I am seeing freezes on a 9.04 system.   It's updated on a daily basis, and
freezes have been occurring for a while.   I initially went to 9.04 a day or
two after the Beta version came out and I did not see any freezes at
first.     Some time later (before the final release), I started seeing freezes.

There is nothing in /var/log/syslog related to the freeze.   The last entry
is often several minutes before (and uninteresting).   Then, log entries
from the boot sequence appear.

Unlike fixture, I *cannot* ssh into the machine when it is frozen.

The machine is an old, generic P4 machine, 2.6 GHz.   Memtest86 reports
no problems, and it runs Windows XP perfectly.  (So, it's probably not
a hardware fault.)   Graphics is a Nvidia card.  I have ext4 filesystems
mounted, but only _readonly_.   To the best of my knowledge they are
unused, anyway.  The computer also has a mount of a remote disk
via NFS4.

I see no strong correlation with any particular program.   However, freezes
are more likely when there is a lot of activity on the desktop.   Interestingly,
though, I can run a rsync backup that creates large amounts of network,
disk, and CPU activity for 20 min without causing a freeze.     (So, freezes
do not seem strongly correlated with CPU, disk, and network activity.)

FYI, I have an identically (well, as near as I can manage) configured
4-processor AMD phenom box, and it doesn't freeze.

-- 
linux freezes completely since 2.6.28-7
https://bugs.launchpad.net/bugs/338645
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