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Date: Tue, 8 Nov 2011 17:44:52 -0600
From: Clark Williams <williams@redhat.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
        linux-rt-users <linux-rt-users@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>, "Ted Ts'o" <tytso@mit.edu>,
        Greg KH <greg@kroah.com>
Subject: Re: [ANNOUNCE] 3.0.8-rt22
Message-ID: <20111108174452.497da95f@redhat.com>
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On Tue, 8 Nov 2011 22:02:32 +0100 (CET)
Thomas Gleixner <tglx@linutronix.de> wrote:

> On Tue, 8 Nov 2011, Clark Williams wrote:
> > Got the following splat on boot (f15 64-bit laptop, quad-core i7):
> >=20
> > [  146.609030]=20
> > [  146.609031] =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> > [  146.609033] [ INFO: possible circular locking dependency detected ]
> > [  146.609035] 3.0.8-rt22+ #27
> > [  146.609036] -------------------------------------------------------
> > [  146.609038] dconf-service/9046 is trying to acquire lock:
> > [  146.609040]  (&sb->s_type->i_mutex_key#13){+.+.+.}, at: [<ffffffff81=
1adcc4>] ext4_evict_inode+0x44/0x26f
> > [  146.609047]=20
> > [  146.609048] but task is already holding lock:
> > [  146.609049]  (&mm->mmap_sem){++++++}, at: [<ffffffff81108ee6>] sys_m=
unmap+0x36/0x5b
> > [  146.609053]=20
>=20
> That's an upstream problem which got pulled into 3.0 stable via commit
> 2526f36894 (upstream 2581fdc810) but lacks the followup upstream fix
>  .  The latter unfortunately has no Cc: stable tag ....
>=20
> Ted?
>=20
> Thanks,
>=20
> 	tglx


Thanks Thomas. I cherry-picked 8c0bec2, rebuilt with the same config
and have booted the resulting kernel with no lockdep splats.

Clark

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