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Mon, 23 Feb 2026 23:07:20 -0800 (PST) MIME-Version: 1.0 References: <20260223155128.3849-1-00107082@163.com> <6ca5f70c-43c5-4ba3-bdc4-8c48607dbe7c@suse.com> <37bbaa9.1831.19c8d7a2cac.Coremail.00107082@163.com> In-Reply-To: <37bbaa9.1831.19c8d7a2cac.Coremail.00107082@163.com> From: Suren Baghdasaryan Date: Mon, 23 Feb 2026 23:07:08 -0800 X-Gm-Features: AaiRm50pSRIhZaiQaKwsPZarmlJqkLnGOaw74W56Zri-xwPmiKiB_qeyEB6FjTQ Message-ID: Subject: Re: [7.0-rc1] codetag: kernel warning "alloc_tag was not set" during boot To: David Wang <00107082@163.com> Cc: Vlastimil Babka , vbabka@suse.cz, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Harry Yoo Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam09 X-Stat-Signature: pu7d7mdahpxftjzqw673g64jtkq917ez X-Rspamd-Queue-Id: 62160100005 X-Rspam-User: X-HE-Tag: 1771916841-44725 X-HE-Meta: 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 hbxi/rhy 0pZXB4I008TewILXHixb+X6jvsgxaw3jrkKDi4MRNGcKbROXHFmYCm+Z5fZzzpe+hBU7l0vmmYleJUJTv5tj/0p/8+HuJh6SlmNTJFDkuUlxc3XNFlN2CUxwh65jZGAyRwF+rYDXtBBoeE9EgbbRpL60m6OfKqrcnNm9aUL1CM6UdKglPGsAZtGJVZrFVXRgfjBgOo8fu0tfShFwOoU4bVKmLkXpiz+YwPrAqhV9mn0j7dEH+R0HBV6QiSTF2QNeEhenemimNIrgAp5AxivVPiXUMcdTT/0POT2wcp2TBoJM172ZqzuQ1k3B6OCSN/pwcu3SA/3uAkvntGT/LzBzZC2E5teVjptFB/+UhgH3bUIh1Zed49k9OndBd2IRggd9e7Ewxr8cTIJb3sRLAHz9ZkvX+cZ4CfDrpBpg1 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 Mon, Feb 23, 2026 at 6:28=E2=80=AFPM David Wang <00107082@163.com> wrote= : > > > At 2026-02-24 01:18:32, "Vlastimil Babka" wrote: > >On 2/23/26 16:51, David Wang wrote: > >> Hi, > >> > >> When upgrade to 7.0.0-rc1, caught a kernel WARN during boot: > > > >Would this possibly help? (it probably shouldn't but let's see) > >https://lore.kernel.org/all/20260223075809.19265-1-harry.yoo@oracle.com/ > > > > Hi, > I tried this patch, but sadly, it doesn't help with the warning on my sys= tem... Unfortunately I can't boot far enough with your config to get that warning. You might be able to track down which allocation does not get its tag by first checking for current->alloc_tag=3D=3DNULL inside __alloc_tagging_slab_alloc_hook() and dump the stack if that happens. If there are no hits (which is probably what will happen) you can do the same while checking for obj_exts=3D=3DNULL. I suspect that condition will hit multiple times and one of those will likely be the cause of this warning. I'll look into this more tomorrow if the cause is not found by then. > > >