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

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Message-ID: <26cd9e7f-3a78-4863-8e56-29c0454098e6@roeck-us.net>
Date: Mon, 23 Sep 2024 09:25:25 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
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

On 9/23/24 09:01, Geert Uytterhoeven wrote:
> 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:
> 

Interesting. I have a lot of debug and kunit test options enabled. Turns out
I can boot cleanly with an unmodified virt_defconfig, but the crash is seen
if I enable the various debug and test options. I attached the defconfig
I used for reference.

Guenter

Download attachment "defconfig.debug.gz" of type "application/gzip" (1181 bytes)