[Bisected] PowerMac G5 fails booting kernel 6.6-rc3 (BUG: Unable to handle kernel data access at 0xfeffbb62ffec65fe)

Michael Ellerman mpe at ellerman.id.au
Thu Oct 12 10:47:51 AEDT 2023

Erhard Furtner <erhard_f at mailbox.org> writes:
> Greetings!
> Kernel 6.5.5 boots fine on my PowerMac G5 11,2 but kernel 6.6-rc3
> fails to boot with following dmesg shown on the OpenFirmware console
> (transcribed screenshot):

Thanks for transcribing all that :)

I don't see this crash on my quad G5.

I notice that your config has CONFIG_FLATMEM=y. Can you try switching to
SPARSEMEM and see if that helps? It might help us narrow down the bug at


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