From: Jarek Poplawski <jarkao2@o2.pl>
To: "Yuriy N\. Shkandybin" <jura@netams.com>
Cc: akpm@linux-foundation.org, netdev@vger.kernel.org,
paulus@samba.org, greearb@candelatech.com,
mostrows@speakeasy.net, davem@davemloft.net
Subject: Re: [PATCH] vlan: lockdep subclass for ppp _xmit_lock Re: ppp_generic: fix lockdep warning
Date: Thu, 10 May 2007 07:30:52 +0200 [thread overview]
Message-ID: <20070510053052.GA1611@ff.dom.local> (raw)
In-Reply-To: <001801c79275$80cd5e00$0701010a@note>
On Thu, May 10, 2007 at 12:06:09AM +0400, Yuriy N. Shkandybin wrote:
> After applying this patch i've got this:
>
> =======================================================
> [ INFO: possible circular locking dependency detected ]
> 2.6.21-gentoo #2
> -------------------------------------------------------
> ospfd/3984 is trying to acquire lock:
> (&ppp->wlock){-...}, at: [<ffffffff803512a0>] ppp_xmit_process+0x20/0x4f0
>
> but task is already holding lock:
> (&dev->_xmit_lock){-+..}, at: [<ffffffff8038d778>] __qdisc_run+0x88/0x1c3
>
> which lock already depends on the new lock.
Thanks Yuriy!
As a matter of fact I suspected there will be something more.
Lockdep always stops working after the first warning, and you
have some very interesting (entangled) configuration, so each
fix could uncover new warnings.
I need some time to figure out this one, so I'd try to use your
help yet... I hope it's only about lockdep warnings and there
are no real lockups.
Best regards,
Jarek P.
next prev parent reply other threads:[~2007-05-10 5:24 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-26 7:27 [patch 10/15] ppp_generic: fix lockdep warning akpm
2007-04-26 8:39 ` David Miller
2007-04-26 10:49 ` Jarek Poplawski
2007-05-09 9:35 ` [PATCH] vlan: lockdep subclass for ppp _xmit_lock " Jarek Poplawski
2007-05-09 9:32 ` David Miller
2007-05-09 13:13 ` [PATCH (take 2)] vlan: lockdep class " Jarek Poplawski
2007-05-09 20:06 ` [PATCH] vlan: lockdep subclass " Yuriy N. Shkandybin
2007-05-10 5:30 ` Jarek Poplawski [this message]
2007-05-10 6:03 ` Yuriy N. Shkandybin
2007-05-10 6:39 ` Jarek Poplawski
2007-05-11 7:00 ` [PATCH] ppp_generic: lockdep class " Jarek Poplawski
2007-04-26 10:04 ` [patch 10/15] " Paul Mackerras
2007-04-26 11:28 ` Jarek Poplawski
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