On 12/23/2011 09:25 PM, Lennart Sorensen wrote:
On Fri, Dec 23, 2011 at 09:08:11PM +0100, Philippe Gerum wrote:
Do you have a typical test scenario which triggers this bug?

It can take a couple of hours under pretty heavy load to get one
occourance.  But with preemptible context swiches off we haven't seen
any in a week.

For sure xenomai tasks are handling interrupts quite a lot at the time.

I wish we had a simple test case to show it, but it seems to require
triggering an interrupt in the middle of a context switch at exactly
the wrong place.

Is it reproducible with the basic latency or cyclic tests if waiting for long enough? Running ltp in parallel would trigger a decent load, but sometimes two shell loops forking commands in the background are enough to trigger a variety of issues when something fragile exists in the mmu layer as modified by the I-Pipe.


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