Comment 12 for bug 327509

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.