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Technical Notes
This message doesn’t come from the kernel, but from the OpenBoot PROM monitor,
a piece of Forth software that gives you the ok prompt before you boot UNIX. If the
CPU detects a trap when traps are disabled (an unrecoverable error), it signals a
watchdog. The OpenBoot PROM monitor detects the watchdog, issues this message,
and brings down the system.
Who are you?
Cause
Many networking programs can print this message, including from(1B), lpr(1B),
lprm(1B), mailx(1), rdist(1), sendmail(1M), talk(1), and rsh(1). The
command prints this message when it cannot locate a password file entry for the
current user. This might occur if a user logged in just before the superuser deleted
that user’s password entry, or if the network naming service fails for a user who has
no entry in the local password file.
Action
If a user’s password file entry was accidentally deleted, restore it from backups or
from another password file. If a user’s login name or user ID was changed, ask that
user to logout and login again. If the network naming service failed, check the NIS
server(s) and repair or reboot as necessary.
Technical Notes
There is a known problem (bug 1138025) with starting hundreds of rsh(1) processes
on another machine. This message appears because rsh(1) hangs while binding to a
reserved port, and responds too slowly to interact with the network naming service.
Window Underflow
Cause
This message often occurs at boot time, sometimes along with a "Watchdog Reset"
error. It comes from the OpenBoot PROM monitor, which was passed a processor
trap from the hardware. This error indicates that some program tried to access a
SPARC register window that wasn’t accessible from the processor.
Alphabetical Message Listing 205