To: maximum entropy <firstname.lastname@example.org>
From: Jonathan Stone <jonathan@DSG.Stanford.EDU>
Date: 11/06/1997 18:28:18
maximum entropy writes:
>>From: Simon Burge <email@example.com>
[troubles with Mona]
>Make sure the kernel and *all* of userland on mona (especially /bin
>and /sbin which are not on the shared /usr filesystem) are up to date.
>Reboot mona and all should be well.
>This isn't really a kernel problem, it's caused by out-of-date
>userland binaries but up-to-date shared libs.
The glass is half full, or the glass is half empty. It's still the same glass.
The problem is that the accidentally-updated /usr makes syscalls which
are not implemented by the 1.2G kernel. Which you call out-of-date
and which up-to-date is semantics. Simon didn't realize a `make build'
on one machine would also clobber the NFS-mounted /usr on the second
The simplest way to rescue Mona is to netboot a kernel that *does*
have the new xxx13 syscalls (from the good machine) on Mona. Then
mount Mona's local root as root. The updated /usr will then work,
because the net-booted-mounted kernel has the 1.3 syscalls. Then
proceed to do an upgrade on the affected machine.
(I'm saying this only in case the same thing happens to someone else.)