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Mon, 04 Aug 2025 05:34:13 -0700 (PDT) Date: Mon, 4 Aug 2025 05:34:10 -0700 From: Breno Leitao To: Catalin Marinas Cc: Andrew Morton , Waiman Long , Gu Bowen , stable@vger.kernel.org, linux-mm@kvack.org, Lu Jialin Subject: Re: [PATCH] mm: Fix possible deadlock in console_trylock_spinning Message-ID: References: <20250730094914.566582-1-gubowen5@huawei.com> <20250801153303.cee42dcfc94c63fb5026bba0@linux-foundation.org> <5ca375cd-4a20-4807-b897-68b289626550@redhat.com> <20250801205323.70c2fabe5f64d2fb7c64fd94@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 6543C1A0016 X-Stat-Signature: shao9qsy5znsuz4pqp7rqppegcnicmn5 X-Rspam-User: X-HE-Tag: 1754310855-933093 X-HE-Meta: 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 ikx5wBEg cLNu3GvXvniREqknb3hmGbHU5z9RU4I4TAW65uAIsd6CJt4kPGoOiY2um9aGdOluUFokQEd84+WTFgg4YLs8+hbBYIMGQWb5wwd6WBIvdwhFPB/eyNDwJTh8jh12jZPXYT6nfFYq9sYU2l/9gIPAOUpQw0AlXmIRYjN4hN894MXgkYyqMXeHRFnGDlhG2imhOz8X3TNY8wKEUmEWy1owIjQZrFRT4SBMMSFOsklQ3ABXEIx2L/f8Fjhc37Vpf1G9aO05kzfE2zmf8XybPMnrUZNB/+IFl6RIQhCAk9rSU7IBJyULwmiPx2i/VrgI7CNZ0qF15srU7ZGtK8/gPdAwzhfN45j7j43ZLWkgWtJ1sJveU7XmQSzkrvrw2IJa6koHooY3VMIwGelqtH+7br9HamJLZUhnnLm3eZQ6KSO3dhGyn9cklULK6PxM6c98QvzILV/0YtbrK6RCGLDg= 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, Aug 04, 2025 at 01:08:15PM +0100, Catalin Marinas wrote: > I'm surprised we haven't seen these until recently. Has printk always > allocated memory? I can talk about netconsole, and the answer is yes! weird enought, lockdep never picked this issue, and I have a few set of hosts running kmemleak and lockdep for a while. This time was different because I have decided to invstiage the code, and found the deadlock. Still, no lockdep complain at all.