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[George Schneeloch <1000946@xxxxxxxxxxxxxxxxxx>]

** Attachment added: "crash log"
   https://bugs.launchpad.net/bugs/1000946/+attachment/3151026/+files/hs_err_pid22976.log

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https://bugs.launchpad.net/bugs/1000946

Title:
  SIGSEGV happens when using Transform3D with certain parameters

Status in “openjdk-6” package in Ubuntu:
  New

Bug description:
  I was experimenting with ReplicatorG (Java open source 3D printer
  software) and I managed to cause a seg fault. I'm having trouble
  narrowing down what the problem is but I think it's related to Java3D.
  That's the area I've been playing around in, so it would make sense.
  The crash happens on BuildSimulation, around line 230:

  		transform.lookAt(new Point3d(0, 0, 0), new Point3d(diffX, diffY, diffZ),
  				new Vector3d(0, 1, 0));
  		System.out.println("After: transform: " + transform + ", drop: " + drop);
  		transform.mul(drop);
  		System.out.println("After2: transform: " + transform);

  The crash appears to happen when transform.mul(drop) is called, since
  the text after that statement is not printed out. If I change the last
  parameter in transform.lookAt to new Vector3d(0, 0, 1), the crash
  doesn't happen anymore. The crash reliably happens every time I run
  the program, although sometimes it hangs instead of crashes.

  Sorry that I couldn't separate the problem out further. I can attach a
  tarball with ReplicatorG's source and brief instructions to reproduce
  the problem, although it is 40mb. Hope this helps.

  1) lsb_release -rd is Ubuntu 12.04 LTS
  2) apt-cache policy openjdk-6-jdk

  openjdk-6-jdk:
    Installed: 6b24-1.11.1-4ubuntu2
    Candidate: 6b24-1.11.1-4ubuntu2
    Version table:
   *** 6b24-1.11.1-4ubuntu2 0
          500 http://us.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
          100 /var/lib/dpkg/status

  3) It should continue without crashing, or at least throw an exception
  4) It crashed with a seg fault message. The log is attached

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