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 3A7BC30C344; Mon, 27 Oct 2025 14:10:04 +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=1761574205; cv=none; b=pjU11+sRVItpVKRBrehRHeNWej9d2LqOM799CG42cuQO5NXnaiRfHr0Yzptg3TuhTG4GblmAPb9MU7ZB65bR3bpSkG63ILVgyHkFBt3TICDOPunn6siKuDB9X5FrNrIWbOamIMrPY3H7qgV1R40/Nar5ydEgupaMN3aEaLSkWdI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761574205; c=relaxed/simple; bh=8M7Xa1NhS2SDFCUirEqng7n+UPA6es2GGJdTWa6yVyA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=tLMK6YRmFW1H5dhl+wxGzq78KNJDykCuSiZ9HaGO0GMHgbUlMOk8R0wIYKQxhmfyYWNG2d5fJpPFY4kaaA6h/BqwWaHbRg/+L4gSuNxe+aMqxHPyp05dgDN30e1wSrO5ITDNbp60jOe7QAReKReMP98/xyN0TcKAcGh62kSUhys= 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=wPj5K8YY; 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="wPj5K8YY" 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=Sl4UP8ZDPXc8plTYm8fO9gCR5Ul7rtGOByjrpyxTfKY=; b=wPj5K8YY0HRrcZ5YNHIXlL5br5 Tk7M8OXB/JHURLpfq2EHLYcsudWXn1/i8zHOIBtNQAPHxnC86JmajtKq6A5w4KCktvrJRc0qNOxpn TL/kl9kt3GDsyX8EbwCmqQ25gd6VJW1+JLDCP+M+zRpWUdwrqdfyUZgcOA89xFCha65wwET0j7Ur3 0XQrBRvQ1hBUnjuFB6mhcFBL4OhxvckZYgw6v1F2CIwop1CMh2+4hlcVVMSXyRmSdyCj8yuaPQyJR OYbQB05Jh75Gg9uBGm3eihVuZM5ve3K2ogJReTBxF00zg2pMgm5mDVRTlRCtZJFs7omxoY5EnnMQD HHYb5+ew==; 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 1vDNv4-00000003GNM-2DZ2; Mon, 27 Oct 2025 14:09:59 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 43357300323; Mon, 27 Oct 2025 15:09:59 +0100 (CET) Date: Mon, 27 Oct 2025 15:09:59 +0100 From: Peter Zijlstra To: "Chen, Yu C" Cc: kernel test robot , Fernand Sieber , oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, x86@kernel.org, aubrey.li@linux.intel.com Subject: Re: [tip:sched/core] [sched/fair] 79104becf4: BUG:kernel_NULL_pointer_dereference,address Message-ID: <20251027140959.GU1386988@noisy.programming.kicks-ass.net> References: <202510211205.1e0f5223-lkp@intel.com> <20251021110449.GO3245006@noisy.programming.kicks-ass.net> <20251027125453.GY4067720@noisy.programming.kicks-ass.net> <3b30e40b-f1fb-4145-b4d9-a9279b9602d8@intel.com> <20251027135516.GA3419281@noisy.programming.kicks-ass.net> <20251027140718.GT1386988@noisy.programming.kicks-ass.net> 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: <20251027140718.GT1386988@noisy.programming.kicks-ass.net> On Mon, Oct 27, 2025 at 03:07:18PM +0100, Peter Zijlstra wrote: > On Mon, Oct 27, 2025 at 02:55:16PM +0100, Peter Zijlstra wrote: > > > > May I know if you are using the kernel config 0day attached? > > > I found that the config 0day attached > > > (https://download.01.org/0day-ci/archive/20251021/202510211205.1e0f5223-lkp@intel.com/config-6.18.0-rc1-00001-g79104becf42b) > > > has > > > CONFIG_IA32_EMULATION=y > > > CONFIG_IA32_EMULATION_DEFAULT_DISABLED=y > > Yep, deleting that entry makes it all work. 'work' might be over stating, it boots and starts trinity, which then promptly (as in a handful of seconds) triggers OOM and dies. Not actually reproducing the NULL deref I was looking for.