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Date: Mon, 22 Jul 2002 12:23:35 -0600
From: Roe Peterson <roe@liveglobalbid.com>
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Subject: 2.5.27 raid1 bug...
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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?