Re: [Xen-API] XCP 1.0-beta: md on dom0 kernel causes kernel oops

[Tomoe Sugihara <sugihara@xxxxxxxxxxxxx>]

Hi guys,

On 12/02/2010 01:52 AM, Simon Rowe wrote:
> On Wednesday 01 Dec 2010 16:49:42 Jonathan Ludlam wrote:
>
> > Hum. I'm not too sure myself about kernel issues - Simon Rowe (cc'd) may be
> > able to help?
> Can you describe your setup a little more? What devices are under md?

Thanks for following up on this.
I tried the following two and both ended up with Oops.

1. just two regular HDDs --- /dev/sdc and /dev/sde or whatever.

   Here's how I reproduced just now.Very soon after dd, kernel panics.

    $ mdadm --create /dev/md0 --level=mirror --raid-devices=2 /dev/sdc /dev/sde   
    mdadm: /dev/sdc appears to be part of a raid array:
        level=raid1 devices=2 ctime=Mon Nov 29 15:52:53 2010
    mdadm: /dev/sde appears to be part of a raid array:
        level=raid1 devices=2 ctime=Mon Nov 29 09:34:34 2010
    Continue creating array? y
    mdadm: array /dev/md0 started.
    $ dd if=/dev/zero of=/dev/md0 bs=1M

     

2. dm linear devices which are on top of iscsi

  mdadm --create /dev/mirror/000008bc --auto=md --bitmap=internal --metadata=0 
--run --bitmap-chunk=65536 --delay=5   --level=1 --assume-clean 
--raid-devices=3 /dev/mapper/00000001-00000003 /dev/mapper/00000002-000002d7 
/dev/mapper/00000003-0000050a

   Interestingly, his doesn't cause kernel panic; similar stack trace shows up 
in dmsg and mdadm stalls.


Best,
Tomoe

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