Ok, following up on this, I dropped in a new video card this weekend (generic Radeon 7000), and my system crashes have gone away. So the video card was indeed the culprit, must have been locking the PCI bus or something. Now I can leave mplayer looping overnight or run folding@home without any problems. However... With the latest rawhide kernels, I still can't run azureus for very long. Not a crash, but the OOM killer seems to take it (and other things) out abnormally early. The thing is, it happens in situations where, near as I can tell, I'm not that low on memory. I do have only 256 MB RAM, and the kernel slab debug is using a lot of memory as I documented in an earlier post to fedora-devel-list, but it seems like the swap (and I've got 512 MB of it) has hardly been touched when this happens. I am running with vm.swappiness=0, but that's supposed to just keep it from swapping until it *has* to, not stop swapping altogether (and it isn't). Actually, I just had the OOM killer take out firefox while I was bugzilla'ing something else :( Here's what it has to say for itself. This is under kernel-2.6.10-1.1141_FC4(.i686): http://kuoi.asui.uidaho.edu/~wes/oom-sucks.txt Anyone here that can tell if that was premature? Or should I post that to the fedora-devel-list? --wes