hardware and workload. 
> > I'm not reproducing, but there are multiple reports of it (see 
> > above). I'm investigating and trying to come up at least with 
> > debug patches that one of the reporter should be able and willing
> > to 
> > test.
> 
> Dario is working on this.  Last update 29.1.21 ?
> 
Yep. A have a few more insights about it, but still not sure about a
few things. I'll try to give a more detailed update on Mon or Tue

> G. Null scheduler and vwfi native problem
> 
> Information from
>   Dario Faggioli <dfaggioli@xxxxxxxx>
> 
> References
>    
> https://lists.xenproject.org/archives/html/xen-devel/2021-01/msg01634.html
> 
> Quoting Dario:
> > RCU issues, but manifests due to scheduler behavior (especially   
> > NULL scheduler, especially on ARM).
> > 
> > Patches that should solve the issue for ARM posted already. They
> > will need to be slightly adjusted to cover x86 as well.
> 
> As of last update from Dario 29.1.21:
> waiting for test report from submitter.
> 
Report recently arrived and was positive. The issue, on ARM, is solved
by the patches sent to him. I've done the x86 bits of those patches,
but am still debugging an error I have with them applied.

It probably make sense for me to properly submit the two patches that
fix the problem on ARM right away (the x86 part would be in its own
patch anyway).

Thanks and Regards
-- 
Dario Faggioli, Ph.D
http://about.me/dario.faggioli
Virtualization Software Engineer
SUSE Labs, SUSE https://www.suse.com/
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<<This happens because _I_ choose it to happen!>> (Raistlin Majere)

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