From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: [BISECTED] kexec regression on PowerBook G4
Date: Wed, 22 May 2019 08:14:23 +0200 [thread overview]
Message-ID: <90f3557b-400b-60b5-9ff8-d5605adeee79@c-s.fr> (raw)
In-Reply-To: <20190521221859.GC3621@darkstar.musicnaut.iki.fi>
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.
>
next prev parent reply other threads:[~2019-05-22 6:15 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-21 22:18 [BISECTED] kexec regression on PowerBook G4 Aaro Koskinen
2019-05-22 6:14 ` Christophe Leroy [this message]
2019-05-22 7:44 ` Christophe Leroy
2019-05-22 20:13 ` Aaro Koskinen
2019-05-22 20:33 ` LEROY Christophe
[not found] ` <20190522211724.GC456@darkstar.musicnaut.iki.fi>
2019-05-23 5:24 ` [RFC PATCH] powerpc: fix kexec failure on book3s/32 Christophe Leroy
2019-05-23 5:33 ` [BISECTED] kexec regression on PowerBook G4 Christophe Leroy
2019-05-23 17:27 ` Aaro Koskinen
2019-05-23 18:58 ` Christophe Leroy
2019-05-23 22:23 ` Aaro Koskinen
2019-05-24 5:46 ` Christophe Leroy
2019-05-24 6:08 ` Christophe Leroy
2019-05-24 7:36 ` Aaro Koskinen
2019-05-24 7:40 ` Christophe Leroy
2019-05-24 13:29 ` Aaro Koskinen
2019-05-24 13:35 ` Christophe Leroy
2019-05-24 6:05 ` [RFC PATCH v2] powerpc: fix kexec failure on book3s/32 Christophe Leroy
2019-05-24 13:38 ` Christophe Leroy
2019-05-22 20:07 ` [BISECTED] kexec regression on PowerBook G4 Aaro Koskinen
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