Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751849AbaGFR2O (ORCPT ); Sun, 6 Jul 2014 13:28:14 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:51820 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751653AbaGFR2N (ORCPT ); Sun, 6 Jul 2014 13:28:13 -0400 Message-ID: <53B98709.3090603@oracle.com> Date: Sun, 06 Jul 2014 13:27:37 -0400 From: Sasha Levin User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: Peter Zijlstra , Ingo Molnar CC: LKML , Dave Jones Subject: sched: spinlock recursion in sched_rr_get_interval X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Source-IP: acsinet21.oracle.com [141.146.126.237] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all, While fuzzing with trinity inside a KVM tools guest running the latest -next kernel I've stumbled on the following spew: [10062.200152] BUG: spinlock recursion on CPU#11, trinity-c194/2414 [10062.201897] lock: 0xffff88010cfd7740, .magic: dead4ead, .owner: trinity-c194/2414, .owner_cpu: -1 [10062.204432] CPU: 11 PID: 2414 Comm: trinity-c194 Not tainted 3.16.0-rc3-next-20140703-sasha-00024-g2ad7668-dirty #763 [10062.207517] ffff88010cfd7740 ffff8803a429fe48 ffffffffaa4897e4 0000000000000000 [10062.209810] ffff8803c35f0000 ffff8803a429fe68 ffffffffaa47df58 ffff88010cfd7740 [10062.210024] ffffffffab845c77 ffff8803a429fe88 ffffffffaa47df83 ffff88010cfd7740 [10062.210024] Call Trace: [10062.210024] dump_stack (lib/dump_stack.c:52) [10062.210024] spin_dump (kernel/locking/spinlock_debug.c:68 (discriminator 6)) [10062.210024] spin_bug (kernel/locking/spinlock_debug.c:76) [10062.210024] do_raw_spin_lock (kernel/locking/spinlock_debug.c:84 kernel/locking/spinlock_debug.c:135) [10062.210024] _raw_spin_lock (include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:151) [10062.210024] ? task_rq_lock (include/linux/sched.h:2885 kernel/sched/core.c:348) [10062.210024] task_rq_lock (include/linux/sched.h:2885 kernel/sched/core.c:348) [10062.210024] SyS_sched_rr_get_interval (kernel/sched/core.c:4429 kernel/sched/core.c:4407) [10062.210024] ? tracesys (arch/x86/kernel/entry_64.S:531) [10062.210024] tracesys (arch/x86/kernel/entry_64.S:542) Thanks, Sasha -- 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/