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[Stuart <stuartneilson@xxxxxxxxxx>]

Igor Wojnicki  wrote "Take a lookat StuartN's post: http://ubuntuforums.org/showpost.php?p=9468596&postcount=487
This might be a hint what causes the freezes."

Switching the root filesystem to writeback mode (instead of the default
ordered mode) will work with EXT3 or EXT4. It is not a solution, but it
is possibly a method of gathering further data. In my case, I have a
system that is functioning (almost) perfectly with kernel 2.6.34 and
freezing with kernel 2.6.32-22. The freeze now affects a single process,
all the inodes attached to that process and subsequently all processes
depending on those inodes - yes, the system does fully freeze after some
time, but I have no difficulty accessing logs after recognizing that a
process has frozen. (See
http://www.iol.ie/~stuartneilson/Bootup_fsck.html)

Following the first message, "EXT4-fs warning (device sda4): dx_probe:
dx entry: limit != root limit" (which would equally apply to EXT3-fs),
leads to a commit 3d82abae9523c33d4a16fdfdfd2bdde316d7b56a with the
title "dir_index: error out instead of BUG on corrupt dx dirs" -
http://mirror.celinuxforum.org/gitstat//commit-
detail.php?commit=3d82abae9523c33d4a16fdfdfd2bdde316d7b56a -
http://lkml.indiana.edu/hypermail/linux/kernel/0709.3/0208.html

I have not located the version where this is merged into the Ubuntu
kernel, or indeed if it is directly relevant. I am going to test
Paul.Drover's suggested test for affected systems from
http://ubuntuforums.org/showpost.php?p=9471373&postcount=496

-- 
Ubuntu 10.04 random freezes
https://bugs.launchpad.net/bugs/585765
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