sh (pid 1081) segfaults for page address 00000000 at pc 00000000

[Cathey, Jim]

Not saying it has anything to do with anything, but
we were having ash crash often in the parent side of
a fork/exec, which showed up in exactly those kinds
of scenarios.  Turned out to be a linux kernel problem
with copy-on-write pages on the particular MIPS we were
using: the Broadcom Raven switch chip.  But that's why
a complete environment brain-dump is helpful.

-- Jim