linux-kernel - Re: btrfs "possible irq lock inversion dependency detected"

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Message-Id: <4F3CC8F0-C37E-4448-AF65-796E643A301B@colorremedies.com>
Date:	Mon, 17 Feb 2014 15:14:34 -0700
From:	Chris Murphy <lists@...orremedies.com>
To:	Tommi Rantala <tt.rantala@...il.com>
Cc:	Chris Mason <clm@...com>, Josef Bacik <jbacik@...com>,
	linux-btrfs@...r.kernel.org, Dave Jones <davej@...hat.com>,
	trinity@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: btrfs "possible irq lock inversion dependency detected"


On Feb 17, 2014, at 1:09 PM, Tommi Rantala <tt.rantala@...il.com> wrote:

> Hello,
> 
> Saw this while fuzzing the kernel with Trinity.
> 
> Tommi
> 
> 
> [  396.136048] =========================================================
> [  396.136048] [ INFO: possible irq lock inversion dependency detected ]
> [  396.136048] 3.14.0-rc3 #1 Not tainted
> [  396.136048] ---------------------------------------------------------
> [  396.136048] kswapd0/1482 just changed the state of lock:
> [  396.136048]  (&delayed_node->mutex){+.+.-.}, at: [<ffffffff8147b83b>] __btrfs_release_delayed_node+0x4b/0x1e0
> [  396.136048] but this lock took another, RECLAIM_FS-unsafe lock in the past:
> [  396.136048]  (&found->groups_sem){+++++.}

Looks like this is the same thing previously report on Btrfs list with 3.14.0-rc1 here:
https://bugzilla.redhat.com/show_bug.cgi?id=1062439

Which points to this:
https://bugzilla.redhat.com/show_bug.cgi?id=1062833#c24

Which points to this patch:
http://marc.info/?l=linux-netdev&m=139233546723342&q=raw


Chris Murphy--
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