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

[Guenter Roeck]

On 9/23/24 09:01, Geert Uytterhoeven wrote:
> Hi Günter.
>
> On Mon, Sep 23, 2024 at 4:55 PM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> > On 9/23/24 06:47, Geert Uytterhoeven wrote:
> > > On Mon, Sep 23, 2024 at 3:39 PM Guenter Roeck <linux@xxxxxxxxxxxx> 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

Attachment: defconfig.debug.gz
Description: application/gzip