Bug#645563: mdadm: segmentation fault when converting raid10 to raid0

[Daniel Kahn Gillmor]

On 10/16/2011 09:55 PM, NeilBrown wrote:
> On line 1556 for Grow.c you'll find something like:
> 
> 		/* FIXME this is added with no justification - why is it here */
> 		ping_monitor(container);
> 
> Change  that to
> 		if (container)
> 			ping_monitor(container);
> 
> and the problem should go away.

I can confirm that it does go away if this change is made:


0 root at bigpuff:/home/raidtest# cat /proc/mdstat
Personalities : [raid10]
md0 : active raid10 loop3[3] loop2[2] loop1[1] loop0[0]
      203776 blocks super 1.2 512K chunks 2 near-copies [4/4] [UUUU]

unused devices: <none>
0 root at bigpuff:/home/raidtest# mdadm /dev/md0 --grow --level 0
mdadm: level of /dev/md0 changed to raid0
0 root at bigpuff:/home/raidtest# cat /proc/mdstat
Personalities : [raid10] [raid0]
md0 : active raid0 loop3[3] loop1[1]
      203776 blocks super 1.2 512k chunks

unused devices: <none>
0 root at bigpuff:/home/raidtest#

Thanks for the quick response,

	--dkg

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