linux-kernel - Re: 2.6.24-rc6: possible recursive locking detected

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Message-ID: <20080105071205.GA28936@gondor.apana.org.au>
Date:	Sat, 5 Jan 2008 18:12:05 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Christian Kujau <lists@...dbynature.de>,
	linux-kernel@...r.kernel.org, jfs-discussion@...ts.sourceforge.net,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Davide Libenzi <davidel@...ilserver.org>
Subject: Re: 2.6.24-rc6: possible recursive locking detected

On Fri, Jan 04, 2008 at 09:30:49AM +0100, Ingo Molnar wrote:
>
> > > [ 1310.670986] =============================================
> > > [ 1310.671690] [ INFO: possible recursive locking detected ]
> > > [ 1310.672097] 2.6.24-rc6 #1
> > > [ 1310.672421] ---------------------------------------------
> > > [ 1310.672828] FahCore_a0.exe/3692 is trying to acquire lock:
> > > [ 1310.673238]  (&q->lock){++..}, at: [<c011544b>] __wake_up+0x1b/0x50
> > > [ 1310.673869]
> > > [ 1310.673870] but task is already holding lock:
> > > [ 1310.674567]  (&q->lock){++..}, at: [<c011544b>] __wake_up+0x1b/0x50
> > > [ 1310.675267]
> > > [ 1310.675268] other info that might help us debug this:
> > > [ 1310.675952] 5 locks held by FahCore_a0.exe/3692:
> > > [ 1310.676334]  #0:  (rcu_read_lock){..--}, at: [<c038b620>] net_rx_action+0x60/0x1b0
> > > [ 1310.677251]  #1:  (rcu_read_lock){..--}, at: [<c0388d60>] netif_receive_skb+0x100/0x470
> > > [ 1310.677924]  #2:  (rcu_read_lock){..--}, at: [<c03a7fb2>] ip_local_deliver_finish+0x32/0x210
> > > [ 1310.678460]  #3:  (clock-AF_INET){-.-?}, at: [<c038164e>] sock_def_readable+0x1e/0x80
> > > [ 1310.679250]  #4:  (&q->lock){++..}, at: [<c011544b>] __wake_up+0x1b/0x50

The net part might just be a red herring, since the problem is that
__wake_up is somehow reentering itself.

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