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

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Message-ID: <CANMBJr41muA9mTNAa6MtWuMmeNLQxT4NjLe45=ExdFiH8vwzyw@mail.gmail.com>
Date:	Mon, 20 Jun 2016 09:56:45 -0700
From:	Tyler Baker <tyler.baker@...aro.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	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>,
	Sören Brinkmann <soren.brinkmann@...inx.com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	"Kevin's boot bot" <khilman@...nel.org>,
	Alex Bennée <alex.bennee@...aro.org>
Subject: Re: [PATCH v1 15/25] PCI: generic: Free resource list close to where
 it's allocated

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).

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