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Date:	Tue, 21 May 2013 10:37:24 +0800
From:	Michael Wang <wangyun@...ux.vnet.ibm.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	Viresh Kumar <viresh.kumar@...aro.org>, Tejun Heo <tj@...nel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org,
	x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>, rjw@...k.pl,
	cpufreq@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: NOHZ: WARNING: at arch/x86/kernel/smp.c:123 native_smp_send_reschedule,
 round 2

On 05/21/2013 10:20 AM, Michael Wang wrote:
[snip]
> 
> If hotplug could not happen but still get an offline cpu from
> policy->cpus, than we could say it's wrong, otherwise we proved nothing...

like this:

diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c
index 443442d..8ed8b35 100644
--- a/drivers/cpufreq/cpufreq_governor.c
+++ b/drivers/cpufreq/cpufreq_governor.c
@@ -26,6 +26,7 @@
 #include <linux/tick.h>
 #include <linux/types.h>
 #include <linux/workqueue.h>
+#include <linux/cpu.h>
 
 #include "cpufreq_governor.h"
 
@@ -169,6 +170,9 @@ static inline void __gov_queue_work(int cpu, struct dbs_data *dbs_data,
 {
        struct cpu_dbs_common_info *cdbs = dbs_data->cdata->get_cpu_cdbs(cpu);
 
+       if (WARN_ON(!cpu_online(cpu)))
+               return;
+
        mod_delayed_work_on(cpu, system_wq, &cdbs->work, delay);
 }
 
@@ -180,8 +184,10 @@ void gov_queue_work(struct dbs_data *dbs_data, struct cpufreq_policy *policy,
        if (!all_cpus) {
                __gov_queue_work(smp_processor_id(), dbs_data, delay);
        } else {
+               get_online_cpus();
                for_each_cpu(i, policy->cpus)
                        __gov_queue_work(i, dbs_data, delay);
+               put_online_cpus();
        }
 }
 EXPORT_SYMBOL_GPL(gov_queue_work);



Would you like to try it and see whether we trigger any WARN?

If still trigger WARN, then we could make sure the problem is
the wrong 'policy->cpus' ;-)

