From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (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 EE66D1925BC; Sat, 20 Dec 2025 12:52:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766235130; cv=none; b=RzZ7tcQirQhtjJ/U+ubgzKfDp5jV60VabGo3icq3DyZcNr7Z/ARKff7WOMBPCnvdRJTSrWbVTaMNeToFbsOXpUVxk6fSsDyCMioTvxoaDP2EJmgTFsJTsJMftXBHAvuTEto+pysTvMcambhJ8V8eP+KeE78WgGdLKauUBPEbkls= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766235130; c=relaxed/simple; bh=tWm20/+cXLus9beoe5QhI8HD8SrpOzk+xo49jrqyxpE=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=nzaMCTagu+yi8LLJZPuM2BB8ZLFYQ3FXqavg3RFak4ppZLEKvt1V5tJaSlz0JOs+3d+hVv8OLh9dkxydX6dQKNE9nmQQWZSm+yKuFY6e8AnOeD2yDGDIc4pinmSPvaT7tnFXvJkY8/AUVg05YgqBRbPzx8NvAI248LW5HR26Fi8= 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=Yn6JYeis; arc=none smtp.client-ip=90.155.50.34 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="Yn6JYeis" 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=y9LRU/tsqzTP+0etrwgZFHv2yi1/U7F5m0QCtyhoT/s=; b=Yn6JYeisKn0+pkzNTy5AHZ3Toc lPOeRvdh1poXR9bpp9BHzbKNZLfHgd3x+TIMPDZ6P8oV306WxU4z/fjLaywO12CgyvYYv3crsUyI4 0sRe120G6Olt2VioeSilqEplwe2i1H1vv7yl4v/HOxVzHgAXmz9Wr79/2zIOrV6y6XYud8DM8qbxL WPc8CpzPDTfGbwVNpHvhT7oGYNCX5rRy0kjvKI1ThScXh8U5TsZO1+tm+MgcmL0HGkZt6iAEj4fur vGCKJELzvIWoqRCNuPe038BnNEC4nOwvT2WyWTRLxKonCYFH47hcpGMu95VTWhFA3R6PK8CcfhV13 q3FtjrBQ==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1vWwRG-00000008y0A-0pkT; Sat, 20 Dec 2025 12:52:02 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id B7B24300578; Sat, 20 Dec 2025 13:52:01 +0100 (CET) Date: Sat, 20 Dec 2025 13:52:01 +0100 From: Peter Zijlstra To: "Paul E. McKenney" Cc: Ingo Molnar , linux-kernel@vger.kernel.org, linux-next@vger.kernel.org, Stephen Rothwell , Mark Brown , kernel-team@meta.com Subject: Re: Shutdown-time hangs in -next in locktorture Message-ID: <20251220125201.GZ3911114@noisy.programming.kicks-ass.net> References: <7f63c3aa-5cf7-47a6-bdd9-d16d9ea65c63@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: <7f63c3aa-5cf7-47a6-bdd9-d16d9ea65c63@paulmck-laptop> On Fri, Dec 19, 2025 at 04:29:26PM -0800, Paul E. McKenney wrote: > Hello, Peter, > > I started hitting shutdown-time hangs in next-20251217 which persist > in next-20251219. This hang happens on both x86 and arm64. Once I > figured out that the failure is high probability, but not deterministic, > bisection converged here: > > 5d1f0b2f278e ("sched/core: Rework sched_class::wakeup_preempt() and rq_modified_*()") That commit no longer exists in tip/sched/core; it was fixed a few days ago, except other problems made -next use an old tip branch which has caused this fix to have delayed visibility :-(