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 7483130F53E; Wed, 5 Nov 2025 11:03:27 +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=1762340609; cv=none; b=s2/QfAWUx1EcP85sW6E/JwSyEu9V1teKrzeyW/aGtqldvNpdAfVxr7XqUALNSOrbEnNyZsRuCSYDO4dk6iUQ13HVMssZNaSpJtJkO2egzHjYaiq1N2xFJEm1UH0mfYOAPSgltRvGEmHMZfYN8oARAkK4XOAUiUw6zoHQ/jnfg2k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762340609; c=relaxed/simple; bh=tAd9oj4GERMTGuDoDW0cfUawpZHiAQD5J0YJbAcPuN4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=WvtiTQvth/AFlGbGkDLs294h4kmi1n6oJQhnQolg+X3MrpH045u15jyFOl8ger1fAixYfcVpp64AfNyWubI+u2Uww57b0h3POyTfRB23GQZjSVEIsG2WVT73AsnXY6F/qz4xzjpuyLJD8WUEMn6krNZzuOUzphqvMOE6KW7Qf1s= 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=op+lubN6; 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="op+lubN6" 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=aP4cCfAyhuWBajIhwXSDkRwzA8AewSKAd6qPPvdJB5o=; b=op+lubN6NntcrOA0lxB0gorqPg no9/ehK2prb3lQ4fms5AIeCiW0W/48Re/qKwn+CZEyTMJs9u1SU72Tgryy7O7niovykam5uDfSaG9 5uCY4m5GcbLNaB3PdlinN+iU20OV/szPYubop5Du1yac71dNzlGAhpHQlZWF6MDZ5RAFc8/mUfCS/ IrwhyqxFaIuvthRblzp+iEMq+6v+B5vEO56KGmIk2WxkzdM6Mz0ewO5NTld5SP0RU9Sxua4vSubJw NFNZqbmkJPKZcEZKApyyOrCvKoBX5W8UsMsZWFixBS0UEeiqupvecFI332F7Rb4Hn7ffxCwkpQrTO TwFN7R1Q==; 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 1vGbIQ-00000003lyh-2Frv; Wed, 05 Nov 2025 11:03:23 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 502F4300230; Wed, 05 Nov 2025 12:03:23 +0100 (CET) Date: Wed, 5 Nov 2025 12:03:23 +0100 From: Peter Zijlstra To: Fernand Sieber Cc: kernel test robot , oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, x86@kernel.org, aubrey.li@linux.intel.com, yu.c.chen@intel.com Subject: Re: [tip:sched/core] [sched/fair] 79104becf4: BUG:kernel_NULL_pointer_dereference,address Message-ID: <20251105110323.GJ988547@noisy.programming.kicks-ass.net> References: <202510211205.1e0f5223-lkp@intel.com> <20251104210456.652800-1-sieberf@amazon.com> Precedence: bulk X-Mailing-List: oe-lkp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251104210456.652800-1-sieberf@amazon.com> On Tue, Nov 04, 2025 at 11:04:55PM +0200, Fernand Sieber wrote: > Hi Peter, > > I spent some time today investigating this report. The crash happens when > a proxy task yields. > Ooh, nice!