Regards,
Michael Wang

> 
> Regards,
> Michael Wang
> 
>> +
>> +       if (!cpu_online(cpu))
>> +               goto out;
>> +
>>         mod_delayed_work_on(cpu, system_wq, &cdbs->work, delay);
>> +
>> + out:
>> +       put_online_cpus();
>>  }
>>
>>  void gov_queue_work(struct dbs_data *dbs_data, struct cpufreq_policy *policy,
>> --
>>
>>
>> [   94.386340] EXT4-fs (sda7): re-mounted. Opts: (null)
>> [   96.520362] kvm: exiting hardware virtualization
>> [   96.637687] ACPI: Preparing to enter system sleep state S5
>> [   96.643506] Disabling non-boot CPUs ...
>> [   96.855499] ------------[ cut here ]------------
>> [   96.860172] WARNING: at drivers/cpufreq/cpufreq_governor.c:172 gov_queue_work+0xf0/0x110()
>> [   96.868501] Modules linked in: ext2 vfat fat loop usbhid snd_hda_codec_hdmi coretemp kvm_intel kvm snd_hda_codec_realtek snd_hda_intel snd_hda_codec ehci_pci xhci_hcd ehci_hcd usbcore crc32_pclmul crc32c_intel snd_hwdep snd_pcm snd_page_alloc snd_timer ghash_clmulni_intel snd aesni_intel aes_x86_64 glue_helper sb_edac edac_core acpi_cpufreq mperf pcspkr lrw gf128mul ablk_helper cryptd iTCO_wdt iTCO_vendor_support evdev soundcore lpc_ich mfd_core processor dcdbas i2c_i801 usb_common button microcode
>> [   96.914238] CPU: 0 PID: 315 Comm: kworker/1:2 Tainted: G        W    3.10.0-rc1+ #2
>> [   96.921969] Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013
>> [   96.929424] Workqueue: events od_dbs_timer
>> [   96.933574]  0000000000000009 ffff88043a08bc78 ffffffff8161445c ffff88043a08bcb8
>> [   96.941085]  ffffffff8103e540 ffff88043b712a80 0000000000000001 ffff88043a296400
>> [   96.948602]  ffff88043b712a80 ffffffff81cdc910 0000000000000001 ffff88043a08bcc8
>> [   96.956123] Call Trace:
>> [   96.958602]  [<ffffffff8161445c>] dump_stack+0x19/0x1b
>> [   96.963801]  [<ffffffff8103e540>] warn_slowpath_common+0x70/0xa0
>> [   96.969858]  [<ffffffff8103e58a>] warn_slowpath_null+0x1a/0x20
>> [   96.975735]  [<ffffffff814f6bf0>] gov_queue_work+0xf0/0x110
>> [   96.981359]  [<ffffffff814f60bb>] od_dbs_timer+0xcb/0x170
>> [   96.986808]  [<ffffffff8105e75d>] process_one_work+0x1fd/0x540
>> [   96.992691]  [<ffffffff8105e6f2>] ? process_one_work+0x192/0x540
>> [   96.998756]  [<ffffffff8105ef22>] worker_thread+0x122/0x380
>> [   97.004371]  [<ffffffff8105ee00>] ? rescuer_thread+0x320/0x320
>> [   97.010256]  [<ffffffff8106634a>] kthread+0xea/0xf0
>> [   97.015185]  [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
>> [   97.021605]  [<ffffffff81623d9c>] ret_from_fork+0x7c/0xb0
>> [   97.027049]  [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
>> [   97.033457] ---[ end trace d36d91c626ac81a0 ]---
>> [   97.039221] ------------[ cut here ]------------
>> [   97.039227] ------------[ cut here ]------------
>> [   97.039229] WARNING: at drivers/cpufreq/cpufreq_governor.c:172 gov_queue_work+0xf0/0x110()
>> [   97.039243] Modules linked in: ext2 vfat fat loop usbhid snd_hda_codec_hdmi coretemp kvm_intel kvm snd_hda_codec_realtek snd_hda_intel snd_hda_codec ehci_pci xhci_hcd ehci_hcd usbcore crc32_pclmul crc32c_intel snd_hwdep snd_pcm snd_page_alloc snd_timer ghash_clmulni_intel snd aesni_intel aes_x86_64 glue_helper sb_edac edac_core acpi_cpufreq mperf pcspkr lrw gf128mul ablk_helper cryptd iTCO_wdt iTCO_vendor_support evdev soundcore lpc_ich mfd_core processor dcdbas i2c_i801 usb_common button microcode
>> [   97.039245] CPU: 4 PID: 82 Comm: kworker/2:1 Tainted: G        W    3.10.0-rc1+ #2
>> [   97.039245] Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013
>> [   97.039248] Workqueue: events od_dbs_timer
>> [   97.039250]  0000000000000009 ffff88043b5cfc78 ffffffff8161445c ffff88043b5cfcb8
>> [   97.039251]  ffffffff8103e540 ffff88043b712a80 0000000000000002 ffff88043a295e00
>> [   97.039253]  ffff88043b712a80 ffffffff81cdc910 0000000000000002 ffff88043b5cfcc8
>> [   97.039253] Call Trace:
