OK, so here goes. I've been futzing around with my wireless NIC recently, and looks to me like the rt61(pci) module might have something to do with the hang (I'm just guesstimating but the presence of the driver seems to correlate with the hangs).
The lsmod is taken some fifteen minutes prior to the hangup -- it's hard to cause reliably, very intermittent but seems to happen most often when apt or update-manager are doing something. ** Attachment added: "lsmod a few minutes prior to the hang" http://librarian.launchpad.net/6702485/lsmod.txt -- BUG: soft lockup detected on CPU#0! https://launchpad.net/bugs/83009 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs