netdev - Re: nfs client lockdep warning

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Date:	Fri, 9 Jan 2009 17:23:33 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	"J. Bruce Fields" <bfields@...ldses.org>, netdev@...r.kernel.org,
	linux-nfs@...r.kernel.org, Trond Myklebust <trond@...app.com>,
	Ingo Molnar <mingo@...e.hu>, Nick Piggin <npiggin@...e.de>
Subject: Re: nfs client lockdep warning

On Fri, Jan 09, 2009 at 06:58:17AM +0100, Peter Zijlstra wrote:
>
> > > > > Jan  8 15:29:17 ying3 kernel:        [<c054bb26>] copy_from_user+0x36/0x90
> > > > > Jan  8 15:29:17 ying3 kernel:        [<c0737800>] memcpy_fromiovecend+0x60/0x90
> > > > > Jan  8 15:29:17 ying3 kernel:        [<c075ce9f>] ip_generic_getfrag+0x9f/0xb0
> > > > > Jan  8 15:29:17 ying3 kernel:        [<c075cb6b>] ip_append_data+0x6bb/0x950
> > > > > Jan  8 15:29:17 ying3 kernel:        [<c077cb0d>] udp_sendmsg+0x2bd/0x680
> > > > > Jan  8 15:29:17 ying3 kernel:        [<c07835f9>] inet_sendmsg+0x39/0x70
> > > > > Jan  8 15:29:17 ying3 kernel:        [<c072f0e6>] sock_sendmsg+0xd6/0x100
> > > > > Jan  8 15:29:17 ying3 kernel:        [<c072f485>] kernel_sendmsg+0x35/0x50
> > > > > Jan  8 15:29:17 ying3 kernel:        [<c07da698>] xs_send_kvec+0xa8/0xb0
> > > > > Jan  8 15:29:17 ying3 kernel:        [<c07da711>] xs_sendpages+0x71/0x210
> > > > > Jan  8 15:29:17 ying3 kernel:        [<c07dab30>] xs_udp_send_request+0x40/0x120
> > > > > Jan  8 15:29:17 ying3 kernel:        [<c07d91ff>] xprt_transmit+0x6f/0x280
> > > > > Jan  8 15:29:17 ying3 kernel:        [<c07d6c1f>] call_transmit+0x17f/0x250
> > > > > Jan  8 15:29:17 ying3 kernel:        [<c07dda13>] __rpc_execute+0x73/0x250
> 
> Is there anything pinning that user-space page, if not its free to
> fault, which would mean its a real warning... 

It's kernel memory, not user memory.  See xs_udp_send_request in
net/sunrpc.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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