I got a Cuda-WU yesterday, that failed to make any progress on my machine. http://einsteinathome.org/task/221233015
Run time 62,431.42 CPU time 87.27 Validate state Invalid
Usually my WUs take about a tenth of this time. The GPU was cold when I aborted it.
The WU is still not successful, lot's of aborts and errors, and 2 inconclusive completes.
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Aborted hanging WU
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I've had a few do this. Usually I spot them not moving and suspend then resume them to get them going. If you don't spot them they eventually exceed their time limit and get aborted by BOINC. It doesn't happen too often, but can be annoying when they do this for no apparent reason.
BOINC blog