linux-kernel - Re: kernel error : 'find /proc/ -type f

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Message-ID: <20100129134551.GR19799@ZenIV.linux.org.uk>
Date:	Fri, 29 Jan 2010 13:45:51 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Toralf F?rster <toralf.foerster@....de>,
	Alexey Dobriyan <adobriyan@...il.com>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	Zhang Rui <rui.zhang@...el.com>
Subject: Re: kernel error : 'find /proc/ -type f | xargs -n 1 head -c 10
	>/dev/null'

On Tue, Jan 26, 2010 at 02:17:32PM +0100, Jiri Kosina wrote:
> > > Please, find out which file is causing this, if it's reproducible.
> > > 
> > I reproduced the msg :
> > "ACPI: Please implement acpi_video_bus_ROM_seq_show" by :
> > by
> > $> head -c 10 /proc/acpi/video/VID/info
> > 
> > After suspend to disk and wakeup however the file /proc/acpi/video/VID/ROM was 
> > the culprit.
> > 
> > The trace however I can't reproduce until now.

*snort*
The message is caused by
        printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
        seq_printf(seq, "<TODO>\n");
in acpi_video_bus_ROM_seq_show(), so it's not surprising.  Shouldn't spew
to syslog, but other than that it's a non-issue.  Stack trace, OTOH, is
something very different; something is trying to generate 2Mb of contents
in a single ->show().  Which is definitely not that one - "<TODO>\n" is
not going to eat that much ;-)
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