This library contain function GotoState() in the src/glu/sgi/libtess/tess.c file. It is possible to enter an endless loop in this function due to incorrect usage of libglu functions because switch() statements in this function doesn't check for all possible values and there is no error processing under "default" labels. I've encountered this bug by using some Windows applications running under wine 1.6.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: libglu1-mesa 8.0.4-0ubuntu0.6
Uname: Linux 3.6.6-030606-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.3
Architecture: amd64
Date: Fri Aug 9 10:21:12 2013
InstallationMedia: Xubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120817.3)
MarkForUpload: True
SourcePackage: mesa
UpgradeStatus: No upgrade log present (probably fresh install)
The same hang happens on Quantal with libglu 9.0.0-0ubuntu1.