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Tue, 5 Mar 2024 18:37:23 +0000 (UTC) Received: from dovecot-director2.suse.de ([10.150.64.162]) by imap2.dmz-prg2.suse.org with ESMTPSA id TPZbLGNm52VDAQAAn2gu4w (envelope-from ); Tue, 05 Mar 2024 18:37:23 +0000 Date: Tue, 5 Mar 2024 19:38:42 +0100 From: Oscar Salvador To: Marco Elver Cc: kernel test robot , oe-lkp@lists.linux.dev, lkp@intel.com, Linux Memory Management List , Andrew Morton , Vlastimil Babka , Andrey Konovalov , Alexander Potapenko , Michal Hocko , linux-kernel@vger.kernel.org Subject: Re: [linux-next:master] [mm,page_owner] 4bedfb314b: BUG:KASAN:null-ptr-deref_in_init_page_owner Message-ID: References: <202403051032.e2f865a-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: 54CE7100017 X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: d9365yrdcptw9shjcj4n4geret3bdhfp X-HE-Tag: 1709663846-974312 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Mar 05, 2024 at 07:32:02PM +0100, Oscar Salvador wrote: > On Tue, Mar 05, 2024 at 02:02:35PM +0100, Marco Elver wrote: > > On Tue, 5 Mar 2024 at 10:26, Oscar Salvador 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. But they point out to commit 4bedfb314bdd85c1662ecc46fa25b33b998f994d (HEAD, bisection) Author: Oscar Salvador Date: Thu Feb 15 22:59:03 2024 +0100 mm,page_owner: maintain own list of stack_records structs which the only thing it does is to retrieve the stack_record for {dummy,failure}.handle and increment their refcount and link them. I am pretty sure the problem comes from either dummy_handle or failure_handle being 0 and the stack_record we get is NULL. I will come up with a patch to guard this scenario, although I did not think this could happen at this early stage (stack_records returning NULL). -- Oscar Salvador SUSE Labs