From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8E80BC369A1 for ; Tue, 8 Apr 2025 09:51:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To: Content-Transfer-Encoding:Content-Type:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=epFMM6E3b5n0AAjQqhCMwFutqLu+axl/bDlyBr62jpM=; b=AXBk5n624I0XWnYVHCFBF1meFj 2zW3V0YKvcZOcJnOZbjD9DMrYgDPEVJruwdyan3t67dntjEe6617X+3CUWfaL6wt5QlVyYujpm6mP 13YE4+wFbXlMrC9kkne/hLycEo/ekrJD7yNDTnB7WCjjeOprbvSIOdDMGFoFt7a+aWSff3ChIeWgR bHGtggxxncnUM7QZp1gHB+CcRJSjn4pH3QZnOd9nKmDbtnl7zkjmxvEjoJYtgooGMtkS4kfyKEqda 4zslcHk8iWQgsc6WvtO2cQz2H2lr9IrxQkl1k6KQlQEfTkGVshTGoTLmzpmBSEGdO+aZ+g2m0Ewpr 0S3gvV6w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.1 #2 (Red Hat Linux)) id 1u25bj-00000003Vmo-1Rep; Tue, 08 Apr 2025 09:51:03 +0000 Received: from mail11.truemail.it ([2001:4b7e:0:8::81]) by bombadil.infradead.org with esmtps (Exim 4.98.1 #2 (Red Hat Linux)) id 1u25Mn-00000003T5R-3Wdu for linux-arm-kernel@lists.infradead.org; Tue, 08 Apr 2025 09:35:39 +0000 Received: from gaggiata.pivistrello.it (93-49-2-63.ip317.fastwebnet.it [93.49.2.63]) by mail11.truemail.it (Postfix) with ESMTPA id 7B98F1F9BC; Tue, 8 Apr 2025 11:35:35 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dolcini.it; s=default; t=1744104935; bh=epFMM6E3b5n0AAjQqhCMwFutqLu+axl/bDlyBr62jpM=; h=Received:From:To:Subject; b=kRPeka47FL9mUb/LiDd/KpngGvLjxHugS25K7j24KcMayZUKVJPhJdJic4fXTaRVi fPOKGwxQ9qqLyl/6RhA+Mkw+mSUUotd/VLHTPRETb8/UwuMohmuRXW2/8U1bs6f4VH Oi86j2bfeCOn5i5AOeFvnjiAxLLKcY1NZFy8sbaYmOVOVxEuQogIE6orN3NX/x1J8h YqBnKXKQ9DHpF+MV9LJeyRylGN9US8ePAGtJBC4+Ph1R1G+T1m6qPROnW/SZtOPqNl HOkkaWNeoZ7K7vLm7xW/IvqQLofWQOA+ODX83FJvJAcIHsqOYm8yU5rO7K+M2NBmFz tJS0d65nIZHLw== Received: by gaggiata.pivistrello.it (Postfix, from userid 1000) id 328987F8D5; Tue, 8 Apr 2025 11:35:35 +0200 (CEST) Date: Tue, 8 Apr 2025 11:35:35 +0200 From: Francesco Dolcini To: Paul Menzel Cc: Francesco Dolcini , Amitkumar Karwar , Neeraj Kale , Nishanth Menon , Tero Kristo , Santosh Shilimkar , linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org, linux-serial@vger.kernel.org, regressions@lists.linux.dev Subject: Re: Kernel WARNING (RCU) with btnxpuart on TI AM62 platform Message-ID: References: <20250408083512.GA26035@francesco-nb> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250408_023538_035064_F0572CB5 X-CRM114-Status: GOOD ( 15.89 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hello, On Tue, Apr 08, 2025 at 11:26:47AM +0200, Paul Menzel wrote: > [Cc: +regressions@] > > #regzbot introduced: v6.14..v6.15-rc1 > > > Thank you for your report. > > Am 08.04.25 um 10:35 schrieb Francesco Dolcini: > > > I do have the following kernel warning with 6.15-rc1, on a TI AM62 > > platform (arm64), single CPU core, using btnxpuart driver, any idea? > > PREEMPT_RT is enabled, if it matters. > > > > Either the issue is not systematic, or multi cores SoCs are not affected > > (no error on the exact same image on a dual nor on quad core TI AM62). > > > > > > [ 23.139080] Voluntary context switch within RCU read-side critical section! > > [ 23.139119] WARNING: CPU: 0 PID: 61 at /kernel/rcu/tree_plugin.h:332 rcu_note_context_switch+0x3c4/0x430 ... > As I understood, that it’s a regression, and you can reproduce it, would it > be possible, that you bisected the issue? I am not sure if this is a regression. It's possible that the issue is not new, and it is just non systematic. For sure it was reproduced by our CI on v6.15-rc1. Francesco