I just wanted to add a "me, too." We've now seen this on three different machines (two different hardware setups). It seems to occur during graphically-intensive operations. In our case, it has occured both during Matlab figure generation and Tecplot drawing. One machine has an Intel 945G, and the other two have an nVidia NV18, so it doesn't appear to be related to the graphics card or drivers. I've enabled core dumps on my machines, so when and if it happens again, I may be able to upload a core file. In the meantime, I'll attach a couple of the X backtraces, just for some more examples.
** Attachment added: "X Segfault on nVidia/Matlab" http://librarian.launchpad.net/6438382/x-segfault-nvidia-matlab -- X appears to crash randomly https://launchpad.net/bugs/71913 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
