[LITMUS^RT] Hit crash in C-EDF (configured as partitioned)

[Jonathan Herman]

The race is caused by:
1. Userspace completion of task on CPU 1
2. Kernelspace requeue() of task on CPU 2
3. Kernelspace reschedule and job_completion of task on CPU 1

Shouldn't the other plugins be vulnerable to the same race condition? I
also encountered this in C-EDF (on a KVM, only with CONFIG_..._AFFINITY),
but I can see the same sequence of calls occurring under other plugins.


On Tue, Jan 29, 2013 at 9:47 AM, Björn Brandenburg <bbb at mpi-sws.org> wrote:

>
> On Jan 29, 2013, at 2:02 PM, Glenn Elliott <gelliott at cs.unc.edu> wrote:
>
> > Can you say why I was only hitting this bug in a C-EDF partitioned case?
>  Did it only make this race condition more likely?
>
> I believe that race always existed, but we only started hitting it with
> the new synchronous release code under certain configurations. I never saw
> it in KVM, for instance, and not on all physical machines.
>
> - Björn
>
>
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-- 
Jonathan Herman
Department of Computer Science at UNC Chapel Hill
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