Again, as you said, the common denominator seems to be the nforce4 chipset+sata_nv+libata.
Have you tried it without using LVM? (I have, and the problem still seemed to occur), and strangely enough, I also tried it without dm_crypt, using truecrypt instead and it still happened.
This looks startlingly similar to the problem I've been having https:/ /bugs.launchpad .net/ubuntu/ +source/ linux-source- 2.6.22/ +bug/121273
Again, as you said, the common denominator seems to be the nforce4 chipset+ sata_nv+ libata.
Have you tried it without using LVM? (I have, and the problem still seemed to occur), and strangely enough, I also tried it without dm_crypt, using truecrypt instead and it still happened.