linux-kernel - Re: [PATCH v1 15/25] PCI: generic: Free resource list close to where it's allocated

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Date:	Mon, 20 Jun 2016 18:22:40 +0100
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	Tyler Baker <tyler.baker@...aro.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Rob Herring <robh@...nel.org>,
	Jason Cooper <jason@...edaemon.net>,
	Scott Branden <sbranden@...adcom.com>,
	Jon Mason <jonmason@...adcom.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Pratyush Anand <pratyush.anand@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	rfi@...ts.rocketboards.org, linux-renesas-soc@...r.kernel.org,
	Simon Horman <horms@...ge.net.au>,
	Thierry Reding <thierry.reding@...il.com>,
	Tanmay Inamdar <tinamdar@....com>, Ray Jui <rjui@...adcom.com>,
	linux-tegra@...r.kernel.org, Ley Foon Tan <lftan@...era.com>,
	Michal Simek <michal.simek@...inx.com>,
	S??ren Brinkmann <soren.brinkmann@...inx.com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Kevin's boot bot <khilman@...nel.org>,
	Alex Benn??e <alex.bennee@...aro.org>
Subject: Re: [PATCH v1 15/25] PCI: generic: Free resource list close to where
 it's allocated

On Mon, Jun 20, 2016 at 09:56:45AM -0700, Tyler Baker wrote:
> Hi Bjorn,
> 
> On 6 June 2016 at 16:06, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> > Previously we allocated the PCI resource list in
> > gen_pci_parse_request_of_pci_ranges(), but if we had an error, we freed it
> > on error in gen_pci_init().
> >
> > Reorder gen_pci_init() so we can take care of error path cleanup in
> > gen_pci_parse_request_of_pci_ranges() instead.
> >
> > Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> 
> The kernelci.org bot has reported[0] new qemu-aarch64
> (arm64-defconfig) boot failures[1][2] in next-20160620. I've
> bisected[3] this boot failure down to this patch, and confirmed
> reverting it on top of next-20160620 resolves the boot issue.
> 
> I have not investigated further, but you can easily reproduce[4] the
> boot failure on an x86 host running qemu-system-aarch64 (I'm running
> qemu-system 2.6).

That's most likely because pci_ecam_create() requires the bus_range
resource (its busr parameter) to be initialized when it is called
and that's not the case after this patch is applied if I read it
correctly.

It is probably a NULL pointer dereference in pci_ecam_create().

Thanks,
Lorenzo

> 
> Cheers,
> 
> Tyler
> 
> [0] https://kernelci.org/boot/all/job/next/kernel/next-20160620/
> [1] https://storage.kernelci.org/next/next-20160620/arm64-defconfig/lab-cambridge/boot-apm-mustang-kvm-guest.txt
> [2] https://storage.kernelci.org/next/next-20160620/arm64-defconfig/lab-tbaker/boot-qemu-aarch64,legacy.txt
> [3] http://hastebin.com/segiruribu.vbs
> [4] http://hastebin.com/dafuzicuyi.avrasm
> --
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