linux-kernel - PROBLEM: first read of /dev/mcelog fails

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Date:	Wed, 10 Nov 2010 05:32:31 -0500
From:	Jon Masters <jonathan@...masters.org>
To:	andi@...stfloor.org
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: PROBLEM: first read of /dev/mcelog fails

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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