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Date: Tue, 24 Jan 2012 08:53:13 -0800
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To: Eric Dumazet <eric.dumazet@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>,
Linus Torvalds <torvalds@...ux-foundation.org>,
linux-kernel@...r.kernel.org,
Frédéric Weisbecker <fweisbec@...il.com>,
Thomas Gleixner <tglx@...utronix.de>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] RCU changes for v3.3
On Tue, Jan 24, 2012 at 05:25:12PM +0100, Eric Dumazet wrote:
> 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 :
Hmmm... Looks like tracing from within the inner idle loop.
Because RCU ignores CPUs in the inner idle loop (after the call to
rcu_idle_enter()), RCU read-side critical sections are not legal there.
One approach would be to delay the call to rcu_idle_enter() until after
the tracing is done, and to ensure that the call to rcu_idle_exit() happens
before any tracing. I am not seeing perf_trace_power(), so need to
update and look again. Or are you looking at -next rather than mainline?
Thanx, Paul
> [ 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] [<ffffffff81094a2a>] lockdep_rcu_suspicious+0xca/0xf0
> [ 850.464588] [<ffffffff8100abb9>] mwait_idle+0x499/0x4c0
> [ 850.464592] [<ffffffff810011e6>] cpu_idle+0x96/0xe0
> [ 850.464597] [<ffffffff8176bbae>] 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] [<ffffffff81038f1f>] warn_slowpath_common+0x7f/0xc0
> [ 850.464791] [<ffffffff81038f7a>] warn_slowpath_null+0x1a/0x20
> [ 850.464794] [<ffffffff810f8f2c>] __perf_event_overflow+0x27c/0x2c0
> [ 850.464797] [<ffffffff8177126e>] ? printk+0x41/0x43
> [ 850.464801] [<ffffffff810a1ff6>] ? __module_text_address+0x16/0x80
> [ 850.464804] [<ffffffff810f9019>] perf_swevent_overflow+0xa9/0xc0
> [ 850.464806] [<ffffffff810f909f>] perf_swevent_event+0x6f/0x90
> [ 850.464809] [<ffffffff810f9136>] perf_tp_event+0x76/0xf0
> [ 850.464813] [<ffffffff810f153e>] perf_trace_power+0xbe/0xe0
> [ 850.464816] [<ffffffff8100ab2f>] ? mwait_idle+0x40f/0x4c0
> [ 850.464818] [<ffffffff8100ab2f>] mwait_idle+0x40f/0x4c0
> [ 850.464821] [<ffffffff810011e6>] cpu_idle+0x96/0xe0
> [ 850.464824] [<ffffffff8176bbae>] 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] [<ffffffff81038f1f>] warn_slowpath_common+0x7f/0xc0
> [ 850.464849] [<ffffffff81038f7a>] warn_slowpath_null+0x1a/0x20
> [ 850.464852] [<ffffffff810fc2f6>] perf_output_begin+0x2f6/0x330
> [ 850.464855] [<ffffffff810769e5>] ? sched_clock_cpu+0xc5/0x120
> [ 850.464858] [<ffffffff8109378d>] ? trace_hardirqs_off+0xd/0x10
> [ 850.464860] [<ffffffff81076a8f>] ? local_clock+0x4f/0x60
> [ 850.464863] [<ffffffff810f223d>] ? __perf_event_header__init_id+0xad/0xf0
> [ 850.464866] [<ffffffff810f8c03>] ? perf_prepare_sample+0x63/0x110
> [ 850.464869] [<ffffffff810f8e3d>] __perf_event_overflow+0x18d/0x2c0
> [ 850.464871] [<ffffffff810f8df5>] ? __perf_event_overflow+0x145/0x2c0
> [ 850.464874] [<ffffffff8177126e>] ? printk+0x41/0x43
> [ 850.464876] [<ffffffff810f9019>] perf_swevent_overflow+0xa9/0xc0
> [ 850.464879] [<ffffffff810f909f>] perf_swevent_event+0x6f/0x90
> [ 850.464881] [<ffffffff810f9136>] perf_tp_event+0x76/0xf0
> [ 850.464884] [<ffffffff810f153e>] perf_trace_power+0xbe/0xe0
> [ 850.464887] [<ffffffff8100ab2f>] ? mwait_idle+0x40f/0x4c0
> [ 850.464890] [<ffffffff8100ab2f>] mwait_idle+0x40f/0x4c0
> [ 850.464893] [<ffffffff810011e6>] cpu_idle+0x96/0xe0
