linux-ext4 - Re: [RFC][PATCH] set_page_buffer_dirty should skip unmapped buffers

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Message-Id: <20060901101801.7845bca2.akpm@osdl.org>
Date:	Fri, 1 Sep 2006 10:18:01 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Badari Pulavarty <pbadari@...ibm.com>
Cc:	Anton Altaparmakov <aia21@....ac.uk>, sct@...hat.com,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [RFC][PATCH] set_page_buffer_dirty should skip unmapped buffers

On Fri, 01 Sep 2006 09:32:22 -0700
Badari Pulavarty <pbadari@...ibm.com> wrote:

> > > Kernel BUG at fs/buffer.c:2791
> > > invalid opcode: 0000 [1] SMP
> > > 
> > > Its complaining about BUG_ON(!buffer_mapped(bh)).

I need to have a little think about this, remember what _should_ be
happening in this situation.

We (mainly I) used to do a huge amount of fsx-linux testing on 1k blocksize
filesystems.  We've done something to make this start happening.  Part of
resolving this bug will be working out what that was.

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