linux-kernel - Re: sk_lock: inconsistent {RECLAIM_FS-ON-W} -> {IN-RECLAIM

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Message-ID: <20090706105216.GA19124@gondor.apana.org.au>
Date:	Mon, 6 Jul 2009 18:52:16 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org,
	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Subject: Re: sk_lock: inconsistent {RECLAIM_FS-ON-W} -> {IN-RECLAIM_FS-W}
	usage

Wu Fengguang <fengguang.wu@...el.com> wrote:
> 
> This lockdep warning appears when doing stress memory tests over NFS.
> 
> page reclaim => nfs_writepage => tcp_sendmsg => lock sk_lock
> 
> tcp_close => lock sk_lock => tcp_send_fin => alloc_skb_fclone => page reclaim

Well perhaps not this particular path, but it is certainly possible
if an existing NFS socket dies and NFS tries to reestablish it.

I suggest that NFS should utilise the sk_allocation field and
set an appropriate value.  Note that you may have to patch TCP
so that it uses sk_allocation everywhere necessary, e.g., in
tcp_send_fin.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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