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Re: [Xen-devel] [PATCH v2 0/2] xen/arm: vcpu_yield on WFE

On 07/23/2014 05:21 PM, Stefano Stabellini wrote:
> On Wed, 23 Jul 2014, Julien Grall wrote:
>> On 07/23/2014 02:35 PM, Stefano Stabellini wrote:
>>> Hi all,
>> Hi Stefano,
>>> the patches should be self-explanatory.
>> I gave a try of this series on midway and hackbench get stuck after few
>> minutes.
> Just as a confirmation, you did run hackbench before on midway and it
> didn't get stuck, right?

Yes. The latest working version is c047211.

I got 2 different kind of errors with a guest setup with 2 VCPUs:
        1) Hackbench gets stuck and use 100% of the CPU.
        2) Hackbench heap gets corrupted

For the former, I was thinking about a possible missing SGI.

>> FYI, I'm not able to reproduce on our local midway node.
> Without a reproducing environment is going to be very hard to fix it.
> It might be worth living it running in a loop for a few hours...

Sorry I meant I'm able. I spent my afternoon to set up the same
environment as the CI loop.

It looks like the bug is likely the same on the Arndale, even if WFE is
not trap. I will try to bisect on this board.


Julien Grall

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