linux-kernel - Re: [patch 32/37] CRYPTO: api: scatterwalk_copychunks() fails to advance through scatterlist

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Message-ID: <20070331031129.GA1784@suse.de>
Date:	Fri, 30 Mar 2007 20:11:29 -0700
From:	Greg KH <gregkh@...e.de>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Patrick McHardy <kaber@...sh.net>, linux-kernel@...r.kernel.org,
	stable@...nel.org, Justin Forbes <jmforbes@...uxtx.org>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	Theodore Ts'o <tytso@....edu>,
	Randy Dunlap <rdunlap@...otime.net>,
	Dave Jones <davej@...hat.com>,
	Chuck Wolber <chuckw@...ntumlinux.com>,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Michael Krufky <mkrufky@...uxtv.org>,
	Chuck Ebbert <cebbert@...hat.com>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	"J. Bruce Fields" <bfields@...i.umich.edu>
Subject: Re: [patch 32/37] CRYPTO: api: scatterwalk_copychunks() fails to
	advance through scatterlist

On Sat, Mar 31, 2007 at 12:14:37PM +1000, Herbert Xu wrote:
> On Sat, Mar 31, 2007 at 03:41:32AM +0200, Patrick McHardy wrote:
> >
> > > [CRYPTO] api: scatterwalk_copychunks() fails to advance through scatterlist
> > 
> > This patch seems to cause some problems, I get reproducable freezes
> > on the receiving system with net-2.6.22 when sending IPsec packets
> > larger than the mtu (reproduced about 10 times). Reverting this
> > patch seems to fix it. In a few cases the oops also occured on the
> > sending system.
> > 
> > Backtrace from UML (sending system):
> > 
> > uml:~# ping 10.0.0.1 -s 20000
> > PING 10.0.0.1 (10.0.0.1) 20000(20028) bytes of data.
> > BUG: soft lockup detected on CPU#0!
> > Call Trace:
> 
> Indeed.  That patch was buggy.  Sorry for not catching this earlier.
> 
> This should fix the problem.
> 
> [CRYPTO] api: Use the right value when advancing scatterwalk_copychunks
> 
> In the scatterwalk_copychunks loop, We should be advancing by
> len_this_page and not nbytes.  The latter is the total length.
> 
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

Is this an "add-on" patch, or a replacement one?

thanks,

greg k-h
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