Still a mystery then? I know I'm not the only person to get this but I also know that some have never seen it either so it suggests it's avoidable or has a definite cause.
I'm going to submit something to support about this once I've been able to capture a screenshot. In the meantime I pulled something from web_service.log:
2012-02-22 08:11:04,901 ERROR [4f44a318c63e76ba8] module:56 - [Errno 9] Bad file descriptor
Traceback (most recent call last):
File "D:\Program Files\Splunk\Python-2.6\Lib\site-packages\splunk\appserver\mrsparkle\controllers\module.py", line 54, in renderModule
pageContent = instance.generateResults(**args)
File "D:\Program Files\Splunk\share\splunk\search_mrsparkle\modules\results\SimpleResultsTable.py", line 140, in generateResults
adjustedMin, adjustedMax = util.getPercentiles(ordered, .05, .95)
File "D:\Program Files\Splunk\Python-2.6\Lib\site-packages\splunk\appserver\mrsparkle\lib\util.py", line 542, in getPercentiles
return (v(lowerPercentile, orderedList), v(upperPercentile, orderedList))
File "D:\Program Files\Splunk\Python-2.6\Lib\site-packages\splunk\appserver\mrsparkle\lib\util.py", line 534, in v
n, k, d = f(percentile, len(oList))
File "D:\Program Files\Splunk\Python-2.6\Lib\site-packages\splunk\appserver\mrsparkle\lib\util.py", line 530, in f
print n,k,d
IOError: [Errno 9] Bad file descriptor
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