From: Avi Kivity <avi@qumranet.com>
To: Max Krasnyansky <maxk@qualcomm.com>
Cc: LKML <linux-kernel@vger.kernel.org>, andrea@qumranet.com
Subject: Re: Circular vma locking with kvm, seems to be mmu notifiers related
Date: Wed, 13 Aug 2008 11:36:29 +0300 [thread overview]
Message-ID: <48A29D0D.9010801@qumranet.com> (raw)
In-Reply-To: <48A0D6A9.4030603@qualcomm.com>
Max Krasnyansky wrote:
> Got this on the latest mainline git.
> There are already a couple of lockdep/kvm threads. So maybe it's known.
>
> =============================================
> [ INFO: possible recursive locking detected ]
> 2.6.27-rc2 #36
> ---------------------------------------------
> qemu-system-x86/3445 is trying to acquire lock:
> (&anon_vma->lock){--..}, at: [<ffffffff8029f84d>] mm_take_all_locks+0x8d/0xf0
>
> but task is already holding lock:
> (&anon_vma->lock){--..}, at: [<ffffffff8029f84d>] mm_take_all_locks+0x8d/0xf0
>
>
Seems to be a false positive. mmu_take_all_locks takes (surprise!) all
anon_vma->locks belonging to an mm, and takes special care not to
deadlock while doing this.
We need to communicate this to lockdep somehow.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2008-08-13 8:36 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-12 0:17 Circular vma locking with kvm, seems to be mmu notifiers related Max Krasnyansky
2008-08-13 8:36 ` Avi Kivity [this message]
2008-08-13 8:49 ` Johannes Weiner
2008-08-13 9:01 ` Avi Kivity
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