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Date: Mon, 20 May 2013 11:16:33 +0800
From: Michael Wang <wangyun@...ux.vnet.ibm.com>
To: Borislav Petkov <bp@...en8.de>
CC: "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>
Subject: Re: NOHZ: WARNING: at arch/x86/kernel/smp.c:123 native_smp_send_reschedule,
round 2
Hi, Borislav
On 05/17/2013 09:56 PM, Borislav Petkov wrote:
[snip]
> [ 51.737378] [<ffffffff81025628>] native_smp_send_reschedule+0x58/0x60
> [ 51.744013] [<ffffffff81072cfd>] wake_up_nohz_cpu+0x2d/0xa0
I suppose the reason is that the cpu we passed to mod_delayed_work_on()
has a chance to become offline before we disabled irq, what about check
it before send resched ipi? like:
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index bfa7e77..d0e8f15 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -626,7 +626,7 @@ static bool wake_up_full_nohz_cpu(int cpu)
void wake_up_nohz_cpu(int cpu)
{
- if (!wake_up_full_nohz_cpu(cpu))
+ if (cpu_online(cpu) && !wake_up_full_nohz_cpu(cpu))
wake_up_idle_cpu(cpu);
}
Regards,
Michael Wang
> [ 51.749745] [<ffffffff8104f6bf>] add_timer_on+0x8f/0x110
> [ 51.755214] [<ffffffff8105f6fe>] __queue_delayed_work+0x16e/0x1a0
> [ 51.761470] [<ffffffff8105f251>] ? try_to_grab_pending+0xd1/0x1a0
> [ 51.767724] [<ffffffff8105f78a>] mod_delayed_work_on+0x5a/0xa0
> [ 51.773719] [<ffffffff814f6b5d>] gov_queue_work+0x4d/0xc0
> [ 51.779271] [<ffffffff814f60cb>] od_dbs_timer+0xcb/0x170
> [ 51.784734] [<ffffffff8105e75d>] process_one_work+0x1fd/0x540
> [ 51.790634] [<ffffffff8105e6f2>] ? process_one_work+0x192/0x540
> [ 51.796711] [<ffffffff8105ef22>] worker_thread+0x122/0x380
> [ 51.802350] [<ffffffff8105ee00>] ? rescuer_thread+0x320/0x320
> [ 51.808264] [<ffffffff8106634a>] kthread+0xea/0xf0
> [ 51.813200] [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
> [ 51.819644] [<ffffffff81623d5c>] ret_from_fork+0x7c/0xb0
> [ 51.918165] nouveau E[ DRM] GPU lockup - switching to software fbcon
> [ 51.930505] [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
> [ 51.936994] ---[ end trace f419538ada83b5c5 ]---
> [ 51.942915] ------------[ cut here ]------------
> [ 51.942928] ------------[ cut here ]------------
> [ 51.942936] WARNING: at arch/x86/kernel/smp.c:123 native_smp_send_reschedule+0x58/0x60()
> [ 51.942974] Modules linked in: ext2 vfat fat loop snd_hda_codec_hdmi usbhid snd_hda_codec_realtek coretemp kvm_intel kvm snd_hda_intel snd_hda_codec crc32_pclmul crc32c_intel ghash_clmulni_intel snd_hwdep snd_pcm aesni_intel sb_edac aes_x86_64 ehci_pci snd_page_alloc glue_helper snd_timer xhci_hcd snd iTCO_wdt iTCO_vendor_support ehci_hcd edac_core lpc_ich acpi_cpufreq lrw gf128mul ablk_helper cryptd mperf usbcore usb_common soundcore mfd_core dcdbas evdev pcspkr processor i2c_i801 button microcode
> [ 51.942978] CPU: 5 PID: 740 Comm: kworker/3:2 Tainted: G W 3.10.0-rc1+ #10
> [ 51.942979] Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013
> [ 51.942985] Workqueue: events od_dbs_timer
> [ 51.942990] 0000000000000009 ffff88043ab0db68 ffffffff8161441c ffff88043ab0dba8
> [ 51.942994] ffffffff8103e540 000000003ab0dbf8 0000000000000003 ffff88043d708000
> [ 51.942998] 00000000ffff0d32 0000000000000003 ffff88044fccfc08 ffff88043ab0dbb8
> [ 51.942999] Call Trace:
> [ 51.943005] [<ffffffff8161441c>] dump_stack+0x19/0x1b
