linux-kernel - Re: [2.6.27.24] Kernel coredump to a pipe is failing

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Message-Id: <20090526162821.02e11d5b.akpm@linux-foundation.org>
Date:	Tue, 26 May 2009 16:28:21 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	andi@...stfloor.org, paul@...-scientist.net,
	linux-kernel@...r.kernel.org
Subject: Re: [2.6.27.24] Kernel coredump to a pipe is failing

On Wed, 27 May 2009 01:14:28 +0200
Andi Kleen <andi@...stfloor.org> wrote:

> On Tue, May 26, 2009 at 04:00:17PM -0700, Andrew Morton wrote:
> > dump_write() doesn't seem right, either.  If ->write() returns, say,
> > 100 then the dump should keep on going.  At present it treats this
> > return as an error.
> 
> I think that's correct actually. Short write typically means serious 
> issue like disk full or broken pipe, so stopping is good.

But we shouldn't assume that.  It could be that the ->write
implementation is perfectly able to absorb the remaining data.

We should only error out of the write() returned zero or -EFOO.
The current code is simply buggy, but got lucky.

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