inserting USB key causes reboot (sometimes)

[Rob Owens <rowens@ptd.net>]

I need help diagnosing a problem.  I have a Lenny system that sometimes
reboots when I insert a USB key.  It happens with multiple USB keys, but
I can't figure out the pattern as to when it reboots and when it
doesn't.

I should mention that it's more of a hard reset than a reboot --
services don't get a chance to shut down or anything like that.

I *think* it is more likely to happen if I insert the USB stick
immediately after login.  GDM is set up to auto-login my user.

I've looked through the log files but can't find anything conclusive.
Anybody have any ideas?

-Rob