Lately I've started to wonder if there isn't more than one bug at work
here.  The main barrier to my getting information about this is that I
can't save any files after the problem pops up.  The logs just stop and
then start up again when I restart the machine.

Have you noticed any strange activity by any of your programs BEFORE
your hard-drive goes read-only?  Also, what other programs does top show
eating up your CPU, besides dd, klogd and ksoftirqd?

Mostly, the three procs that are always there are usually accompanied by
firefox, though at least once I saw evince instead.  Lately the pattern
is that firefox suddenly starts thrashing, hopping from one core to the
other (I have a Core 2 Duo in this machine), and then after it stops, I
get the read-only file system and the deadlock with dd/klogd/ksoftirqd
and company.

I, sadly enough, don't have any USB keys or anything like that, but it
recently occurred to me that if I had one mounted, I could save the
output of dmesg or other programs on that, and sift through it for clues
later.  I just have to be sure that the programs I need (mount, umount,
sudo, dmesg, cp, df...) have been used recently, so they'll still be
paged into memory instead of on the hard disk where you only get
input/output errors.

Let me know if you find out anything. I'd love to get to the bottom of this too.
~jdacronym

-- 
Hardy: ksoftirqd, dd, klogd use 100% CPU, Disk
https://bugs.launchpad.net/bugs/368324
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