I want to apologize for my last comment.  I really like having a free
operating system and all the free software, and I love the people who
volunteer their time putting it all together and making it work as well
as it does (thank you!).  I was in a bit of a mood after messing with
this thing all night.

I use Ubuntu because I am lazy.  I don't go out of my way to install the
newest cutting edge stuff because I would rather not be the one who
spends his hours sifting through these forums / the source / git bisect
/ etc.  I'd rather benefit from the hard work of the people who like to
do that stuff (thanks again!)  So once every year or so, whenever I get
a new drive or update some hardware in some significant way, I go to the
Ubuntu website and download the latest installation image, and usually
only after it's been out a few months.  With minimal faffing I have my
system up and running in half an hour or so, all my old data happily
copying over to the new system.  I never read release notes, things just
work (well, laptops usually need a little tweaking).

I had no idea this last time that when I installed 9.04 that selecting
ext4 was in any way dangerous or experimental.  Deviating away from the
"stable defaults that Ubuntu provides" was as easy as cursoring up (or
down, I don't remember) from ext3 to ext4.  I saw the option, thought to
myself, "cool, it's here, this is Ubuntu, it must be working well" why
not use ext4 vs. ext3?  I had no idea that I was doing something even
slightly risky, because there was nothing in the lazy man's path from
download to having a running system that would have told me so.  If
there was, I would have gone ext3 and I never would have read this
thread and you wouldn't be wasting your time reading this right now.
>From now on, I'll read the release notes and hopefully save us all some
time.  I'd like to be more lazy, but there simply isn't a better option
than Ubuntu right now.

So lazy talk aside, I'd actually like to be more helpful when these
things come up.  This particular case looks (from the tiny bit I have
seen) like a classic deadlock. In the codebase I am most familiar with,
it's pretty simple to turn on traces for locks that you know are in
contention and use the trace to find the culprit.  It's been almost ten
years since I've done any significant work in the Linux kernel, however,
so I'd have to do some ramping up.  Anyone have pointers to your
favorite kernel hacking resources (I'm sure even the basic tools have
changed a lot in 10 years) in case I find myself motivated and with some
time on my hands?

Thanks,
Jason

-- 
Soft lockups (freezes) when deleting files from ext4 partitions on 2.6.28
https://bugs.launchpad.net/bugs/330824
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