Computer freezing how to troubleshoot?

My laptop running arch linux 64 bits is freezing randomly to the point that it becomes completely unresponsive.  No keyboard input works the only way is to turn it off from the power button.  I am using Gnome desktop and I switched temporarily to XFCE and the same problem occurs.
I looked at dmesg, everything.log, errors.log and I see nothing abnormal.  How can I troubleshoot it?
I upgraded today to the latest kernel 3.1.6-1 in the hope that this upgrade can solve this issue. I will also try to run memtest to see if RAM is fine.
Any tips would be appreciated.
Thanks.
Last edited by dabd (2012-01-02 00:53:58)

dabd wrote:My laptop running arch linux 64 bits is freezing randomly to the point that it becomes completely unresponsive.  .....  How can I troubleshoot it?
I had a similar lockup on two different computers running 64-bit Archlinux, but with kde 4.7.x or xmonad desktops on an Intel Sandy Bridge system with Intel HD 3000 graphics and a ION Nvidia system with nouveau graphics. I made progress by starting to watch memory use. I saw that free memory on each system kept decreasing until at times there was no free memory left. When there is no free memory Bad Things Happen.
In my case the culprit that leaked memory was Firefox 8 or 9. It could run me out of memory on my Stargate computer, which has 16 GB of ram and stays up at all times. I switched to Chromium and that has solved the problem. I still keep an eye on memory use
It might help you to keep a system monitor running, in a panel or separate window.  Start watching how much memory is in use. If you see it creeping up and up and up then you can start the process of narrowing the problem down to some specific software. It took me days of watching the memory graph to realize my problem was caused by firefox: I ran each of several DE for 24-hour periods and realized that the problem occurred under each DE. Then I let just one or two applications sit at idle for up to a day, watching memory. I could see that firefox was the problem and then let just firefox sit at idle with ALL extensions turned off. The longer firefox sat there doing nothing the more memory was used, up and up and up.  I hope you have a similar success, I know that lockups aren't supposed to happen (!) and it's very wrong and frustrating. It is probably not the fault of Archlinux ... there are a lot of upstream bugs eating away at us.

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