I had the same problem.
Am running a 64-bit sempron 2800 (1600MHz) overclocked to 350x8 (2800MHz) with the RAM on a divider at 280 MHz. The system had memtested stably with no errors for hours. Load temps seemed to be in the region of 46 Degrees Centigrade. My board is an EPoX 8KDA3+.
Naturally, when I got kernel panic, i thought it was due to my rather daring overclock
(I downloaded stresslinux to see how stable this overclock was), so I backed it off back down to 200x8 at default core and chipset voltage, (BIOS now reported 22 degrees idle temp) but still got the same error.
I was using stresslinux 0.3.1rc4 from the downloads page.
Will try the new ISO tomorrow, hopefully. Thanks!
Keep up the great work guys, let me know if I can help out in any way (testing etc.)
Regards
karbonKid