linux-kernel - Re: [PATCH v2 2/4] xen-blkback: fix memory leaks

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Date:	Tue, 4 Feb 2014 10:32:44 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Roger Pau Monne <roger.pau@...rix.com>
CC:	<xen-devel@...ts.xenproject.org>, <linux-kernel@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Matt Rushton <mrushton@...zon.com>,
	Matt Wilson <msw@...zon.com>,
	Ian Campbell <Ian.Campbell@...rix.com>
Subject: Re: [PATCH v2 2/4] xen-blkback: fix memory leaks

On 04/02/14 10:26, Roger Pau Monne wrote:
> I've at least identified two possible memory leaks in blkback, both
> related to the shutdown path of a VBD:
> 
> - blkback doesn't wait for any pending purge work to finish before
>   cleaning the list of free_pages. The purge work will call
>   put_free_pages and thus we might end up with pages being added to
>   the free_pages list after we have emptied it. Fix this by making
>   sure there's no pending purge work before exiting
>   xen_blkif_schedule, and moving the free_page cleanup code to
>   xen_blkif_free.
> - blkback doesn't wait for pending requests to end before cleaning
>   persistent grants and the list of free_pages. Again this can add
>   pages to the free_pages list or persistent grants to the
>   persistent_gnts red-black tree. Fixed by moving the persistent
>   grants and free_pages cleanup code to xen_blkif_free.
> 
> Also, add some checks in xen_blkif_free to make sure we are cleaning
> everything.

Reviewed-by: David Vrabel <david.vrabel@...rix.com>

> +	if (log_stats)
> +		print_stats(blkif);

Unrelated to this series, but this log_stats stuff can be removed.

David
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