[Motmot] Segmentation faults

[Andrew Straw]

John Schneider wrote:
> Hey Andrew,
> 
> The segmentation fault happens at variable times throughout
> acquisition, sometimes several hours into it. I've rebooted,
> un/replugged, and set the framebuffer to 5; it segfaulted sometime
> last night.
> As for why the camera would be closed, I'm at a loss.
> Screensavers/power management have all been disabled, no other
> programs are open when fview is going.
> I seem to be able to reproduce this fairly regularly (unfortunately),
> any other troubleshooting steps?


Hi Jon,

OK, I'm able to reproduce the bug on our end using Alice's FView setup,
and I'm in the process of debugging it now. Given that it's a fairly
infrequent event that triggers it, this process may be sped up if you
can help. One of my hunches is that there's some recent update to the
Ubuntu Hardy kernel that is causing these problems, because I have done
 little that could account for this. So, if you could reboot your
computers and in the GRUB boot screen select the 2nd most recent kernel
to boot into, that would be great. Specifically, choose "2.6.24-22"
instead of "-23". (No need to choose the "recovery mode".) Then run the
cameras and see if the problem arises again.

For what it's worth, we are running with the motmot camiface drivers
(but not FView) daily for extended periods on a multi-camera tracking
setup with 5 or 9 cameras and not seeing this bug. So, I guess it's
something being triggered by FView itself, even if it's not FView
directly with the bug.

I'll keep replying to this list as the debugging process unfolds.

-Andrew

-- 
Andrew D. Straw, Ph.D.
California Institute of Technology
http://www.its.caltech.edu/~astraw/