[arch-general] mdadm segfaults with kernel 2.6.38.2

[Norbert Zeh]

Divan Santana [2011.04.11 2132 +0200]:
> On Monday 11 April 2011 20:58:40 Norbert Zeh wrote:
> > I just upgraded to the latest kernel.  The /etc/rc.d/mdadm script, which
> > starts mdadm in monitor mode, reports a segmentation fault in
> > mdadm --monitor --oneshot --scan.
> > 
> > I also tried to manually start, e.g., mdadm --monitor /dev/md0, and get
> > a segmentation fault there, too.
> > 
> > Since this did not happen before the kernel upgrade and mdadm interacts
> > rather closely with the kernel, I suspect that some change in the latest
> > kernel is to blame for this.
> > 
> > Did anybody else run into the same problem?  
> 
> > Where would I start
> > debugging it?
> 
> Downgrade to 2.6.37.5/6 and confirm it's the kernel.
> Then search for a bug, join the bug report, or file one.

I had this on my to-do list already, but I appreciate the suggestion.
Now, the good news is: it's not the kernel, as the same thing happens
with the kernel I was running previously: 2.6.37.5.

The bad news: it still happens, and I think I know the culprit.  mdadm
was upgraded along with my kernel upgrade.  So occam's razor suggests
the new version of mdadm itself is to blame for the segfault.
Unfortunately, while I diligently keep old versions of my kernel
package, I don't have the previous version of mdadm lying around to
investigate this further.  Any suggestions?

Cheers,
Norbert