Re: install/38841: installer blow up FreeBSD's disklabel on other DOS partitions

[David Holland <dholland-bugs%netbsd.org@localhost>]

The following reply was made to PR install/38841; it has been noted by GNATS.

From: David Holland <dholland-bugs%netbsd.org@localhost>
To: matsunaw%ja2.so-net.ne.jp@localhost
Cc: gnats-bugs%NetBSD.org@localhost, install-manager%netbsd.org@localhost,
        gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
Subject: Re: install/38841: installer blow up FreeBSD's disklabel on other
        DOS partitions
Date: Sun, 22 Jun 2008 22:27:08 +0000

 On Thu, Jun 12, 2008 at 09:39:43AM +0900, matsunaw%ja2.so-net.ne.jp@localhost 
wrote:
  > >  The chief cause of problems like this is accidentally mistyping
  > >  partition sizes or offsets. Then you get overlapping partitions and
  > >  things get overwritten.
  > >  
  > >  Can you post the fdisk table and the other disklabels?
  > 
  > [...]
 
  > Disk /dev/ad4: 250.0 GB, 250059350016 bytes
  > 255 heads, 63 sectors/track, 30401 cylinders
  > Units = cylinders of 16065 * 512 = 8225280 bytes
  > 
  >     Device Boot    Start       End    Blocks   Id  System
  > /dev/ad4s1             1      6080  48837568+   5  Extended
  > /dev/ad4s2          6081     12160  48837600   a6  OpenBSD
  > /dev/ad4s3   *     12161     18240  48837600   a5  FreeBSD
  > /dev/ad4s4         18241     30401  97683232+  a5  FreeBSD
  > /dev/ad4s5             1        33    265009+  83  Linux
  > /dev/ad4s6            34      3925  31262458+  83  Linux
  > /dev/ad4s7          3926      6014  16779861   83  Linux
  > /dev/ad4s8          6015      6080    530113+  82  Linux swap
 
 Unless you tell this to print in sectors it's impossible to tell if
 the partition boundaries are correct. (And since the partition tables
 aren't the same as they were when things failed, looking at them now
 won't necessarily prove anything anyway.)
 
 Also, I don't think you've explained why ad4s2 has been changed to
 OpenBSD.
 
  > % disklabel -r /dev/ad4s2
  > # /dev/ad4s2:
  > 8 partitions:
  > #        size   offset    fstype   [fsize bsize bps/cpg]
  >   a: 16778160 97675200    4.2BSD        0     0     1 
  >   b:  2097270 114453360      swap                    
  >   c: 488397168        0    unused        0     0         # "raw" part, 
don't edit
  >   e: 16778160 116550630    4.2BSD        0     0     1 
  > 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 cover the whole unit!
  > disklabel: An incorrect partition c may cause problems for standard system 
utilities
  > partition e: offset past end of unit
  > partition e: partition extends past end of unit
 
 If this is really a NetBSD disklabel, printing it with NetBSD's
 disklabel utility will be much more likely to produce useful results.
 
 -- 
 David A. Holland
 dholland%netbsd.org@localhost