repeatable kernel freeze

[Joe Conway]

I have had a problem with kernel freezes for several months. It started
when I first moved to the 2.6.31 kernel on Fedora 12. At that time it
was relatively infrequent. When the 2.6.32 kernel came out, the problem
became very bad -- every night when cron.daily runs the kernel would
hang. Note that I have tried in these instances to ping or ssh from
another box -- this box is definitely hung. So I kept the 2.6.31 kernel
around and only had to deal with it once every two weeks or so. It is my
personal machine, so it was tolerable.

Upon upgrade to Fedora 13 and the 2.6.33 kernel, the problem has become
better in that I have not seen a hang during the nightly crons. However,
now I can freeze the kernel on demand by copying a large file via ssh
(scp or rsync). Perhaps relevant is that those cron nightly jobs include
several rsyncs, however they are all local and do not use ssh.

I have already made a bugzilla report, but have not heard a word on that.

Given that I can now reproduce the problem more-or-less on demand, can
someone tell me how to debug this? I have no experience with kernel
debugging, but am reasonably good with gdb on user-space apps.

Thanks,

Joe

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