Re: [Xen-devel] PV-shim 4.13 assertion failures during vcpu_wake()

[Jürgen Groß <jgross@xxxxxxxx>]

On 21.10.19 11:51, Sergey Dyasli wrote:
> Hello,
>
> While testing pv-shim from a snapshot of staging 4.13 branch (with core-
> scheduling patches applied), some sort of scheduling issues were uncovered
> which usually leads to a guest lockup (sometimes with soft lockup messages
> from Linux kernel).
>
> This happens more frequently on SandyBridge CPUs. After enabling
> CONFIG_DEBUG in pv-shim, the following assertions failed:
>
> Null scheduler:
>
>      Assertion 'lock == get_sched_res(i->res->master_cpu)->schedule_lock' 
> failed at ...are/xen-dir/xen-root/xen/include/xen/sched-if.h:278
>      (full crash log: https://paste.debian.net/1108861/ )
>
> Credit1 scheduler:
>
>      Assertion 'cpumask_cycle(cpu, unit->cpu_hard_affinity) == cpu' failed at 
> sched_credit.c:383
>      (full crash log: https://paste.debian.net/1108862/ )
>
> I'm currently investigation those, but would appreciate any help or
> suggestions.
Hmm, I think that pv_shim_cpu_up() shouldn't do the vcpu_wake(), but the
caller.

Does the attached patch help?


Juergen

Attachment: 0001-xen-shim-fix-pv-shim-cpu-up-down.patch
Description: Text Data

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