Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964852AbaDISZ6 (ORCPT ); Wed, 9 Apr 2014 14:25:58 -0400 Received: from merlin.infradead.org ([205.233.59.134]:51837 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933143AbaDISZ5 (ORCPT ); Wed, 9 Apr 2014 14:25:57 -0400 Date: Wed, 9 Apr 2014 20:25:53 +0200 From: Peter Zijlstra To: Lin Ming Cc: "linux-arm-kernel@lists.infradead.org" , lkml Subject: Re: current->sched_class->yield_task is NULL, any hint? Message-ID: <20140409182553.GE10526@twins.programming.kicks-ass.net> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Apr 09, 2014 at 10:43:32AM -0700, Lin Ming wrote: > Hi Peter, > > I hit a panic in sys_sched_yield() because(for some unknown reason) > current->sched_class->yield_task is NULL. > It's an ARM embedded board with 3.4-rt kernel. > > Could you share any hint for the possible causes? What class does current->sched_class point to? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/