All our executors dies with the following stacktrace. We have a slave named "lucene.zones.apache.org (Solaris 10)", unknown if any job has assigned this as a label.

java.lang.IllegalArgumentException: Invalid label expression: lucene.zones.apache.org (Solaris 10)
at hudson.model.Hudson.getLabel(Hudson.java:1381)
at hudson.model.AbstractProject.getAssignedLabel(AbstractProject.java:288)
at hudson.model.Node.canTake(Node.java:242)
at hudson.model.Queue$JobOffer.canTake(Queue.java:190)
at hudson.model.Queue$ApplicableJobOfferList.(Queue.java:818)
at hudson.model.Queue$ApplicableJobOfferList.(Queue.java:810)
at hudson.model.Queue.pop(Queue.java:740)
at hudson.model.Executor.grabJob(Executor.java:165)
at hudson.model.Executor.run(Executor.java:106)
Caused by: line 1:25: unexpected token: (
at hudson.model.label.LabelExpressionParser.term4(LabelExpressionParser.java:170)
at hudson.model.label.LabelExpressionParser.term3(LabelExpressionParser.java:119)
at hudson.model.label.LabelExpressionParser.term2(LabelExpressionParser.java:89)
at hudson.model.label.LabelExpressionParser.term1(LabelExpressionParser.java:60)
at hudson.model.label.LabelExpressionParser.expr(LabelExpressionParser.java:50)
at hudson.model.Label.parseExpression(Label.java:458)
at hudson.model.Hudson.getLabel(Hudson.java:1379)
... 8 more