Re: [Xen-devel] [PATCH v1 0/2] xen/arm: maintenance_interrupt SMP fix

[Oleksandr Tyshchenko <oleksandr.tyshchenko@xxxxxxxxxxxxxxx>]

There is no specific reason) But, as I found out we already have our
local tree based on 4.4.0-rc1.
All works on porting our local patches on top on 4.4.0-rc1 (resolving
conflicts, etc.) were done by my colleagues.
I saw that the range of commits that you pointed are present there.
And I just moved.

I mean that hypervivor stucks somewhere in the interrupt (gets into an
infinite loop trying to acquire lock, or waiting for event). And as
result nothing works. Of course we don't have any output from it
(Console is not working)
For example, as it happened in on_selected_cpus()

I run domU. We have operation system in domU with UI. After moving to
4.4.0-rc1, hypervivor began to hangs very often. I have not identified
yet where this is happening. And these hangs occur when I use
touchscreen (domU is running at this time). It is somehow depends on
touchscreen irq. I would even say, from "touchscreen interrupt rate".
I was trying to change interrupt priority and was doing other things,
but, I don't have any positive results.
At first I need to localize where deadlock happens.

On Thu, Jan 30, 2014 at 11:47 PM, Julien Grall <julien.grall@xxxxxxxxxx> wrote:
> Hello,
>
>
> On 30/01/14 19:54, Oleksandr Tyshchenko wrote:
>>
>> I moved to 4.4.0-rc1 which already has necessary irq patches.
>
>
> Any specific reason to use 4.4.0-rc1 instead of 4.4.0-rc2? There is a bunch
> of fixes (which should not be related to your current bug) such as TLB
> issue, foreign mapping, and a first attempt to fix guest cache issue.
>
>
>> And applied only one patch "cpumask_of(0) in gic_route_irq_to_guest".
>> I see that Hypervisor hangs very often. Unfortunately, now I don't
>> have debugger to localize part of code.
>> So, I have to use prints and it may takes some time(
>
>
> What do you mean by hang? Do you have any output from Xen? What do you run?
> Dom0 and a DomU?
>
> Sincerely yours,
>
> --
> Julien Grall



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