Demetra frezes with 100% processor utilization on ant task execution

I suspects it happens when ant task produces lots of error messages but can
not tell for sure because I see nothing - Idea just freezes almost instantly
Here is a suspected thread:

Name: AWT-EventQueue-1
State: RUNNABLE
Total blocked: 13,789 Total waited: 520,335

Stack trace:
java.util.regex.Pattern$BmpCharProperty.match(Pattern.java:3335)
java.util.regex.Pattern$Curly.match0(Pattern.java:3654)
java.util.regex.Pattern$Curly.match(Pattern.java:3628)
java.util.regex.Pattern$GroupTail.match(Pattern.java:4111)
java.util.regex.Pattern$Curly.match0(Pattern.java:3666)
java.util.regex.Pattern$Curly.match(Pattern.java:3628)
java.util.regex.Pattern$Branch.match(Pattern.java:3996)
java.util.regex.Pattern$GroupHead.match(Pattern.java:4052)
java.util.regex.Pattern$Start.match(Pattern.java:3024)
java.util.regex.Matcher.search(Matcher.java:1105)
java.util.regex.Matcher.find(Matcher.java:535)
com.intellij.execution.filters.RegexpFilter.applyFilter(RegexpFilter.java:141)
com.intellij.execution.filters.CompositeFilter.applyFilter(CompositeFilter.java:26)
com.intellij.execution.impl.ConsoleViewImpl.b(ConsoleViewImpl.java:88)
com.intellij.execution.impl.ConsoleViewImpl.c(ConsoleViewImpl.java:103)
com.intellij.execution.impl.ConsoleViewImpl.access$200(ConsoleViewImpl.java:45)
com.intellij.execution.impl.ConsoleViewImpl$1.run(ConsoleViewImpl.java:2)
com.intellij.util.Alarm$1.run(Alarm.java:106)
com.intellij.util.Alarm$MyThread$1.run(Alarm.java:250)
com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:10)
- locked java.lang.Object@20e377c2
java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
com.intellij.ide.IdeEventQueue.b(IdeEventQueue.java:64)
com.intellij.ide.IdeEventQueue.a(IdeEventQueue.java:178)
com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:83)
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
java.awt.EventDispatchThread.run(EventDispatchThread.java:121)


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