Hi Aero,
Le 22/05/2019 à 00:18, Aaro Koskinen a écrit :
Hi,
I was trying to upgrade from v5.0 -> v5.1 on PowerBook G4, but when trying
to kexec a kernel the system gets stuck (no errors seen on the console).
Do you mean you are trying to kexec a v5.1 kernel from a v5.0 kernel, or
do you have a working v5.1 kernel, but kexec doesn't work with it ?
Bisected to: 93c4a162b014 ("powerpc/6xx: Store PGDIR physical address
in a SPRG"). This commit doesn't revert cleanly anymore but I tested
that the one before works OK.
Not sure that's the problem. There was a problem with that commit, but
it was fixed by 4622a2d43101 ("powerpc/6xx: fix setup and use of
SPRN_SPRG_PGDIR for hash32").
You probably hit some commit between those two during bisect, that's
likely the reason why you ended here.
Can you restart your bisect from 4622a2d43101 ?
If you have CONFIG_SMP, maybe you should also consider taking
397d2300b08c ("powerpc/32s: fix flush_hash_pages() on SMP"). Stable
5.1.4 includes it.
With current Linus HEAD (9c7db5004280), it gets a bit further but still
doesn't work: now I get an error on the console after kexec "Starting
new kernel! ... Bye!":
kernel tried to execute exec-protected page (...) - exploit attempt?
Interesting.
Do you have CONFIG_STRICT_KERNEL_RWX=y in your .config ? If so, can you
retry without it ?
Thanks
Christophe
A.
