linux-kernel - Re: Kernel bug in 5.7 for PPC32 on PowerBook G4

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Message-ID: <3e3e2343-d674-02e0-7b23-81636b472641@csgroup.eu>
Date:   Sat, 23 May 2020 19:30:20 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Larry Finger <Larry.Finger@...inger.net>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>,
        ppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: Kernel bug in 5.7 for PPC32 on PowerBook G4 - bisected to commit
 697ece7

Hi Larry,

Le 23/05/2020 à 19:24, Larry Finger a écrit :
> Hi Christophe,
> 
> Although kernel 5.7.0-rc2 appeared to boot cleanly, it failed on my G4 
> when I tried to generate a new kernel. The following BUG message is logged:
> 

[...]

> 
> This problem was bisected to commit 697ece7 ("powerpc/32s: reorder Linux 
> PTE bits to better match Hash PTE bits").

Being reversed in new -rc , see 
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/87sgfsf4hs.fsf@mpe.ellerman.id.au/

> 
> If I had done more rigorous tests earlier, I would have found the bug 
> with more time to fix it before release of 5.7, but every other problem 
> I have found happened at boot, not when the machine had to swap.
> 
> Thanks,
> 
> Larry

Christophe