um: rcu_sched_state detected stall on CPU 0

um: rcu_sched_state detected stall on CPU 0

[richard -rw- weinberger]

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Hi,

I'm seeing often messages like this one on my UML:
...
INFO: rcu_sched_state detected stall on CPU 0 (t=7348 jiffies)
...

The system often seems to be frozen.
When I press a button it wakes up immediately and continues to run.

Any ideas?
Config is attached.

-- 
Cheers,
//richard

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Re: [uml-devel] um: rcu_sched_state detected stall on CPU 0

[Chris Frey]

On Sat, Oct 02, 2010 at 12:03:04AM +0200, richard -rw- weinberger wrote:
> Hi,
> 
> I'm seeing often messages like this one on my UML:
> ...
> INFO: rcu_sched_state detected stall on CPU 0 (t=7348 jiffies)
> ...
> 
> The system often seems to be frozen.
> When I press a button it wakes up immediately and continues to run.
> 
> Any ideas?
> Config is attached.

I saw this too, but I thought it was because I was overloading my machine.
I only seem to see it when the guest is starved for CPU due to IO on the
host.

- Chris


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