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From: Ingo Molnar <mingo@elte.hu>
To: Daniel Walker <dwalker@mvista.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH -rt] free_pgtables deadlock
Date: Thu, 18 May 2006 10:03:09 +0200	[thread overview]
Message-ID: <20060518080308.GC30387@elte.hu> (raw)
In-Reply-To: <200605141604.k4EG4oQ1005635@dwalker1.mvista.com>


* Daniel Walker <dwalker@mvista.com> wrote:

> Following is a fix for this deadlock .
> 
> What's happening is task 2 holds the i_mmap_lock from unmap_region(), 
> then it enters zap_page_range() where it tried to acquire the locked 
> mmu_gathers percpu .
> 
> While task 1) holds the mmu_gathers percpu lock from unmap_region() 
> and then tried to aquire i_mmap_lock inside unlink_file_vma() .
> 
> It looks like it's possible to drop the mmu_gathers prior to calling 
> unlink_file_vma() , but it's only done if there's more than one vma .
> 
> This deadlock was seen by Deepak Saxena on an ARM Versatile board.

thanks, applied.

	Ingo

      reply	other threads:[~2006-05-18  8:03 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-05-14 16:04 [PATCH -rt] free_pgtables deadlock Daniel Walker
2006-05-18  8:03 ` Ingo Molnar [this message]

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