Addition of a partition to an existing RAID1 array overwrites disk partition table

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System: Sun Blade 10002 x Fujitsu FC-AL disks (2 x 70 GBytes approx.)Using Sun Disk LabelsDebian Lenny, running 2.6.26-1-sparc64
RAID 1 already created (/dev/md0) with 2 units. One is removed./dev/sda is heavily partition (holds system partitions + 1 big datapartition -> sda8)/dev/sdb has just the default fdisk layout for the disk, with a big/dev/sdb1, small /dev/sdb2 and whole disk on /dev/sdb3
After running the following command: mdadm --add /dev/md0 /dev/sdb1,raid1 correctly starts replication of the array but somebody magicallymodifies the partition table of /dev/sdb!!!!!!!
Take a look at: http://pastebin.com/m341ee953. Real results executedsome minutes ago.
Is there something obvious my stupid brain is not seeing? I've alreadytried a search on kernel bugzilla and debian bugs, having not foundanything of interest.  Bug # 4211 is obviously not the problem here,as I'm adding the partition to the array, not the full disk. Can thisbe a bug?
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