linux-kernel - Re: [linux-next:master] [mm,page_owner] 4bedfb314b: BUG:KASAN:null-ptr-deref_in_init_page

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Message-ID: <ZedlIv2ECH08KJcM@localhost.localdomain>
Date: Tue, 5 Mar 2024 19:32:02 +0100
From: Oscar Salvador <osalvador@...e.de>
To: Marco Elver <elver@...gle.com>
Cc: kernel test robot <oliver.sang@...el.com>, oe-lkp@...ts.linux.dev,
	lkp@...el.com, Linux Memory Management List <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vlastimil Babka <vbabka@...e.cz>,
	Andrey Konovalov <andreyknvl@...il.com>,
	Alexander Potapenko <glider@...gle.com>,
	Michal Hocko <mhocko@...e.com>, linux-kernel@...r.kernel.org
Subject: Re: [linux-next:master] [mm,page_owner] 4bedfb314b:
 BUG:KASAN:null-ptr-deref_in_init_page_owner

On Tue, Mar 05, 2024 at 02:02:35PM +0100, Marco Elver wrote:
> On Tue, 5 Mar 2024 at 10:26, Oscar Salvador <osalvador@...e.de> wrote:
> > Marco, could it be that stackdepot was too overloaded, that by the time
> > page_owner gets initialized, there are no more space for its stacks, and
> > hence return 0-handles?.
> 
> That's possible. But it's unclear to me what exactly happens. Are you
> able to reproduce the issue? (I haven't been able to because the
> config enables CFI which seems to cause other issues for me,
> presumably toolchain related. :-/ )

I am out of luck here, I cannot reproduce the issue.
I set up the environment just as [1] says, building the kernel with
their config and launching bin/lkp just as [1] states, but it
boots fine here.

[1] https://download.01.org/0day-ci/archive/20240305/202403051032.e2f865a-lkp@intel.com/reproduce

-- 
Oscar Salvador
SUSE Labs