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

[NeilBrown]

On Sun, 16 Oct 2011 23:42:46 -0400 Daniel Kahn Gillmor
<dkg at fifthhorseman.net> wrote:

> 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:

Thanks.
The patch is now in the 'master' branch of the upstream git:
   git://neil.brown.name/mdadm/ master


NeilBrown


> 
> 
> 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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