Bug#478238: grub-probe: fails to find drive for /dev/sda10

[Robert Millan]

On Sun, May 04, 2008 at 05:01:32PM +0300, Török Edwin wrote:
> >>
> >>    Device Boot      Start         End      Blocks   Id  System
> >> /dev/sda1   *           1        1275    10241406    7  HPFS/NTFS
> >> /dev/sda2            1276        2248     7815622+  a6  OpenBSD
> >> /dev/sda3            2249        5289    24426832+   f  W95 Ext'd (LBA)
> >> /dev/sda4            6080        7296     9775552+  bf  Solaris
> >> /dev/sda5            2249        2371      987966   82  Linux swap / Solaris
> >> /dev/sda6            2372        3587     9767488+  83  Linux
> >> /dev/sda7            3588        3600      104391   83  Linux
> >> /dev/sda8            3601        4863    10145016   8e  Linux LVM
> >> /dev/sda9            4864        5228     2931831   a6  OpenBSD
> >> /dev/sda10           5229        5289      489951   83  Linux
> [...]
> grub> ls (hd0,10)
> error: unknown device
> grub> ls (hd0,11)
> error: unknown device
> grub>

I tried reproducing your setup, but I can't hit the same bug.  This starts to
look really nasty.  Just spotted this:

  /build/buildd/grub2-1.96+20080426/partmap/pc.c:141: partition 0: flag 0x80, type 0x7, start 0x3f, len 0x1388afc
  [...]
  /build/buildd/grub2-1.96+20080426/partmap/pc.c:141: partition 0: flag 0x0, type 0x82, start 0x2270f07, len 0x1e267c

for which I can't find any explanation other than memory corruption.  Also,
due to a missing fflush() call the output is somewhat scrambled, which makes
it harder to track (I fixed this already in upstream).

Could you:

  - Apply the attached patch & run grub-probe again (this time output
    will be a bit more readable)

  - Send it to grub-devel at gnu.org

  ?

Maybe someone there has an idea, but if it's memory corruption and we can't
reproduce it, tracing the problem remotely isn't going to work very well.

Thank you

-- 
Robert Millan

<GPLv2> I know my rights; I want my phone call!
<DRM> What use is a phone call… if you are unable to speak?
(as seen on /.)