I'm running kernel 18.104.22.168-10.fc8 i686 on both my desktop and portable. my setup was a mix of both the guide at "the perfect fc8 desktop" and "the unofficial fedora faq" to help me get java, flash and a few other things working correctly. my issue is that on only my desktop, if it sits idle, slowly the memory cache is filled to 100%, at which time the system locks up. it happens faster if I try to run the yumex updater, or if I leave open a website with flash embedded. It usually takes about 3 days to completely fill, but if I have both yumex updater and flash going at the same time, it will lock up in less than 5 minutes.
As the cache goes "free" reports the size of the 'cached' rising, and 'system monitor' reports the same.System monitor and "top" don't report any programs specifically taking any larger than normal pieces of memory. My swap partition never seems to be touched. my fstab file has my swap file listed correctly and auto mounted (it's also listed in "free" but always as 0 used). This issue does not occur if I run a live version of FC8, on a previous install I had of openSUSE 11.3, or if I boot to puppy Linux. I have also tried updating my kernel version, to no avail.
I'd appreciate any assistance I could get on this.