linux-kernel - Re: v4.17 regression: PowerMac G3 won't boot, was Re: [PATCH v5 1/3] of: cache phandle nodes to reduce cost of of_find_node_by

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAL_JsqLJ9QMHCMqGKpCouP1rTEO+cMGA1es94qAH+ukLsR31jg@mail.gmail.com>
Date:   Wed, 29 Aug 2018 20:05:47 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     fthain@...egraphics.com.au
Cc:     Frank Rowand <frank.rowand@...y.com>, userm57@...oo.com,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Chintan Pandya <cpandya@...eaurora.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: v4.17 regression: PowerMac G3 won't boot, was Re: [PATCH v5 1/3]
 of: cache phandle nodes to reduce cost of of_find_node_by_phandle()

On Wed, Aug 29, 2018 at 7:44 PM Finn Thain <fthain@...egraphics.com.au> wrote:
>
> Hi Frank,
>
> Linux v4.17 and later will no longer boot on a G3 PowerMac. The boot hangs
> very early, before any video driver loads.
>
> Stan and I were able to bisect the regression between v4.16 and v4.17 and
> arrived at commit 0b3ce78e90fc ("of: cache phandle nodes to reduce cost of
> of_find_node_by_phandle()").
>
> I don't see any obvious bug in 0b3ce78e90fc or b9952b5218ad. But if you
> revert these from v4.18 (which is also affected) that certainly resolves
> the issue.

Perhaps a bad assumption on phandle values causing a problem. Can you
provide a dump of all the phandle or linux,phandle values from
/proc/device-tree.

Rob