Precaution!

If you booted a kernel from approximately April 15th through May 3th,
there were a number of small, but critical, vm bugs.  This can cause
file system corruption, and leave silent landmines for later.  It is
recommended that if you did boot these kernels, you build a newer
kernel, come up in single user and force an fsck on all filesystems.
This is to prevent 'false' panics later that are a result of the
corruption that might be dormant in them now.

Warner