>> [   97.039255]  [<ffffffff8161445c>] dump_stack+0x19/0x1b
>> [   97.039257]  [<ffffffff8103e540>] warn_slowpath_common+0x70/0xa0
>> [   97.039258]  [<ffffffff8103e58a>] warn_slowpath_null+0x1a/0x20
>> [   97.039259]  [<ffffffff814f6bf0>] gov_queue_work+0xf0/0x110
>> [   97.039261]  [<ffffffff814f60bb>] od_dbs_timer+0xcb/0x170
>> [   97.039263]  [<ffffffff8105e75d>] process_one_work+0x1fd/0x540
>> [   97.039264]  [<ffffffff8105e6f2>] ? process_one_work+0x192/0x540
>> [   97.039265]  [<ffffffff8105ef22>] worker_thread+0x122/0x380
>> [   97.039267]  [<ffffffff8105ee00>] ? rescuer_thread+0x320/0x320
>> [   97.039268]  [<ffffffff8106634a>] kthread+0xea/0xf0
>> [   97.039269]  [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
>> [   97.039270]  [<ffffffff81623d9c>] ret_from_fork+0x7c/0xb0
>> [   97.039272]  [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
>> [   97.039272] ---[ end trace d36d91c626ac81a1 ]---
>> [   97.143214] nouveau E[     DRM] GPU lockup - switching to software fbcon
>> [   97.318430] WARNING: at drivers/cpufreq/cpufreq_governor.c:172 gov_queue_work+0xf0/0x110()
>> [   97.326804] Modules linked in: ext2 vfat fat loop usbhid snd_hda_codec_hdmi coretemp kvm_intel kvm snd_hda_codec_realtek snd_hda_intel snd_hda_codec ehci_pci xhci_hcd ehci_hcd usbcore crc32_pclmul crc32c_intel snd_hwdep snd_pcm snd_page_alloc snd_timer ghash_clmulni_intel snd aesni_intel aes_x86_64 glue_helper sb_edac edac_core acpi_cpufreq mperf pcspkr lrw gf128mul ablk_helper cryptd iTCO_wdt iTCO_vendor_support evdev soundcore lpc_ich mfd_core processor dcdbas i2c_i801 usb_common button microcode
>> [   97.374578] CPU: 0 PID: 98 Comm: kworker/3:1 Tainted: G        W    3.10.0-rc1+ #2
>> [   97.384154] Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013
>> [   97.393566] Workqueue: events od_dbs_timer
>> [   97.399675]  0000000000000009 ffff88043b179c78 ffffffff8161445c ffff88043b179cb8
>> [   97.409153]  ffffffff8103e540 ffff88043b712a80 0000000000000003 ffff88043a295a00
>> [   97.418623]  ffff88043b712a80 ffffffff81cdc910 0000000000000003 ffff88043b179cc8
>> [   97.428103] Call Trace:
>> [   97.432520]  [<ffffffff8161445c>] dump_stack+0x19/0x1b
>> [   97.439678]  [<ffffffff8103e540>] warn_slowpath_common+0x70/0xa0
>> [   97.447694]  [<ffffffff8103e58a>] warn_slowpath_null+0x1a/0x20
>> [   97.455512]  [<ffffffff814f6bf0>] gov_queue_work+0xf0/0x110
>> [   97.462993]  [<ffffffff814f60bb>] od_dbs_timer+0xcb/0x170
>> [   97.470259]  [<ffffffff8105e75d>] process_one_work+0x1fd/0x540
>> [   97.477878]  [<ffffffff8105e6f2>] ? process_one_work+0x192/0x540
>> [   97.485652]  [<ffffffff8105ef22>] worker_thread+0x122/0x380
>> [   97.492969]  [<ffffffff8105ee00>] ? rescuer_thread+0x320/0x320
>> [   97.500565]  [<ffffffff8106634a>] kthread+0xea/0xf0
>> [   97.507167]  [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
>> [   97.515255]  [<ffffffff81623d9c>] ret_from_fork+0x7c/0xb0
>> [   97.522389]  [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
>> [   97.530472] ---[ end trace d36d91c626ac81a2 ]---
>> [   97.543176] ------------[ cut here ]------------
>> [   97.547172] ------------[ cut here ]------------
>> [   97.547178] WARNING: at drivers/cpufreq/cpufreq_governor.c:172 gov_queue_work+0xf0/0x110()
>> [   97.547197] Modules linked in: ext2 vfat fat loop usbhid snd_hda_codec_hdmi coretemp kvm_intel kvm snd_hda_codec_realtek snd_hda_intel snd_hda_codec ehci_pci xhci_hcd ehci_hcd usbcore crc32_pclmul crc32c_intel snd_hwdep snd_pcm snd_page_alloc snd_timer ghash_clmulni_intel snd aesni_intel aes_x86_64 glue_helper sb_edac edac_core acpi_cpufreq mperf pcspkr lrw gf128mul ablk_helper cryptd iTCO_wdt iTCO_vendor_support evdev soundcore lpc_ich mfd_core processor dcdbas i2c_i801 usb_common button microcode
>> [   97.547199] CPU: 7 PID: 316 Comm: kworker/5:1 Tainted: G        W    3.10.0-rc1+ #2
