linux-kernel - Re: Soft-Lockup/Race in networking in 2.6.31-rc1+195 (possibly caused by netem)

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Message-ID: <20090702093031.GC4954@ff.dom.local>
Date:	Thu, 2 Jul 2009 09:30:31 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Andres Freund <andres@...razel.de>
Cc:	LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
	Stephen Hemminger <shemminger@...tta.com>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: Soft-Lockup/Race in networking in 2.6.31-rc1+195 (possibly
	caused by netem)

On Thu, Jul 02, 2009 at 02:37:24AM +0200, Andres Freund wrote:
...
> So I tried - and I did not catch any lockdep output before the crash.  
> Unfortunately I do not have another machine on the same local network to  
> catch any messages after the crash... So I could be missing some warning  
> (I did synchronous logging though).
> Will check with netconsole tomorrow.

Could you try if this patch changes anything?

Thanks,
Jarek P.
---

 net/sched/sch_netem.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index 2b88295..6001ad9 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -176,8 +176,6 @@ static int netem_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 		return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
 	}
 
-	skb_orphan(skb);
-
 	/*
 	 * If we need to duplicate packet, then re-insert at top of the
 	 * qdisc tree, since parent queuer expects that only one
--
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