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Re: [Xen-devel] Core Scheduling "lock == schedule_lock" assertion failure
- To: Jürgen Groß <jgross@xxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>
- From: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
- Date: Thu, 13 Feb 2020 14:19:13 +0000
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- Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, "sergey.dyasli@xxxxxxxxxx >> Sergey Dyasli" <sergey.dyasli@xxxxxxxxxx>, Dario Faggioli <dfaggioli@xxxxxxxx>
- Delivery-date: Thu, 13 Feb 2020 14:19:18 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 12/02/2020 12:24, Jürgen Groß wrote:
> On 12.02.20 12:21, Sergey Dyasli wrote:
>> Hi Juergen,
>>
>> Recently our testing has found a host crash which is reproducible.
>> Do you have any idea what might be going on here?
>
> Oh, nice catch!
>
> The problem is that get_cpu_idle_time() is calling vcpu_runstate_get()
> for an idle vcpu. This is fragile as idle vcpus are sometimes assigned
> temporarily to normal scheduling units, thus the ASSERT() in the unlock
> function is failing when the assignment of the idle vcpu is modified
> under the feet of vcpu_runstate_get() and the unit it has been assigned
> to before is already scheduled on another cpu.
>
> The patch is rather easy, though. Can you try it, please?
Thank you for the patch! I put it into testing yesterday and it looks
good so far. It also seems that the issue is well understood and the
patch should go into the main tree.
--
Sergey
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