[LITMUS^RT] domU crashes (RT-Xen)

[Thijs Raets]

No usable information: meaning I do have information but nothing out of the
ordinary. I'm running GSN-EDF. I also looked at /var/log/kernel.log but
nothing special. I'm new to kernel debugging so I'm having a hard time
finding the right information. But firstly I would like to know if it is
normal for Litmus-RT to crash the system when overloaded with RT tasks?

If I only run the first 7 tasks on 6 VCPUs there's no crash, also if I run
all the tasks on all of my 15 VCPUs there's no crash.

2014-04-28 15:02 GMT+02:00 Björn Brandenburg <bbb at mpi-sws.org>:

> On 28 Apr 2014, at 14:56, Thijs Raets <thijsraets at gmail.com> wrote:
> >
> > I'm running a virtual machine with 6 VCPU's with the following task set:
> > ./rtspin 12 601 120 -w &
> > ./rtspin 478 634 120 -w &
> > ./rtspin 334 636 120 -w &
> > ./rtspin 128 644 120 -w &
> > ./rtspin 460 645 120 -w &
> > ./rtspin 10 662 120 -w &
> > ./rtspin 103 666 120 -w &
> > ./rtspin 276 678 120 -w &
> > ./rtspin 137 691 120 -w &
> >
> > When I release this task set, my system crashes. I calculated the MPR
> interface and 6 VCPUs should be enough. Also /dev/litmus/log does not give
> me any usable information. I would like to test my virtual machine for real
> time behavior, so it's ok if deadlines are missed, a crash however is
> unacceptable. Can anyone help (how can I avoid this behavior or what could
> be the problem)?
>
> We're happy to help debugging crashes, but you'll need to provide more
> information. Which scheduler plugin are you using? What do you mean by
> "crash"? Are you getting a kernel panic? An OOPS? Is a BUG_ON() triggering?
> Do you have a backtrace? Is it a lock-up?
>
> Also, what do you mean by "usable information"? Are you getting any info
> at all?
>
> - Björn
>
>
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