Re: 2.5.27 raid1 bug...

[Neil Brown]

On Monday July 22, [e-mail] wrote:
> 
> Okay, I've isolated a problem with raid1/md under 2.5.27...
> 
> Scenario:
> 
>     /dev/hda2 and /dev/hdb2 are unused partitions.
> 
> /etc/raidtab:
> raiddev  /dev/md0
> raid-level 1
> nr-raid-disks 2
> chunk-size 64k
> persistent-superblock 1
> nr-spare-disks 0
>  device /dev/hda2
>  raid-disk 0
>  device /dev/hdb2
>  raid-disk 1
> 
> mkraid /dev/md0
> 
> Fails with a kernel panic.  A bit of searching finds that this chunk of
> code (md.c, about line 850):
>      rdev = list_entry(&mddev->disks.next, mdk_rdev_t, same_set);
                         ^
>      sb = rdev->sb;
> 
>      memset(sb, 0, sizeof(*sb));
> 
> Is failing.  sb is == 1 !!
> 
> Anyone got any ideas?

Yep, that '&' is wrong.  Remove and it will work.

NeilBrown