Re: kernel error

Martin Radford (M.P.Radford@exeter.ac.uk)
Thu, 31 Oct 1996 11:11:45 +0000 (GMT)

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In reply to: Castelijn, Maurice: "RE: kernel error"

>
>"Cannot change to /var/spool/at/: Permission denied" <-- CRAP. it's on
>-rwx------, should be ok.

I get these too. I ended up disabling the at command (it runs from
cron, so edit /etc/crontab) - quick and dirty, but I'd still like to
know what causes this.

>
>things like when I try to mail (not even compile!):
>
>mail(246): unaligned trap at fffffc0000342028
>mail(246): unaligned trap at <same address>
>and that for about 4 times... at least.
>
>Is this something that has got to do with hardware conflicts/problems?
>Or is this 'normal'?

No this is "normal". The Alpha architecture needs to store things on
different boundaries, so a 32-bit value needs to be stored on a
4-byte boundary, etc. The processor traps if you try to break this
rule. The kernel catches the trap, gives the error message you see,
and then emulates the instruction in such a way as to keep the
hardware happy. Trouble is that this is slow.

>I've never had this in other versions of Linux before (Slackware) ...
>so, don't know what this is.

It's alpha-specific (or at least the problem doesn't exist on the ix86
processor line).

Martin

-- Martin Radford: M.P.Radford@exeter.ac.uk

Student of Computer Science at the University of Exeter, UK.

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