Same problem here. Thinkpad X61. Computer freezes during high disk
activity. Though, it's probably not EXT4, because I had the same problem
with a EXT3/Reiserfs setup. In fact, I did a clean ext4 install to test
out my original theory of this being a reiserfs problem. Sometimes
triggering a freeze only requires saving a document on OpenOffice,
Firefox is not required for freeze.

Sometimes you can recover from the freeze by waiting a bit and gently
tap the power button, which can bring up the Gnome shutdown panel. Even
after recovery, computer quickly becomes unusable and loaded with some
kind of processing. If you check powertop, you would find the processor
mysteriously at C0 80 or 90% of the time with no program attributable to
the activity.

No weird messages or oops in kernel log.

Compiled 2.26.29.1, same problem.

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Kernel freezing on both ext3 and ext4, possible criminal is Firefox
https://bugs.launchpad.net/bugs/327509
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