From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755280Ab2AXQZS (ORCPT ); Tue, 24 Jan 2012 11:25:18 -0500 Received: from mail-ww0-f44.google.com ([74.125.82.44]:58743 "EHLO mail-ww0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752096Ab2AXQZQ (ORCPT ); Tue, 24 Jan 2012 11:25:16 -0500 Message-ID: <1327422312.7231.22.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC> Subject: Re: [GIT PULL] RCU changes for v3.3 From: Eric Dumazet To: Ingo Molnar Cc: Linus Torvalds , linux-kernel@vger.kernel.org, "Paul E. McKenney" , =?ISO-8859-1?Q?Fr=E9d=E9ric?= Weisbecker , Thomas Gleixner , Peter Zijlstra , Andrew Morton Date: Tue, 24 Jan 2012 17:25:12 +0100 In-Reply-To: <20120105135432.GA31450@elte.hu> References: <20120105135432.GA31450@elte.hu> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.1- Content-Transfer-Encoding: 8bit Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Le jeudi 05 janvier 2012 à 14:54 +0100, Ingo Molnar a écrit : > Linus, > > Please pull the latest core-rcu-for-linus git tree from: > > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core-rcu-for-linus > > Thanks, > Hi guys New lockdep warning here : [ 850.464548] [ 850.464550] =============================== [ 850.464553] [ INFO: suspicious RCU usage. ] [ 850.464555] 3.3.0-rc1+ #569 Not tainted [ 850.464557] ------------------------------- [ 850.464559] include/trace/events/power.h:102 suspicious rcu_dereference_check() usage! [ 850.464562] [ 850.464562] other info that might help us debug this: [ 850.464564] [ 850.464566] [ 850.464567] rcu_scheduler_active = 1, debug_locks = 1 [ 850.464569] RCU used illegally from extended quiescent state! [ 850.464571] no locks held by swapper/1/0. [ 850.464572] [ 850.464572] stack backtrace: [ 850.464575] Pid: 0, comm: swapper/1 Not tainted 3.3.0-rc1+ #569 [ 850.464578] Call Trace: [ 850.464584] [] lockdep_rcu_suspicious+0xca/0xf0 [ 850.464588] [] mwait_idle+0x499/0x4c0 [ 850.464592] [] cpu_idle+0x96/0xe0 [ 850.464597] [] start_secondary+0x1df/0x1e3 [ 850.464765] ------------[ cut here ]------------ [ 850.464769] WARNING: at include/linux/rcupdate.h:242 __perf_event_overflow+0x27c/0x2c0() [ 850.464771] Hardware name: ProLiant BL460c G6 [ 850.464772] Modules linked in: ipmi_devintf nfsd exportfs ipmi_si hpilo bnx2x crc32c libcrc32c mdio [last unloaded: scsi_wait_scan] [ 850.464783] Pid: 0, comm: swapper/1 Not tainted 3.3.0-rc1+ #569 [ 850.464784] Call Trace: [ 850.464788] [] warn_slowpath_common+0x7f/0xc0 [ 850.464791] [] warn_slowpath_null+0x1a/0x20 [ 850.464794] [] __perf_event_overflow+0x27c/0x2c0 [ 850.464797] [] ? printk+0x41/0x43 [ 850.464801] [] ? __module_text_address+0x16/0x80 [ 850.464804] [] perf_swevent_overflow+0xa9/0xc0 [ 850.464806] [] perf_swevent_event+0x6f/0x90 [ 850.464809] [] perf_tp_event+0x76/0xf0 [ 850.464813] [] perf_trace_power+0xbe/0xe0 [ 850.464816] [] ? mwait_idle+0x40f/0x4c0 [ 850.464818] [] mwait_idle+0x40f/0x4c0 [ 850.464821] [] cpu_idle+0x96/0xe0 [ 850.464824] [] start_secondary+0x1df/0x1e3 [ 850.464826] ---[ end trace d3b6df8c2cde8681 ]--- [ 850.464828] ------------[ cut here ]------------ [ 850.464831] WARNING: at include/linux/rcupdate.h:242 perf_output_begin+0x2f6/0x330() [ 850.464832] Hardware name: ProLiant BL460c G6 [ 850.464833] Modules linked in: ipmi_devintf nfsd exportfs ipmi_si hpilo bnx2x crc32c libcrc32c mdio [last unloaded: scsi_wait_scan] [ 850.464842] Pid: 0, comm: swapper/1 Tainted: G W 3.3.0-rc1+ #569 [ 850.464844] Call Trace: [ 850.464846] [] warn_slowpath_common+0x7f/0xc0 [ 850.464849] [] warn_slowpath_null+0x1a/0x20 [ 850.464852] [] perf_output_begin+0x2f6/0x330 [ 850.464855] [] ? sched_clock_cpu+0xc5/0x120 [ 850.464858] [] ? trace_hardirqs_off+0xd/0x10 [ 850.464860] [] ? local_clock+0x4f/0x60 [ 850.464863] [] ? __perf_event_header__init_id+0xad/0xf0 [ 850.464866] [] ? perf_prepare_sample+0x63/0x110 [ 850.464869] [] __perf_event_overflow+0x18d/0x2c0 [ 850.464871] [] ? __perf_event_overflow+0x145/0x2c0 [ 850.464874] [] ? printk+0x41/0x43 [ 850.464876] [] perf_swevent_overflow+0xa9/0xc0 [ 850.464879] [] perf_swevent_event+0x6f/0x90 [ 850.464881] [] perf_tp_event+0x76/0xf0 [ 850.464884] [] perf_trace_power+0xbe/0xe0 [ 850.464887] [] ? mwait_idle+0x40f/0x4c0 [ 850.464890] [] mwait_idle+0x40f/0x4c0 [ 850.464893] [] cpu_idle+0x96/0xe0 [ 850.464895] [] start_secondary+0x1df/0x1e3 [ 850.464897] ---[ end trace d3b6df8c2cde8682 ]--- [ 850.464899] [ 850.464900] =============================== [ 850.464901] [ INFO: suspicious RCU usage. ] [ 850.464902] 3.3.0-rc1+ #569 Tainted: G W [ 850.464904] ------------------------------- [ 850.464905] kernel/events/ring_buffer.c:120 suspicious rcu_dereference_check() usage! [ 850.464907] [ 850.464907] other info that might help us debug this: [ 850.464908] [ 850.464909] [ 850.464910] rcu_scheduler_active = 1, debug_locks = 1 [ 850.464911] RCU used illegally from extended quiescent state! [ 850.464913] 2 locks held by swapper/1/0: [ 850.464914] #0: (rcu_read_lock){.+.+..}, at: [] __perf_event_overflow+0x145/0x2c0 [ 850.464920] #1: (rcu_read_lock){.+.+..}, at: [] perf_output_begin+0x3f/0x330 [ 850.464924] [ 850.464925] stack backtrace: [ 850.464927] Pid: 0, comm: swapper/1 Tainted: G W 3.3.0-rc1+ #569 [ 850.464928] Call Trace: [ 850.464931] [] lockdep_rcu_suspicious+0xca/0xf0 [ 850.464933] [] perf_output_begin+0x268/0x330 [ 850.464936] [] ? perf_output_begin+0x3f/0x330 [ 850.464938] [] ? sched_clock_cpu+0xc5/0x120 [ 850.464941] [] ? trace_hardirqs_off+0xd/0x10 [ 850.464943] [] ? local_clock+0x4f/0x60 [ 850.464946] [] ? __perf_event_header__init_id+0xad/0xf0 [ 850.464949] [] ? perf_prepare_sample+0x63/0x110 [ 850.464952] [] __perf_event_overflow+0x18d/0x2c0 [ 850.464954] [] ? __perf_event_overflow+0x145/0x2c0 [ 850.464957] [] ? printk+0x41/0x43 [ 850.464959] [] perf_swevent_overflow+0xa9/0xc0 [ 850.464962] [] perf_swevent_event+0x6f/0x90 [ 850.464964] [] perf_tp_event+0x76/0xf0 [ 850.464967] [] perf_trace_power+0xbe/0xe0 [ 850.464970] [] ? mwait_idle+0x40f/0x4c0 [ 850.464973] [] mwait_idle+0x40f/0x4c0 [ 850.464975] [] cpu_idle+0x96/0xe0 [ 850.464978] [] start_secondary+0x1df/0x1e3 [ 850.464980] ------------[ cut here ]------------ [ 850.464983] WARNING: at include/linux/rcupdate.h:248 perf_output_end+0x5b/0x70() [ 850.464984] Hardware name: ProLiant BL460c G6 [ 850.464985] Modules linked in: ipmi_devintf nfsd exportfs ipmi_si hpilo bnx2x crc32c libcrc32c mdio [last unloaded: scsi_wait_scan] [ 850.464994] Pid: 0, comm: swapper/1 Tainted: G W 3.3.0-rc1+ #569 [ 850.464995] Call Trace: [ 850.464998] [] warn_slowpath_common+0x7f/0xc0 [ 850.465001] [] warn_slowpath_null+0x1a/0x20 [ 850.465003] [] perf_output_end+0x5b/0x70 [ 850.465006] [] __perf_event_overflow+0x22c/0x2c0 [ 850.465008] [] ? __perf_event_overflow+0x145/0x2c0 [ 850.465011] [] perf_swevent_overflow+0xa9/0xc0 [ 850.465014] [] perf_swevent_event+0x6f/0x90 [ 850.465016] [] perf_tp_event+0x76/0xf0 [ 850.465019] [] perf_trace_power+0xbe/0xe0 [ 850.465022] [] ? mwait_idle+0x40f/0x4c0 [ 850.465025] [] mwait_idle+0x40f/0x4c0 [ 850.465027] [] cpu_idle+0x96/0xe0 [ 850.465030] [] start_secondary+0x1df/0x1e3 [ 850.465032] ---[ end trace d3b6df8c2cde8683 ]--- [ 850.465033] ------------[ cut here ]------------ [ 850.465036] WARNING: at include/linux/rcupdate.h:248 __perf_event_overflow+0x2a6/0x2c0() [ 850.465037] Hardware name: ProLiant BL460c G6 [ 850.465038] Modules linked in: ipmi_devintf nfsd exportfs ipmi_si hpilo bnx2x crc32c libcrc32c mdio [last unloaded: scsi_wait_scan] [ 850.465047] Pid: 0, comm: swapper/1 Tainted: G W 3.3.0-rc1+ #569 [ 850.465048] Call Trace: [ 850.465051] [] warn_slowpath_common+0x7f/0xc0 [ 850.465054] [] warn_slowpath_null+0x1a/0x20 [ 850.465056] [] __perf_event_overflow+0x2a6/0x2c0 [ 850.465059] [] ? __perf_event_overflow+0x145/0x2c0 [ 850.465061] [] perf_swevent_overflow+0xa9/0xc0 [ 850.465064] [] perf_swevent_event+0x6f/0x90 [ 850.465066] [] perf_tp_event+0x76/0xf0 [ 850.465069] [] perf_trace_power+0xbe/0xe0 [ 850.465072] [] ? mwait_idle+0x40f/0x4c0 [ 850.465075] [] mwait_idle+0x40f/0x4c0 [ 850.465077] [] cpu_idle+0x96/0xe0 [ 850.465080] [] start_secondary+0x1df/0x1e3 [ 850.465082] ---[ end trace d3b6df8c2cde8684 ]--- [ 850.467615] [ 850.467617] =============================== [ 850.467619] [ INFO: suspicious RCU usage. ] [ 850.467621] 3.3.0-rc1+ #569 Tainted: G W [ 850.467624] ------------------------------- [ 850.467626] include/trace/events/power.h:127 suspicious rcu_dereference_check() usage! [ 850.467629] [ 850.467629] other info that might help us debug this: [ 850.467630] [ 850.467632] [ 850.467632] rcu_scheduler_active = 1, debug_locks = 1 [ 850.467634] RCU used illegally from extended quiescent state! [ 850.467636] no locks held by swapper/1/0. [ 850.467637] [ 850.467638] stack backtrace: [ 850.467640] Pid: 0, comm: swapper/1 Tainted: G W 3.3.0-rc1+ #569 [ 850.467642] Call Trace: [ 850.467646] [] lockdep_rcu_suspicious+0xca/0xf0 [ 850.467650] [] mwait_idle+0x2ad/0x4c0 [ 850.467653] [] cpu_idle+0x96/0xe0 [ 850.467656] [] start_secondary+0x1df/0x1e3