linux-kernel - Re: Regression in 4.9-rc1 for PPC32 - bisected to commit 05fd007e4629

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Message-ID: <bdca8163-91cd-b51e-11a1-2a8ebe0fc359@lwfinger.net>
Date:   Mon, 24 Oct 2016 14:14:44 -0500
From:   Larry Finger <Larry.Finger@...inger.net>
To:     Paul Burton <paul.burton@...tec.com>
Cc:     Thorsten Leemhuis <regressions@...mhuis.info>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Regression in 4.9-rc1 for PPC32 - bisected to commit 05fd007e4629

On 10/24/2016 11:29 AM, Paul Burton wrote:
> On Monday, 24 October 2016 11:04:58 BST Larry Finger wrote:
>> On 10/23/2016 05:48 AM, Thorsten Leemhuis wrote:
>>> Hi! On 20.10.2016 07:55, Larry Finger wrote:
>>>> Kernel 4.9-rc1 fails to boot on my PowerBook G4 Aluminum (32-bit PowerPC)
>>>> with the following splat:
>>>> Kernel Panic - not synching: Attempted to kill init: exitcode =
>>>> 0x00000200
>>>
>>> Thx for CCing regressions@...mhuis.info I added this report to the list
>>> of regressions for Linux 4.9. I'll watch this thread for further updates
>>> on this issue to document progress in my weekly reports. Please let me
>>> know in case the discussion moves to a different place (bugzilla or
>>> another mail thread for example). tia!
>>>
>>> Ciao, Thorsten
>>
>> Thorsten,
>>
>> I would have CCd regressions with my previous postings if I had known the
>> address. The only place I had seen reference to it was on LKML where the
>> address is carefully obscured.
>>
>> If I have not heard from the developers regarding this issue by Friday, I
>> will be submitting a request for reversion of the patch in question.
>>
>> Larry
>
> Hi Larry,
>
> This was already reported over here:
>
> https://www.linux-mips.org/archives/linux-mips/2016-10/msg00130.html
>
> I posted an attempted fix there but it didn't work for Andreas. I'll try to
> find some more time to look at it but it's difficult since I don't have access
> to the affected hardware.

Paul,

Thanks for alerting me to that other thread. Please CC me on future 
communications there, as I do not read that ML.

For completeness, that patch failed here as well.

I'm not sure that my problem is exactly the same as the one Andreas sees. I do 
get console output from the bootup, but I do see a kernel panic because the 
system is trying to kill init. 	It seems likely that this happens because we are 
on the wrong console (udbg0) rather than tty0.

My DT shows the following lines with "stdout":

==> /proc/device-tree/chosen/linux,stdout-path <==
/pci@...00000/ATY,JasperParent@...ATY,Jasper_A@0^@
==> /proc/device-tree/chosen/linux,stdout-package <==
ÿ<9e>+P
==> /proc/device-tree/chosen/stdout <==
ÿ»¯À

My PowerBook is only used for testing, mainly to check that wireless drivers 
work correctly on BE architecture, but I do find a few problems with changes 
that behave differently on Apple hardware. I will be happy to provide any 
diagnostics that will be useful.

Larry