You can get ps easily to core dump, if you are running a "make depend"
on a kernel in one window and a "ps -auxww" in another. The ww will
try to give you the full argument list of the command that can
now be 64Kb large, but ps expected only 4Kb large arg arrays and
doesn't check for overflows.
that old `ps'es did. I'm not too thrilled about this, but I'm not
enough of an FS person to hack procfs so that /proc/xxx/mem is readable
by members of group `kmem'. If this is done, then `ps' can go back to
being set-gid kmem.