From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E6C642C0276; Tue, 16 Dec 2025 12:21:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765887699; cv=none; b=VKpa6oIc8RStXe3ztoaLrIFpoLxkGYaobgMbw+MB7j5wUU32Zj6d34wR37BPkhK1uNJHyEvEOr1Zu+VcyqZ1aKSxI2i+hheSqx0iQlRi0SeVwPRUacNKDPQ5enfSliUDhRHJQFZkzHwIRHj9T2v6IRZ+8rVhuU4Oq8WKM9yBtOU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765887699; c=relaxed/simple; bh=C4ZCtGaorY2iNcS2xCMFxHm2sey0F2S4YUTWK0bJQwI=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=dT0YClI2EzRFJ+Shp8OfSftIAoemcfGAnl0/0jaSlKW5OyRRtC5nnL+YHk1Zi5wYTvIyhmg/46jfAUsK+A3RAIxSw/yg2bPNpj298GcNyOkw32qhvhW51QjMEAZRqWYLuXbIVRc1Ew2yCNpzGH2k/rCPGw25Evp1XFXUoa7kGF0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=hmxnV4TY; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="hmxnV4TY" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; 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=luuWbl2V6fjTWQjqgSt8uiagh+rMcmA/i0xVdu1b7MI=; b=hmxnV4TY5JqOsp5efqDwifnZqh CqdWFyb6ZmC/3gAdrumkzPzjg+PBci6vcqq0w7sPTcqOaOsotRg5Ya68pu9TGJAaZjx+PjQrRLJ7Y 2+wQrAEQZNvos8ZdpMpL8MkuVI/lTouV4l3GejRz9h6w+QRzw8XG27Z0w55Y+1bcSULNhgEmk3MfR KYTnnhtaUd9urfrN0qS618qW1Sadc0a3lc7cIqOG0t2vNfA5PdsI3eewFa7jSJsPXxJz6MfSJGlQZ 6z7fNksV4Ui4Z8eCz6CjQSeDcuB8Dpsn0D3CuyHj/NDPPEDPxVn0WcQTm6SzZCynho+Rfpq8Q3nZO aVXwwweQ==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1vVTC1-00000004haW-0DlY; Tue, 16 Dec 2025 11:26:13 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 20050300220; Tue, 16 Dec 2025 13:21:27 +0100 (CET) Date: Tue, 16 Dec 2025 13:21:27 +0100 From: Peter Zijlstra To: Naresh Kamboju Cc: sched-ext@lists.linux.dev, open list , lkft-triage@lists.linaro.org, Ingo Molnar , Vincent Guittot , Juri Lelli , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Tejun Heo , void@manifault.com, arighi@nvidia.com, changwoo@igalia.com Subject: Re: Boot regression: arm64: WARNING: kernel/sched/core.c:10851 at sched_change_end Message-ID: <20251216122127.GC3707891@noisy.programming.kicks-ass.net> References: 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 Tue, Dec 16, 2025 at 05:09:52PM +0530, Naresh Kamboju wrote: > The following boot warning is noticed on qemu-arm64 devices booting > Linux next-20251215 on wards. > > Regression Analysis: > - New regression? yes > - Reproducibility? yes > > First seen on next-20251215 > Bad: next-20251215 and next-20251216 > Good: next-20251212 > > Boot regression: arm64: WARNING: kernel/sched/core.c:10851 at sched_change_end > > Reported-by: Linux Kernel Functional Testing This is absolutely unreadable due to all the wrapping.