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[124.209.171.220]) by smtp.gmail.com with ESMTPSA id pb8-20020a17090b3c0800b00296bb0b2f57sm171494pjb.21.2024.02.05.05.25.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 05 Feb 2024 05:25:20 -0800 (PST) Date: Mon, 5 Feb 2024 22:25:15 +0900 From: Sergey Senozhatsky To: Petr Mladek Cc: "Paul E. McKenney" , Tejun Heo , Jonas Oberhauser , Lai Jiangshan , Steven Rostedt , John Ogness , Sergey Senozhatsky , Stephen Rothwell , linux-kernel@vger.kernel.org, rcu@vger.kernel.org Subject: Re: [BUG] workqueues and printk not playing nice since next-20240130 Message-ID: <20240205132515.GF69174@google.com> References: <410d6a87-bf34-457e-b714-1e6149d48532@paulmck-laptop> <25fd8537-5a27-4b62-9bf9-1ee7ca59b5b8@paulmck-laptop> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On (24/02/05 14:07), Petr Mladek wrote: > > Good point, if it does recur, I could try it on bare metal. > > Please, me, John, and Sergey know if anyone see this again. I do not > feel comfortable when there is problem which might make consoles calm. Agreed. > Bisection identified this commit: > 5797b1c18919 ("workqueue: Implement system-wide nr_active enforcement for unbound workqueues") That commit triggered early boot use-after-free (per kasan) on my system, which probably could derail some things.