>> [   97.547200] Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013
>> [   97.547202] Workqueue: events od_dbs_timer
>> [   97.547204]  0000000000000009 ffff88043905dc78 ffffffff8161445c ffff88043905dcb8
>> [   97.547205]  ffffffff8103e540 ffff88043b712a80 0000000000000005 ffff88043a295800
>> [   97.547206]  ffff88043b712a80 ffffffff81cdc910 0000000000000005 ffff88043905dcc8
>> [   97.547207] Call Trace:
>> [   97.547211]  [<ffffffff8161445c>] dump_stack+0x19/0x1b
>> [   97.547214]  [<ffffffff8103e540>] warn_slowpath_common+0x70/0xa0
>> [   97.547215]  [<ffffffff8103e58a>] warn_slowpath_null+0x1a/0x20
>> [   97.547216]  [<ffffffff814f6bf0>] gov_queue_work+0xf0/0x110
>> [   97.547218]  [<ffffffff814f60bb>] od_dbs_timer+0xcb/0x170
>> [   97.547220]  [<ffffffff8105e75d>] process_one_work+0x1fd/0x540
>> [   97.547221]  [<ffffffff8105e6f2>] ? process_one_work+0x192/0x540
>> [   97.547222]  [<ffffffff8105ef22>] worker_thread+0x122/0x380
>> [   97.547224]  [<ffffffff8105ee00>] ? rescuer_thread+0x320/0x320
>> [   97.547225]  [<ffffffff8106634a>] kthread+0xea/0xf0
>> [   97.547226]  [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
>> [   97.547228]  [<ffffffff81623d9c>] ret_from_fork+0x7c/0xb0
>> [   97.547229]  [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
>> [   97.547230] ---[ end trace d36d91c626ac81a3 ]---
>> [   97.761326] WARNING: at drivers/cpufreq/cpufreq_governor.c:172 gov_queue_work+0xf0/0x110()
>> [   97.770798] Modules linked in: ext2 vfat fat loop usbhid snd_hda_codec_hdmi coretemp kvm_intel kvm snd_hda_codec_realtek snd_hda_intel snd_hda_codec ehci_pci xhci_hcd ehci_hcd usbcore crc32_pclmul crc32c_intel snd_hwdep snd_pcm snd_page_alloc snd_timer ghash_clmulni_intel snd aesni_intel aes_x86_64 glue_helper sb_edac edac_core acpi_cpufreq mperf pcspkr lrw gf128mul ablk_helper cryptd iTCO_wdt iTCO_vendor_support evdev soundcore lpc_ich mfd_core processor dcdbas i2c_i801 usb_common button microcode
>> [   97.819617] CPU: 0 PID: 253 Comm: kworker/4:1 Tainted: G        W    3.10.0-rc1+ #2
>> [   97.828623] Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013
>> [   97.837372] Workqueue: events od_dbs_timer
>> [   97.842805]  0000000000000009 ffff880439529c78 ffffffff8161445c ffff880439529cb8
>> [   97.851628]  ffffffff8103e540 ffff88043b712a80 0000000000000004 ffff88043a295c00
>> [   97.860445]  ffff88043b712a80 ffffffff81cdc910 0000000000000004 ffff880439529cc8
>> [   97.869249] Call Trace:
>> [   97.873041]  [<ffffffff8161445c>] dump_stack+0x19/0x1b
>> [   97.879533]  [<ffffffff8103e540>] warn_slowpath_common+0x70/0xa0
>> [   97.886912]  [<ffffffff8103e58a>] warn_slowpath_null+0x1a/0x20
>> [   97.894100]  [<ffffffff814f6bf0>] gov_queue_work+0xf0/0x110
>> [   97.901002]  [<ffffffff814f60bb>] od_dbs_timer+0xcb/0x170
>> [   97.907706]  [<ffffffff8105e75d>] process_one_work+0x1fd/0x540
>> [   97.914797]  [<ffffffff8105e6f2>] ? process_one_work+0x192/0x540
>> [   97.922016]  [<ffffffff8105ef22>] worker_thread+0x122/0x380
>> [   97.928803]  [<ffffffff8105ee00>] ? rescuer_thread+0x320/0x320
>> [   97.935837]  [<ffffffff8106634a>] kthread+0xea/0xf0
>> [   97.941900]  [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
>> [   97.949443]  [<ffffffff81623d9c>] ret_from_fork+0x7c/0xb0
>> [   97.956027]  [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
>> [   97.963563] ---[ end trace d36d91c626ac81a4 ]---
>> [   97.970449] ------------[ cut here ]------------
>> [   97.976277] WARNING: at drivers/cpufreq/cpufreq_governor.c:172 gov_queue_work+0xf0/0x110()
>> [   97.985762] Modules linked in: ext2 vfat fat loop usbhid snd_hda_codec_hdmi coretemp kvm_intel kvm snd_hda_codec_realtek snd_hda_intel snd_hda_codec ehci_pci xhci_hcd ehci_hcd usbcore crc32_pclmul crc32c_intel snd_hwdep snd_pcm snd_page_alloc snd_timer ghash_clmulni_intel snd aesni_intel aes_x86_64 glue_helper sb_edac edac_core acpi_cpufreq mperf pcspkr lrw gf128mul ablk_helper cryptd iTCO_wdt iTCO_vendor_support evdev soundcore lpc_ich mfd_core processor dcdbas i2c_i801 usb_common button microcode
