i386/57673: Odd/dangerous disklabel behaviour on 5.0 and 5.1-CURRENT

[Guy Van Sanden]

>Number:         57673
>Category:       i386
>Synopsis:       Odd/dangerous disklabel behaviour on 5.0 and 5.1-CURRENT
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Oct 06 12:10:17 PDT 2003
>Closed-Date:
>Last-Modified:
>Originator:     Guy Van Sanden
>Release:        FreeBSD 5.1-RELEASE i386
>Organization:
>Environment:
System: FreeBSD nemesis.home.vsb 5.1-RELEASE FreeBSD 5.1-RELEASE #0: Thu Jun 5 02:55:42 GMT 2003 ro
ot at wv1u.btc.adaptec.com:/usr/obj/usr/src/sys/GENERIC i386


        <machine, os, target, libraries (multiple lines)>
>Description:
Disklabel ignores the first 63 sectors of my Harddisk (I've seen this problem on the mailing list before)
[root at nemesis mail]# disklabel -r /dev/ad0s1a
# /dev/ad0s1a:
8 partitions:
#        size   offset    fstype   [fsize bsize bps/cpg]
  a:  1228800       63    4.2BSD     2048 16384 11272
  b:  1006432  1228863      swap
  c: 78165297       63    unused        0     0         # "raw" part, don't edit
  d:  1024000  2235295    4.2BSD     2048 16384 64008
  e:   921600  3259295    4.2BSD     2048 16384 57608
  f: 20971520  4180895    4.2BSD     2048 16384 28552
  g: 53012945 25152415    4.2BSD     2048 16384 28552
partition a: partition extends past end of unit
partition b: offset past end of unit
partition b: partition extends past end of unit
partition c: partition extends past end of unit
disklabel: partition c doesn't start at 0!
disklabel: partition c doesn't cover the whole unit!
disklabel: An incorrect partition c may cause problems for standard system utilities
partition d: offset past end of unit
partition d: partition extends past end of unit
partition e: offset past end of unit
partition e: partition extends past end of unit
partition f: offset past end of unit
partition f: partition extends past end of unit
partition g: offset past end of unit
partition g: partition extends past end of unit

The slices were created by sysinstall itself.
This problem is reproducable between 5.0 and 5.1

The system is a Digital PC3500 (PII 333) with two 40 GB drives.
The primary drive is WDC WD-400EB, the second is IBM IC35L040A

This system used to run FreeBSD 4.6.2 without this problem.

>How-To-Repeat:
        No idea if this would affect other machines.
>Fix:

	unknown



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