> [ 51.943010] [<ffffffff8103e540>] warn_slowpath_common+0x70/0xa0
> [ 51.943014] [<ffffffff8103e58a>] warn_slowpath_null+0x1a/0x20
> [ 51.943017] [<ffffffff81025628>] native_smp_send_reschedule+0x58/0x60
> [ 51.943021] [<ffffffff81072cfd>] wake_up_nohz_cpu+0x2d/0xa0
> [ 51.943027] [<ffffffff8104f6bf>] add_timer_on+0x8f/0x110
> [ 51.943031] [<ffffffff8105f6fe>] __queue_delayed_work+0x16e/0x1a0
> [ 51.943035] [<ffffffff8105f251>] ? try_to_grab_pending+0xd1/0x1a0
> [ 51.943038] [<ffffffff8105f78a>] mod_delayed_work_on+0x5a/0xa0
> [ 51.943043] [<ffffffff814f6b5d>] gov_queue_work+0x4d/0xc0
> [ 51.943046] [<ffffffff814f60cb>] od_dbs_timer+0xcb/0x170
> [ 51.943050] [<ffffffff8105e75d>] process_one_work+0x1fd/0x540
> [ 51.943053] [<ffffffff8105e6f2>] ? process_one_work+0x192/0x540
> [ 51.943057] [<ffffffff8105ef22>] worker_thread+0x122/0x380
> [ 51.943060] [<ffffffff8105ee00>] ? rescuer_thread+0x320/0x320
> [ 51.943063] [<ffffffff8106634a>] kthread+0xea/0xf0
> [ 51.943068] [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
> [ 51.943071] [<ffffffff81623d5c>] ret_from_fork+0x7c/0xb0
> [ 51.943074] [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
> [ 51.943076] ---[ end trace f419538ada83b5c6 ]---
> [ 52.178461] WARNING: at arch/x86/kernel/smp.c:123 native_smp_send_reschedule+0x58/0x60()
> [ 52.188097] Modules linked in: ext2 vfat fat loop snd_hda_codec_hdmi usbhid snd_hda_codec_realtek coretemp kvm_intel kvm snd_hda_intel snd_hda_codec crc32_pclmul crc32c_intel ghash_clmulni_intel snd_hwdep snd_pcm aesni_intel sb_edac aes_x86_64 ehci_pci snd_page_alloc glue_helper snd_timer xhci_hcd snd iTCO_wdt iTCO_vendor_support ehci_hcd edac_core lpc_ich acpi_cpufreq lrw gf128mul ablk_helper cryptd mperf usbcore usb_common soundcore mfd_core dcdbas evdev pcspkr processor i2c_i801 button microcode
> [ 52.238477] CPU: 0 PID: 85 Comm: kworker/2:1 Tainted: G W 3.10.0-rc1+ #10
> [ 52.247669] Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013
> [ 52.256604] Workqueue: events od_dbs_timer
> [ 52.262219] 0000000000000009 ffff88043b62db68 ffffffff8161441c ffff88043b62dba8
> [ 52.271194] ffffffff8103e540 0000000000000033 0000000000000002 ffff88043d6dc000
> [ 52.280163] 00000000ffff0d32 0000000000000002 ffff88044fc8fc08 ffff88043b62dbb8
> [ 52.289141] Call Trace:
> [ 52.293066] [<ffffffff8161441c>] dump_stack+0x19/0x1b
> [ 52.299704] [<ffffffff8103e540>] warn_slowpath_common+0x70/0xa0
> [ 52.307213] [<ffffffff8103e58a>] warn_slowpath_null+0x1a/0x20
> [ 52.314540] [<ffffffff81025628>] native_smp_send_reschedule+0x58/0x60
> [ 52.322592] [<ffffffff81072cfd>] wake_up_nohz_cpu+0x2d/0xa0
> [ 52.329763] [<ffffffff8104f6bf>] add_timer_on+0x8f/0x110
> [ 52.336660] [<ffffffff8105f6fe>] __queue_delayed_work+0x16e/0x1a0
> [ 52.344349] [<ffffffff8105f251>] ? try_to_grab_pending+0xd1/0x1a0
> [ 52.352031] [<ffffffff8105f78a>] mod_delayed_work_on+0x5a/0xa0
> [ 52.359458] [<ffffffff814f6b5d>] gov_queue_work+0x4d/0xc0
> [ 52.366438] [<ffffffff814f60cb>] od_dbs_timer+0xcb/0x170
> [ 52.373338] [<ffffffff8105e75d>] process_one_work+0x1fd/0x540
> [ 52.380670] [<ffffffff8105e6f2>] ? process_one_work+0x192/0x540
> [ 52.388176] [<ffffffff8105ef22>] worker_thread+0x122/0x380
> [ 52.395247] [<ffffffff8105ee00>] ? rescuer_thread+0x320/0x320
> [ 52.402588] [<ffffffff8106634a>] kthread+0xea/0xf0
