Subject: install/28841: sysinst code dumps on invalid extended partition (mbr)
To: None <firstname.lastname@example.org, email@example.com,>
From: None <kre@munnari.OZ.AU>
Date: 01/02/2005 18:57:00
>Synopsis: sysinst code dumps on invalid extended partition (mbr)
>Arrival-Date: Sun Jan 02 18:57:00 +0000 2005
>Originator: Robert Elz
>Release: NetBSD 1.6U (irrelevant send-pr system...)
Prince of Songkla University
System: NetBSD fuchsia.noi.kre.to 1.6U NetBSD 1.6U (FUCHSIA) #51: Wed Jul 23 16:06:08 ICT 2003 firstname.lastname@example.org.OZ.AU:/usr/obj/sys/FUCHSIA i386
All totally irrelevant. It is an i386 running 2.99.11 (Dec 22).
sysinst (i386) core dumps when it references what seems like it
should be an extended partition, but isn't.
Create an invalid "extended" partition. The way I almost certainly
managed that was using sysinst from a 1.5 or very early 1.6 vintage
system (may have even been 1.4) - what I really did was reinstall
an old drive I'd had sitting on a shelf for a while, and attempt to
use that to do a 2.99.11 install.
The drive had an MBR with 3 partitions. The first was a typical
wintrash (fat32) type. The second was "type 5". The third was
an old NetBSD partition. The "type 5" was once a swap space
area (for NetBSD - the NetBSD 'b' label used much of the space
inside it - and any other systems that wanted it). It got to be
type "5" because sysinst insisted I give it some value (non-zero if
I recall correctly)and I have absolutely no idea what the numbers
actually mean (I know what the number scheme means, just not which
values mean what) - so I just picked something I'd seen before.
It worked for years & years... (in fact, I thnk I still have a
few drives installed that have layouts just like this).
Use a -current (as of a week or so ago anyway) sysinst, attempt to
delete the old partitions that are no longer wanted - watch sysinst
dump core when it cannot find the internal label in the extended
partition that's supposed to say what is really there.
No idea, haven't looked ... simple workaround is to use fdisk to
delete the partition, aside from issuing a warning about the
invalid extended partition, it handled it with no problems.
This was from a 2.99.11 (-current) of December 22 (that is,
just before anoncvs took its holiday...) I haven't seen any
sysinst commits during the intervening period though.