Date: Fri, 3 Mar 2006 09:53:37 +0100 (CET)
From: Simon Derr <Simon.Derr@bull.net>
To: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: Simon Derr <Simon.Derr@bull.net>, linux-kernel@vger.kernel.org,
       FACCINI BRUNO <Bruno.Faccini@bull.net>
Subject: Re: Deadlock in net/sunrpc/sched.c
In-Reply-To: <1141321512.10398.13.camel@netapplinux-10.connectathon.org>
Message-ID: <Pine.LNX.4.61.0603030943160.15393@openx3.frec.bull.fr>
References: <Pine.LNX.4.61.0603021116030.15393@openx3.frec.bull.fr>
 <1141321512.10398.13.camel@netapplinux-10.connectathon.org>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 875
Lines: 26

On Thu, 2 Mar 2006, Trond Myklebust wrote:

> > Now to exit this loop, B needs to reach __rpc_do_wake_up_task() where a 
> > list_del will occur. But for this the RPC_TASK_WAKEUP must be released by 
> > process A, and this won't happen until process B releases the queue 
> > spinlock. --> deadlock.
> 
> Could you see if this fixes it?
> 
> Cheers,
>   Trond


Thanks, I will apply it.
But don't hold your breath though, this happened on a large cluster with 
high security and restricted access so I can't just try it like I would 
on my desktop machine.
There will probably be several weeks before I get back to you.

	Simon.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/