4.14: Regression on ppc32 (early crash)

4.14: Regression on ppc32 (early crash)

[Christoph Biedl]

Hello,

on both my ppc32 systems I've tested (G4 PowerMac and G4 Mac-mini), I
see a regression after upgrading from 4.14.74 to 4.14.76: Very soon
after starting the kernel from yaboot, they drop me into a OF prompt,
message is "invalid memory access at" on the mini, and another one I
forgot on the PowerMac. FWIW, the ppc64 G5 PowerMac does fine.

Before I start bisecting - might take a few days -, is this already on
radar?

    Christoph

Re: 4.14: Regression on ppc32 (early crash)

[Greg KH]

On Tue, Oct 16, 2018 at 08:05:23AM +0200, Christoph Biedl wrote:
> Hello,
> 
> on both my ppc32 systems I've tested (G4 PowerMac and G4 Mac-mini), I
> see a regression after upgrading from 4.14.74 to 4.14.76: Very soon
> after starting the kernel from yaboot, they drop me into a OF prompt,
> message is "invalid memory access at" on the mini, and another one I
> forgot on the PowerMac. FWIW, the ppc64 G5 PowerMac does fine.
> 
> Before I start bisecting - might take a few days -, is this already on
> radar?

I have not heard of this, sorry.

Does the latest 4.18.y and/or the latest 4.19-rc8 release have this same
problem for you?

thanks,

greg k-h

Re: 4.14: Regression on ppc32 (early crash)

[Christoph Biedl]

Greg KH wrote...

> On Tue, Oct 16, 2018 at 08:05:23AM +0200, Christoph Biedl wrote:

> > on both my ppc32 systems I've tested (G4 PowerMac and G4 Mac-mini), I
> > see a regression after upgrading from 4.14.74 to 4.14.76: Very soon
> > after starting the kernel from yaboot, they drop me into a OF prompt,
> > message is "invalid memory access at" on the mini, and another one I
> > forgot on the PowerMac. FWIW, the ppc64 G5 PowerMac does fine.
> > 
> > Before I start bisecting - might take a few days -, is this already on
> > radar?
> 
> I have not heard of this, sorry.
> 
> Does the latest 4.18.y and/or the latest 4.19-rc8 release have this same
> problem for you?

FWIW, both systems are back to normal in 4.14.78 - as there have been
changes in the powerpc area, they probably did the right thing. And
while it was an interesting project to dig further, I afraid I lack the
time to actually do this.

Thanks for your attention in that matter.

    Christoph