linux-kernel - Re: [PATCH] resource, kunit: add dependency on SPARSEMEM

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Message-ID: <CAMuHMdVLLnaGKzKFTXST1qgTtJvYqDg109Yv6n4MJtu_ifvuoQ@mail.gmail.com>
Date: Mon, 23 Sep 2024 18:01:33 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Guenter Roeck <linux@...ck-us.net>
Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org, 
	Huang Ying <ying.huang@...el.com>
Subject: Re: [PATCH] resource, kunit: add dependency on SPARSEMEM

Hi Günter.

On Mon, Sep 23, 2024 at 4:55 PM Guenter Roeck <linux@...ck-us.net> wrote:
> On 9/23/24 06:47, Geert Uytterhoeven wrote:
> > On Mon, Sep 23, 2024 at 3:39 PM Guenter Roeck <linux@...ck-us.net> wrote:
> >> Interesting that you get that to boot. The q800 machine crashes for me
> >> when trying to boot it in qemu with the latest upstream kernel, in function
> >> __pte_offset_map_lock(). It bisects to commit 394290cba966 ("mm: turn
> >> USE_SPLIT_PTE_PTLOCKS / USE_SPLIT_PTE_PTLOCKS into Kconfig options").
> >> Reverting that patch fixes the crash for me. I guess you are not seeing that ?
> >
> > I never used qemu -M q800.
> > I have just verified that -M virt boots fine?
>
> Not for me :-(
>
> Run /sbin/init as init process
> Unable to handle kernel NULL pointer dereference at virtual address 00000014
> Oops: 00000000
> PC: [<000ca784>] __pte_offset_map_lock+0x36/0x7e
>
> This is with virt_defconfig.

Before, I was using my current development tree, which has lots of
local patches. So I retried with commit 394290cba966.
Boots fine into Debian:

root@...ian:~# cat /etc/issue
Debian GNU/Linux bullseye/sid \n \l

root@...ian:~# uname -r
6.11.0-rc6-virt-00033-g394290cba966
root@...ian:~#

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds