linux-kernel - Re: Btrfs lockdep with 3.15 merge window v3.14-751-g683b6c6f82a6

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Message-ID: <CA+5PVA5H_03YmiC-atypY34QsNTN_3a6iTbFKhgihc-bCEWfvw@mail.gmail.com>
Date:	Wed, 2 Apr 2014 15:35:33 -0400
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	dsterba@...e.cz
Cc:	Chris Mason <clm@...com>, jbacik@...com,
	linux-btrfs <linux-btrfs@...r.kernel.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: Re: Btrfs lockdep with 3.15 merge window v3.14-751-g683b6c6f82a6

On Wed, Apr 2, 2014 at 12:56 PM, Josh Boyer <jwboyer@...oraproject.org> wrote:
> On Wed, Apr 2, 2014 at 12:47 PM, David Sterba <dsterba@...e.cz> wrote:
>> On Tue, Apr 01, 2014 at 06:23:11PM -0400, Josh Boyer wrote:
>>> Below is a lockdep spew I have on a local VM running Linus' tree as of
>>> this afternoon.  The specific git commit is v3.14-751-g683b6c6f82a6.
>>
>>> [  295.349016]        CPU0                    CPU1
>>> [  295.349016]        ----                    ----
>>> [  295.349016]   lock(&found->groups_sem);
>>> [  295.349016]                                local_irq_disable();
>>> [  295.349016]                                lock(&delayed_node->mutex);
>>> [  295.349016]                                lock(&found->groups_sem);
>>> [  295.349016]   <Interrupt>
>>> [  295.349016]     lock(&delayed_node->mutex);
>>
>> Fixed by https://patchwork.kernel.org/patch/3894781/
>
> Thanks for the pointer!  I'll grab that and give it a shot on my VM.

FWIW, this does seem to make the issue go away in my VM after testing
it for a while.  Thanks again for the pointer.

josh
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