Bug#784874: mdadm --re-add Segmentation Fault

[NeilBrown]

On Sun, 10 May 2015 01:37:09 +0200 Christoffer Hammarström
<christoffer.hammarstrom at linuxgods.com> wrote:

> Package: mdadm
> Version: 3.3.2-5
> Severity: normal
> 
> I was trying to re-add some disks to a RAID, and mdadm crashed with a segmentation fault.

While that is clearly a bug an should be fixed, I wonder what you were trying
to do ...

> Core was generated by `mdadm --manage /dev/md/storage --re-add /dev/sdg /dev/sdh /dev/sdi /dev/sdj'.

so you are trying to re-add 4 drives to /dev/md/storage.

> lrwxrwxrwx 1 root root 8 May  9 23:27 storage -> ../md126

/dev/md/storage is a link to /dev/md126, but:

> --- /proc/mdstat:
> Personalities : [raid1] [raid6] [raid5] [raid4] 
> md1 : active raid1 sdd[1] sdc[0]
>       3906887488 blocks super 1.2 [2/2] [UU]
>       bitmap: 0/30 pages [0KB], 65536KB chunk
> 
> md127 : active raid1 sde[0] sdf[1]
>       1953514496 blocks [2/2] [UU]
>       
> md0 : active raid1 sdb1[1] sda1[0]
>       976629760 blocks super 1.2 [2/2] [UU]
>       
> unused devices: <none>
> 

/dev/md126 doesn't exist.

--re-add is for when you have a degraded array and you want to add a failed
(or removed) device back into it.
It looks to me like you are trying to assemble an array which is not
currently active.  So

  mdadm --assemble /dev/md/storage /dev/sdg /dev/sdh /dev/sdi /dev/sdj

is probably the command that you want.

NeilBrown
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