linux-kernel - Re: Weird hard disk noise on shutdown (bug #7674)

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Message-ID: <20070222135306.4eb757c2@lxorguk.ukuu.org.uk>
Date:	Thu, 22 Feb 2007 13:53:06 +0000
From:	Alan <alan@...rguk.ukuu.org.uk>
To:	"Francesco Pretto" <ceztko@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Weird hard disk noise on shutdown (bug #7674)

> However, i'm not still sure i enabled as much debugging info as i
> could in the kernel configuration. If you need more, please point me
> to precise configuration options.

You grabbed a lot of junk but you did grab this line

[17179682.560000] Synchronizing SCSI cache for disk sda: 

Which means sd_sync_cache got called and flushed the data to disk.

I don't think you can do the other needed debugging without a recompile.

The following will generate a vast amount of debug of which only the end
matters. You may well want to build a kernel this way, boot it with
init=/bin/sh and then at the shell prompt do "halt -f" so you don't get
too much debug

In include/linux/libata.h change

#undef ATA_DEBUG                /* debugging output */
#undef ATA_VERBOSE_DEBUG        /* yet more debugging output */

so both of the undef-s read define

#define ATA_DEBUG
#define ATA_VERBOSE_DEBUG

and recompile


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