Subject: PROBLEM: first read of /dev/mcelog fails
From: Jon Masters <jonathan@jonmasters.org>
To: andi@firstfloor.org
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Organization: World Organi[sz]ation of Broken Dreams
Date: Wed, 10 Nov 2010 05:32:31 -0500
Message-ID: <1289385151.3916.554.camel@constitution.bos.jonmasters.org>
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Hi Andi,

I recently took some time to look at the daemon side of mcelog. I found
a few issues with that[0] that I will detail in a separate mail, but I
am more concerned that in recent kernels, the first read() of the mcelog
device performed by mcelog after boot always fails. 100% reproducible on
several machines - mcelog client always bombs out in process() due to
getting a "no such device" error from the kernel read attempt.
The /dev/mcelog device exists, but the first read fails.

Can you do a fresh boot, run mcelog, and see what I mean?

Jon.

[0] ignoredev not documented, cache-error-trigger uses $CPUS_AFFECTED
when it should be $AFFECTED_CPUS, mcelog-client socket is always created
no matter what the config says (and not deleted on shutdown).


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