> [ 850.464895] [<ffffffff8176bbae>] 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: [<ffffffff810f8df5>] __perf_event_overflow+0x145/0x2c0
> [ 850.464920] #1: (rcu_read_lock){.+.+..}, at: [<ffffffff810fc03f>] 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] [<ffffffff81094a2a>] lockdep_rcu_suspicious+0xca/0xf0
> [ 850.464933] [<ffffffff810fc268>] perf_output_begin+0x268/0x330
> [ 850.464936] [<ffffffff810fc03f>] ? perf_output_begin+0x3f/0x330
> [ 850.464938] [<ffffffff810769e5>] ? sched_clock_cpu+0xc5/0x120
> [ 850.464941] [<ffffffff8109378d>] ? trace_hardirqs_off+0xd/0x10
> [ 850.464943] [<ffffffff81076a8f>] ? local_clock+0x4f/0x60
> [ 850.464946] [<ffffffff810f223d>] ? __perf_event_header__init_id+0xad/0xf0
> [ 850.464949] [<ffffffff810f8c03>] ? perf_prepare_sample+0x63/0x110
> [ 850.464952] [<ffffffff810f8e3d>] __perf_event_overflow+0x18d/0x2c0
> [ 850.464954] [<ffffffff810f8df5>] ? __perf_event_overflow+0x145/0x2c0
> [ 850.464957] [<ffffffff8177126e>] ? printk+0x41/0x43
> [ 850.464959] [<ffffffff810f9019>] perf_swevent_overflow+0xa9/0xc0
> [ 850.464962] [<ffffffff810f909f>] perf_swevent_event+0x6f/0x90
> [ 850.464964] [<ffffffff810f9136>] perf_tp_event+0x76/0xf0
> [ 850.464967] [<ffffffff810f153e>] perf_trace_power+0xbe/0xe0
> [ 850.464970] [<ffffffff8100ab2f>] ? mwait_idle+0x40f/0x4c0
> [ 850.464973] [<ffffffff8100ab2f>] mwait_idle+0x40f/0x4c0
> [ 850.464975] [<ffffffff810011e6>] cpu_idle+0x96/0xe0
> [ 850.464978] [<ffffffff8176bbae>] 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] [<ffffffff81038f1f>] warn_slowpath_common+0x7f/0xc0
> [ 850.465001] [<ffffffff81038f7a>] warn_slowpath_null+0x1a/0x20
> [ 850.465003] [<ffffffff810fc38b>] perf_output_end+0x5b/0x70
> [ 850.465006] [<ffffffff810f8edc>] __perf_event_overflow+0x22c/0x2c0
> [ 850.465008] [<ffffffff810f8df5>] ? __perf_event_overflow+0x145/0x2c0
> [ 850.465011] [<ffffffff810f9019>] perf_swevent_overflow+0xa9/0xc0
> [ 850.465014] [<ffffffff810f909f>] perf_swevent_event+0x6f/0x90
> [ 850.465016] [<ffffffff810f9136>] perf_tp_event+0x76/0xf0
> [ 850.465019] [<ffffffff810f153e>] perf_trace_power+0xbe/0xe0
> [ 850.465022] [<ffffffff8100ab2f>] ? mwait_idle+0x40f/0x4c0
> [ 850.465025] [<ffffffff8100ab2f>] mwait_idle+0x40f/0x4c0
> [ 850.465027] [<ffffffff810011e6>] cpu_idle+0x96/0xe0
> [ 850.465030] [<ffffffff8176bbae>] 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] [<ffffffff81038f1f>] warn_slowpath_common+0x7f/0xc0
> [ 850.465054] [<ffffffff81038f7a>] warn_slowpath_null+0x1a/0x20
> [ 850.465056] [<ffffffff810f8f56>] __perf_event_overflow+0x2a6/0x2c0
> [ 850.465059] [<ffffffff810f8df5>] ? __perf_event_overflow+0x145/0x2c0
> [ 850.465061] [<ffffffff810f9019>] perf_swevent_overflow+0xa9/0xc0
> [ 850.465064] [<ffffffff810f909f>] perf_swevent_event+0x6f/0x90
> [ 850.465066] [<ffffffff810f9136>] perf_tp_event+0x76/0xf0
> [ 850.465069] [<ffffffff810f153e>] perf_trace_power+0xbe/0xe0
> [ 850.465072] [<ffffffff8100ab2f>] ? mwait_idle+0x40f/0x4c0
> [ 850.465075] [<ffffffff8100ab2f>] mwait_idle+0x40f/0x4c0
> [ 850.465077] [<ffffffff810011e6>] cpu_idle+0x96/0xe0
> [ 850.465080] [<ffffffff8176bbae>] 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] [<ffffffff81094a2a>] lockdep_rcu_suspicious+0xca/0xf0
> [ 850.467650] [<ffffffff8100a9cd>] mwait_idle+0x2ad/0x4c0
> [ 850.467653] [<ffffffff810011e6>] cpu_idle+0x96/0xe0
> [ 850.467656] [<ffffffff8176bbae>] start_secondary+0x1df/0x1e3
>
>
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