something wrong with dmesg?

Julian Elischer julian at
Thu Feb 16 22:15:13 UTC 2012

On 2/16/12 1:27 AM, Sergey Kandaurov wrote:
> On 16 February 2012 12:58, Julian Elischer<julian at>  wrote:
>> I just noticed that lately in 9.x and maybe 8-Stable, dmesg seems to return
>> nothing if
>> there is active logging going on. I saw someone else refer to this as well.
>> Has this been reported?
> Didn't we have this for years? I cannot recall there was a difference to the
> current behavior since 8.x or 7.x (or even 6.x).
> kern.msgbuf includes messages sent with syslog, and if they dominate
> then you might get empty dmesg output. By default it skips non-kernel
> (or rather those messages which doesn't use BSD syslog format)
> messages, and you can include them using dmesg -a.
I expect to see the output from all kernel 'printf' statements in dmesg.
they were definitely not turning up for me last week, but if I tried 
there would be contents,

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