Re: mdadm: sending ioctl 1261 to a partition!

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On 6/03/2012 7:01 AM, NeilBrown wrote:
On Tue, 06 Mar 2012 05:53:28 +1100 Steven Haigh<netwiz@xxxxxxxxx>  wrote:

On 6/03/2012 1:52 AM, John Robinson wrote:
On 05/03/2012 13:03, Steven Haigh wrote:
I've noticed that recently I've managed to get a ton of messages like
this at boot:

mdadm: sending ioctl 1261 to a partition!
mdadm: sending ioctl 800c0910 to a partition!

It's probably harmless.

http://lists.debian.org/debian-kernel/2012/01/msg01105.html says "This
warning was introduced as part of the fix for CVE-2011-4127"

https://bugzilla.redhat.com/show_bug.cgi?id=783955#c4 says "Actually,
the warning seems a false positive to me"

I did see these - and I probably should have mentioned it in the
original post. Naughty me for posting at times I should really be asleep.

The general jist of it seemed to be "it always failed before, now we
just know about it". What makes me wonder is that if it always failed
before, why do we do it in the first place?


800c0910 is 'are you an md device'.  So failure is a valid response.

1261 is flush-bufs.  I hope that does still work on partitions....

Thanks Neil, Any ideas how I can test this to check if flush-bufs is working? While I'm not a code junkie these days - I'm great at picking holes in thing ;)

I picked it up as it only seemed to be visible in 2.6.32.56. I don't recall seeing it in any previous 2.6.32.x kernel.

--
Steven Haigh

Email: netwiz@xxxxxxxxx
Web: http://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897
Fax: (03) 8338 0299


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