Re: mdadm: sending ioctl 1261 to a partition!

[Steven Haigh <netwiz@crc.id.au>]

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



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