From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752660AbbAROS5 (ORCPT ); Sun, 18 Jan 2015 09:18:57 -0500 Received: from aserp1040.oracle.com ([141.146.126.69]:24148 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752121AbbAROSw (ORCPT ); Sun, 18 Jan 2015 09:18:52 -0500 Message-ID: <54BBC084.2030604@oracle.com> Date: Sun, 18 Jan 2015 09:17:40 -0500 From: Sasha Levin User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0 MIME-Version: 1.0 To: "Paul E. McKenney" , Lai Jiangshan CC: Ingo Molnar , Peter Zijlstra , LKML , Dave Jones Subject: rcu, sched: WARNING: CPU: 30 PID: 23771 at kernel/rcu/tree_plugin.h:337 rcu_read_unlock_special+0x369/0x550() Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Source-IP: acsinet22.oracle.com [141.146.126.238] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Paul, Lai, While fuzzing with trinity inside a KVM tools guest running the latest -next kernel, I've stumbled on the following spew: [ 598.188036] WARNING: CPU: 30 PID: 23771 at kernel/rcu/tree_plugin.h:337 rcu_read_unlock_special+0x369/0x550() [ 598.188036] Modules linked in: [ 598.188036] CPU: 30 PID: 23771 Comm: trinity-c118 Not tainted 3.19.0-rc4-next-20150116-sasha-00055-gb8e1507-dirty #1745 [ 598.188036] ffffffff926e52dc ffff8801b4403c38 ffffffff91439fb2 0000000000000000 [ 598.188036] 0000000000000000 ffff8801b4403c78 ffffffff8e159e1a ffff8801b4403c58 [ 598.188036] 0000000000000000 ffff88002f093000 00000000ffffffff ffff8801b23b9290 [ 598.188036] Call Trace: [ 598.188036] dump_stack (lib/dump_stack.c:52) [ 598.212152] warn_slowpath_common (kernel/panic.c:447) [ 598.212152] warn_slowpath_null (kernel/panic.c:481) [ 598.212152] rcu_read_unlock_special (kernel/rcu/tree_plugin.h:337 (discriminator 9)) [ 598.212152] ? select_task_rq_fair (include/linux/rcupdate.h:889 kernel/sched/fair.c:4740) [ 598.212152] __rcu_read_unlock (kernel/rcu/update.c:97) [ 598.212152] select_task_rq_fair (kernel/sched/fair.c:4805) [ 598.212152] ? select_task_rq_fair (include/linux/rcupdate.h:889 kernel/sched/fair.c:4740) [ 598.212152] ? try_to_wake_up (kernel/sched/core.c:1701) [ 598.212152] try_to_wake_up (kernel/sched/core.c:1415 kernel/sched/core.c:1729) [ 598.212152] wake_up_process (kernel/sched/core.c:1797 (discriminator 3)) [ 598.212152] hrtimer_wakeup (kernel/time/hrtimer.c:1490) [ 598.212152] __run_hrtimer (kernel/time/hrtimer.c:1218 (discriminator 3)) [ 598.212152] ? hrtimer_interrupt (kernel/time/hrtimer.c:622 kernel/time/hrtimer.c:1254) [ 598.212152] ? hrtimer_get_res (kernel/time/hrtimer.c:1480) [ 598.212152] hrtimer_interrupt (kernel/time/hrtimer.c:1307) [ 598.212152] local_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:921) [ 598.212152] smp_apic_timer_interrupt (./arch/x86/include/asm/apic.h:660 arch/x86/kernel/apic/apic.c:945) [ 598.212152] apic_timer_interrupt (arch/x86/kernel/entry_64.S:983) [ 598.212152] ? context_tracking_user_enter (./arch/x86/include/asm/paravirt.h:809 kernel/context_tracking.c:106) [ 598.212152] syscall_trace_leave (arch/x86/kernel/ptrace.c:1640) [ 598.212152] int_check_syscall_exit_work (arch/x86/kernel/entry_64.S:577) Thanks, Sasha