I upgraded kernel to 2.6.31-15 version (available in karmic
repositories) and the problem seems to be fixed.
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BUG: Bad page map in process cc1 pte:df8400c0 pmd:18eb7067
https://bugs.launchpad.net/bugs/364534
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I had similar problem today, but I have installed kubuntu-desktop on my ubuntu,
and I were using kwin when the bug happened.
kwin suddenly started crashing, and restarting kdm didn't change anything. when
I restarted the computer and logged in my gnome desktop, I got the above
massages.
I use