While attempting to reproduce a different error, I stumbled upon this one. Using test_pcap_500m, I set alignment="implicit" instead of alignment="8" in the schema that it uses:

daffodil-perf/src/test/resources/edu/illinois/ncsa/daffodil/pcap/profilingPCAP.dfdl.xsd

[info] - test_pcap_500m *** FAILED ***
[info] java.lang.OutOfMemoryError: GC overhead limit exceeded
[info] at scala.LowPriorityImplicits.intWrapper(LowPriorityImplicits.scala:32)
[info] at scala.collection.mutable.ResizableArray$class.copyToArray(ResizableArray.scala:75)
[info] at scala.collection.mutable.ArrayBuffer.copyToArray(ArrayBuffer.scala:47)
[info] at scala.collection.TraversableOnce$class.copyToArray(TraversableOnce.scala:226)
[info] at scala.collection.mutable.ArrayBuffer.copyToArray(ArrayBuffer.scala:47)
[info] at scala.collection.TraversableOnce$class.toArray(TraversableOnce.scala:234)
[info] at scala.collection.mutable.ArrayBuffer.toArray(ArrayBuffer.scala:47)
[info] at scala.collection.immutable.StringLike$class.format(StringLike.scala:270)
[info] at scala.collection.immutable.StringOps.format(StringOps.scala:31)
[info] at scala.runtime.StringAdd.formatted(StringAdd.scala:22)

The 500MB PCAP file is located on a server at Tresys in an SVN repo: svn co svn+ssh://username@repos/repos/svn/ngf-dfdl/Input/pcap/