linux-kernel - Re: [Xen-devel] [PATCH v2 0/3] xen/blkback: several fixes of resource management

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Message-ID: <20170607135234.GE31454@char.us.oracle.com>
Date:   Wed, 7 Jun 2017 09:52:34 -0400
From:   Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:     Steven Haigh <netwiz@....id.au>
Cc:     xen-devel@...ts.xen.org, Juergen Gross <jgross@...e.com>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        roger.pau@...rix.com
Subject: Re: [Xen-devel] [PATCH v2 0/3] xen/blkback: several fixes of
 resource management

On Wed, Jun 07, 2017 at 10:36:58PM +1000, Steven Haigh wrote:
> On Friday, 19 May 2017 1:28:46 AM AEST Juergen Gross wrote:
> > Destroying a Xen guest domain while it was doing I/Os via xen-blkback
> > leaked several resources, including references of the guest's memory
> > pages.
> > 
> > This patch series addresses those leaks by correcting usage of
> > reference counts and the sequence when to free which resource.
> > 
> > The series applies on top of commit 2d4456c73a487abe ("block:
> > xen-blkback: add null check to avoid null pointer dereference") in
> > Jens Axboe's tree kernel/git/axboe/linux-block.git
> > 
> > V2: changed flag to type bool in patch 1 (Dietmar Hahn)
> > 
> > Juergen Gross (3):
> >   xen/blkback: fix disconnect while I/Os in flight
> >   xen/blkback: don't free be structure too early
> >   xen/blkback: don't use xen_blkif_get() in xen-blkback kthread
> > 
> >  drivers/block/xen-blkback/blkback.c |  3 ---
> >  drivers/block/xen-blkback/common.h  |  1 +
> >  drivers/block/xen-blkback/xenbus.c  | 15 ++++++++-------
> >  3 files changed, 9 insertions(+), 10 deletions(-)
> 
> Just wanted to give this a bit of a prod.

<ugh> Ouch!

> 
> Is there any plans in having this hit the kernel.org kernels?

Yes.
> 
> My testing was purely on kernel 4.9 branch - but it doesn't look like this has 
> shown up there yet?

Correct. I am thinking to send these to Jens around June 20th or so.