possible bug with 2.7.8 shut down of linuxcnc

I'm in the process of wiring/configuring my 7i77 and experienced a shut down of linuxcnc. See the attached screen notification.
I did a memory test for over an hour and all checked out okay. I was able to replicate the shut down 3 times when using the up/down keyboard keys to rapidly change direction then hitting home and end key. I think it was the end key that triggered the black screen and or a combination of page down and end. I noticed this when testing the Z axis.
Can anyone else replicate this??

Tommylight thanks for the response. I will check my hardware. I have no issues running code or jogging my axis except for when I hit the end key by accident while cycling through the z up/down key. If it's hardware I would expect it to be random, no?

I ran the memory test for over 1.5 hrs and the report was fine. If it's the memory controller or the memory would that not show during testing? I'll re-run that again for longer if it's at all a reliable indicator. I'll check temp too but I can tell you that ambient shop temp is low here this time of the year and I was able to trigger the error within the first few minutes of powering on.
Would installing an older version of linuxcnc rule out a bug and verify that it's a hardware issue?
Could someone in the mean time try the same key strokes on their machine to see if they get a computer crash?

Is it always the same error and same place? (in emcmotCommandHandler)
if so that does suggest software a bit more than hardware.

A simple brute force hardware test would be to use another PC just for a quick verification
(just swap hard drive and FPGA card)

Ohh, a Dell 755, I think it might have the i810 chipset, or descendant. I had occasional problems with a graphics crash on an Optiplex GX260 with the i810. It never happened with the Ubuntu 8.04 LinuxCNC, happened occasionally with the Ubuntu 10.04 LinuxCNC, but became a HUGE problem with the Debian LinuxCNC. Several people recommended hacks to the X11 config files, but they didn't fix it. In all these cases, the kernel would stay up, but the graphics would go haywire and X would shut down. (That doesn't exactly match your result, you seem to have a kernel panic.)

Anyway, the fix I finally had to go with was to get an Nvidia graphics card and disable the on-board graphics. Have not had any problems with the system since. There is quite a bit of documented problems with the Intel graphics chips with later kernels, if you look around. This not only applies to the i810, but several later integrated graphics chips.

Jon

Bummer, that computer came up as a good candidate and I looked for it. I didn't realize it was not suitable for Debian.
I don't have another PC to test at the moment unfortunately.

Well, I got the Nvidia card for less than $15 on eBay. And, of course, I'm really GUESSING at YOUR problem, it could be something totally different. If you have any old graphics cards lying around, you could try one out and see if the problem goes away. In my case, my GX260 was slim form factor, so I jammed a full-height card I had here, left the care open and observed that fixed the problem. So, I had a lot of confidence that I could fix it. Then, I just had to search for a half-height graphics card and I was in business.

Jon