Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934301AbaDIScZ (ORCPT ); Wed, 9 Apr 2014 14:32:25 -0400 Received: from mail-lb0-f182.google.com ([209.85.217.182]:51304 "EHLO mail-lb0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933736AbaDIScV (ORCPT ); Wed, 9 Apr 2014 14:32:21 -0400 MIME-Version: 1.0 In-Reply-To: <20140409182553.GE10526@twins.programming.kicks-ass.net> References: <20140409182553.GE10526@twins.programming.kicks-ass.net> Date: Wed, 9 Apr 2014 11:32:20 -0700 Message-ID: Subject: Re: current->sched_class->yield_task is NULL, any hint? From: Lin Ming To: Peter Zijlstra Cc: "linux-arm-kernel@lists.infradead.org" , lkml Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Apr 9, 2014 at 11:25 AM, Peter Zijlstra wrote: > 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? [12890.088232] Process swapper/0 (pid: 0, stack limit = 0xc07042f0) It's idle task. I think it should be idle_sched_class. But let me double check it. Thanks. -- 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/