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[23.128.96.32]) by mx.google.com with ESMTPS id c4-20020a170902aa4400b001b8922e82e3si1821067plr.297.2023.10.17.07.13.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Oct 2023 07:13:46 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.32 as permitted sender) client-ip=23.128.96.32; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=casper.20170209 header.b=WPjVQWPS; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.32 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by agentk.vger.email (Postfix) with ESMTP id DC6AF80C2561; Tue, 17 Oct 2023 07:13:43 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at agentk.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343948AbjJQONg (ORCPT + 99 others); Tue, 17 Oct 2023 10:13:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48220 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233670AbjJQONf (ORCPT ); Tue, 17 Oct 2023 10:13:35 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C14D4EA for ; Tue, 17 Oct 2023 07:13:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=qv/q2jRKci67EaYvl/g4SHwh75inWamJyzD52C/KScw=; b=WPjVQWPS1dqhKQcMI092Amozl0 FxIDiWFEaM4K6LIk3eNIrWJ5ifOT0DCEh54B2/LU96oJgXTq0GrIx1GT8i2ObY1uAjCS0Olrx2I7l 8yNF0RotJAsKSqQiGz2CqMLa2gwHhgG4pSldGjmboxM3FIhHFh20CoLkqzpu3ahhkUnNAhooXI83N ao98iKQsdnpCZ+F9n1cuW0GCRw1ooud6oldRdZmzWP0w/+gRN/Gut+ggGzfAx/Tj1ykCEXqDON/0Z 0Ig7Amn/dzjOzesO5mP0SnZkomrdznP3y6SGlYkiQ8O4P1S4PuWCtcpG4P/xHp6RKBAx1kkLObVbJ 5wKLSfzQ==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qskp4-00CmCC-Uh; Tue, 17 Oct 2023 14:13:27 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 6277230047C; Tue, 17 Oct 2023 16:13:26 +0200 (CEST) Date: Tue, 17 Oct 2023 16:13:26 +0200 From: Peter Zijlstra To: Aleksandr Nogikh Cc: syzbot , Benjamin Segall , linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, Dmitry Vyukov Subject: Re: [syzbot] [kernel?] possible deadlock in console_flush_all (2) Message-ID: <20231017141326.GB1599@noisy.programming.kicks-ass.net> References: <000000000000e40a2906072e9567@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-0.8 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on agentk.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (agentk.vger.email [0.0.0.0]); Tue, 17 Oct 2023 07:13:44 -0700 (PDT) On Tue, Oct 17, 2023 at 12:06:12PM +0200, Aleksandr Nogikh wrote: > This is currently causing more than 50% daily crashes on syzbot: > > https://syzkaller.appspot.com/upstream/graph/crashes > > It began to appear after next-20231004. Judging by the diff between > next-20231003 and next-20231004, it looks like quite a few changes to > kernel/sched were merged in between. Could it be caused by any of > those? > > EEVDF scheduling fail, picking leftmost That was in next for a little bit, can you still reproduce with current next?