Date: Tue, 27 Nov 2007 13:34:43 +0000 From: Ceri Davies <ceri@submonkey.net> To: Bruce Cran <bruce@cran.org.uk> Cc: Giorgos Keramidas <keramida@ceid.upatras.gr>, questions@freebsd.org Subject: Re: Strange kernel log message Message-ID: <20071127133443.GA84516@submonkey.net> In-Reply-To: <474B2571.7090801@cran.org.uk> References: <20071126095833.GA6422@submonkey.net> <20071126112106.GC2283@kobe.laptop> <474B2571.7090801@cran.org.uk>
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On Mon, Nov 26, 2007 at 07:58:41PM +0000, Bruce Cran wrote:
> Giorgos Keramidas wrote:
>> On 2007-11-26 09:58, Ceri Davies <ceri@submonkey.net> wrote:
>>
>>> So I have this in my security run output:
>>> kernel log messages:
>>> +++ /tmp/security.hLYJI0kF Sun Nov 25 03:01:02 2007
>>> +<<<<222>2>>>NNNMNMMIII M III SIISAS SAAA 3 303,020,0 ,, EE
>>> IEIIESSSAIAA S A f ffffff
>>> +
>>> +
>>> +f
>>>
>>> WTF now?
>>>
>>> I'm not sure if that's a real kernel message that got garbled or whether
>>> I should be worried about naughtiness.
>>>
>>
>> It looks like multiple messages overlapping each other. Removing 3
>> characters every 4 bytes in the output produces things which seem
>> vaguely recognizable:
>>
>> <22NNI II A ,,,EISA fff
>> <<2>NMI SS 300 ISAAfff
>>
>> There's a sysctl option which you can tweak to make this less likely to
>> happen, but I am not sure about its name. Our console gurus can help
>> you track it down and tune its value :)
>
> The kernel option I've seen mentioned before to at least make this less
> common is:
>
> options PRINTF_BUFR_SIZE=128 # Prevent printf output being interspersed.
Aha, thanks guys.
Ceri
--
That must be wonderful! I don't understand it at all.
-- Moliere
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