>> [   98.035051] CPU: 0 PID: 102 Comm: kworker/6:1 Tainted: G        W    3.10.0-rc1+ #2
>> [   98.044067] Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013
>> [   98.052834] Workqueue: events od_dbs_timer
>> [   98.058285]  0000000000000009 ffff88043b6f3c78 ffffffff8161445c ffff88043b6f3cb8
>> [   98.067114]  ffffffff8103e540 ffff88043b712a80 0000000000000006 ffff88043a295600
>> [   98.075924]  ffff88043b712a80 ffffffff81cdc910 0000000000000006 ffff88043b6f3cc8
>> [   98.084735] Call Trace:
>> [   98.088518]  [<ffffffff8161445c>] dump_stack+0x19/0x1b
>> [   98.095024]  [<ffffffff8103e540>] warn_slowpath_common+0x70/0xa0
>> [   98.102386]  [<ffffffff8103e58a>] warn_slowpath_null+0x1a/0x20
>> [   98.109565]  [<ffffffff814f6bf0>] gov_queue_work+0xf0/0x110
>> [   98.116502]  [<ffffffff814f60bb>] od_dbs_timer+0xcb/0x170
>> [   98.123253]  [<ffffffff8105e75d>] process_one_work+0x1fd/0x540
>> [   98.130394]  [<ffffffff8105e6f2>] ? process_one_work+0x192/0x540
>> [   98.137667]  [<ffffffff8105ef22>] worker_thread+0x122/0x380
>> [   98.144456]  [<ffffffff8105ee00>] ? rescuer_thread+0x320/0x320
>> [   98.151510]  [<ffffffff8106634a>] kthread+0xea/0xf0
>> [   98.157583]  [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
>> [   98.165143]  [<ffffffff81623d9c>] ret_from_fork+0x7c/0xb0
>> [   98.171730]  [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
>> [   98.179282] ---[ end trace d36d91c626ac81a5 ]---
>> [   98.185098] ------------[ cut here ]------------
>> [   98.190903] WARNING: at drivers/cpufreq/cpufreq_governor.c:172 gov_queue_work+0xf0/0x110()
>> [   98.200387] Modules linked in: ext2 vfat fat loop
>> [   98.205029] nouveau W[   PFIFO][0000:03:00.0] unknown intr 0x00400000, ch 1
>> [   98.214563]  usbhid snd_hda_codec_hdmi coretemp kvm_intel kvm snd_hda_codec_realtek snd_hda_intel snd_hda_codec ehci_pci xhci_hcd ehci_hcd usbcore crc32_pclmul crc32c_intel snd_hwdep snd_pcm snd_page_alloc snd_timer ghash_clmulni_intel snd aesni_intel aes_x86_64 glue_helper sb_edac edac_core acpi_cpufreq mperf pcspkr lrw gf128mul ablk_helper cryptd iTCO_wdt iTCO_vendor_support evdev soundcore lpc_ich mfd_core processor dcdbas i2c_i801 usb_common button microcode
>> [   98.258886] CPU: 0 PID: 318 Comm: kworker/7:1 Tainted: G        W    3.10.0-rc1+ #2
>> [   98.267919] Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013
>> [   98.276689] Workqueue: events od_dbs_timer
>> [   98.282147]  0000000000000009 ffff88043969dc78 ffffffff8161445c ffff88043969dcb8
>> [   98.290991]  ffffffff8103e540 ffff88043b712a80 0000000000000007 ffff88043a295200
>> [   98.299832]  ffff88043b712a80 ffffffff81cdc910 0000000000000007 ffff88043969dcc8
>> [   98.308671] Call Trace:
>> [   98.312471]  [<ffffffff8161445c>] dump_stack+0x19/0x1b
>> [   98.318982]  [<ffffffff8103e540>] warn_slowpath_common+0x70/0xa0
>> [   98.326376]  [<ffffffff8103e58a>] warn_slowpath_null+0x1a/0x20
>> [   98.333577]  [<ffffffff814f6bf0>] gov_queue_work+0xf0/0x110
>> [   98.340482]  [<ffffffff814f60bb>] od_dbs_timer+0xcb/0x170
>> [   98.347160]  [<ffffffff8105e75d>] process_one_work+0x1fd/0x540
>> [   98.354232]  [<ffffffff8105e6f2>] ? process_one_work+0x192/0x540
>> [   98.361471]  [<ffffffff8105ef22>] worker_thread+0x122/0x380
>> [   98.368260]  [<ffffffff8105ee00>] ? rescuer_thread+0x320/0x320
>> [   98.375309]  [<ffffffff8106634a>] kthread+0xea/0xf0
>> [   98.381385]  [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
>> [   98.388951]  [<ffffffff81623d9c>] ret_from_fork+0x7c/0xb0
>> [   98.395546]  [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
>> [   98.403097] ---[ end trace d36d91c626ac81a6 ]---
>> [   98.409180] Power down.
>> [   98.413109] acpi_power_off called
>>
> 

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