> [ 52.408954] [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
> [ 52.416830] [<ffffffff81623d5c>] ret_from_fork+0x7c/0xb0
> [ 52.423722] [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
> [ 52.431588] ---[ end trace f419538ada83b5c7 ]---
> [ 52.460411] ------------[ cut here ]------------
> [ 52.467744] WARNING: at arch/x86/kernel/smp.c:123 native_smp_send_reschedule+0x58/0x60()
> [ 52.478684] Modules linked in: ext2 vfat fat loop snd_hda_codec_hdmi usbhid snd_hda_codec_realtek coretemp kvm_intel kvm snd_hda_intel snd_hda_codec crc32_pclmul crc32c_intel ghash_clmulni_intel snd_hwdep snd_pcm aesni_intel sb_edac aes_x86_64 ehci_pci snd_page_alloc glue_helper snd_timer xhci_hcd snd iTCO_wdt iTCO_vendor_support ehci_hcd edac_core lpc_ich acpi_cpufreq lrw gf128mul ablk_helper cryptd mperf usbcore usb_common soundcore mfd_core dcdbas evdev pcspkr processor i2c_i801 button microcode
> [ 52.533573] CPU: 5 PID: 740 Comm: kworker/3:2 Tainted: G W 3.10.0-rc1+ #10
> [ 52.544303] ------------[ cut here ]------------
> [ 52.544305] WARNING: at arch/x86/kernel/smp.c:123 native_smp_send_reschedule+0x58/0x60()
> [ 52.544317] Modules linked in: ext2 vfat fat loop snd_hda_codec_hdmi usbhid snd_hda_codec_realtek coretemp kvm_intel kvm snd_hda_intel snd_hda_codec crc32_pclmul crc32c_intel ghash_clmulni_intel snd_hwdep snd_pcm aesni_intel sb_edac aes_x86_64 ehci_pci snd_page_alloc glue_helper snd_timer xhci_hcd snd iTCO_wdt iTCO_vendor_support ehci_hcd edac_core lpc_ich acpi_cpufreq lrw gf128mul ablk_helper cryptd mperf usbcore usb_common soundcore mfd_core dcdbas evdev pcspkr processor i2c_i801 button microcode
> [ 52.544318] CPU: 0 PID: 71 Comm: kworker/4:1 Tainted: G W 3.10.0-rc1+ #10
> [ 52.544318] Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013
> [ 52.544322] Workqueue: events od_dbs_timer
> [ 52.544324] 0000000000000009 ffff88043c271b68 ffffffff8161441c ffff88043c271ba8
> [ 52.544325] ffffffff8103e540 0000000000000033 0000000000000004 ffff88043d738000
> [ 52.544326] 00000000ffff0dc8 0000000000000004 ffff88044fd0fc08 ffff88043c271bb8
> [ 52.544327] Call Trace:
> [ 52.544330] [<ffffffff8161441c>] dump_stack+0x19/0x1b
> [ 52.544333] [<ffffffff8103e540>] warn_slowpath_common+0x70/0xa0
> [ 52.544334] [<ffffffff8103e58a>] warn_slowpath_null+0x1a/0x20
> [ 52.544335] [<ffffffff81025628>] native_smp_send_reschedule+0x58/0x60
> [ 52.544337] [<ffffffff81072cfd>] wake_up_nohz_cpu+0x2d/0xa0
> [ 52.544340] [<ffffffff8104f6bf>] add_timer_on+0x8f/0x110
> [ 52.544342] [<ffffffff8105f6fe>] __queue_delayed_work+0x16e/0x1a0
> [ 52.544343] [<ffffffff8105f251>] ? try_to_grab_pending+0xd1/0x1a0
> [ 52.544344] [<ffffffff8105f78a>] mod_delayed_work_on+0x5a/0xa0
> [ 52.544346] [<ffffffff814f6b5d>] gov_queue_work+0x4d/0xc0
> [ 52.544347] [<ffffffff814f60cb>] od_dbs_timer+0xcb/0x170
> [ 52.544348] [<ffffffff8105e75d>] process_one_work+0x1fd/0x540
> [ 52.544349] [<ffffffff8105e6f2>] ? process_one_work+0x192/0x540
> [ 52.544350] [<ffffffff8105ef22>] worker_thread+0x122/0x380
> [ 52.544351] [<ffffffff8105ee00>] ? rescuer_thread+0x320/0x320
> [ 52.544353] [<ffffffff8106634a>] kthread+0xea/0xf0
> [ 52.544354] [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
> [ 52.544356] [<ffffffff81623d5c>] ret_from_fork+0x7c/0xb0
> [ 52.544357] [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
> [ 52.544357] ---[ end trace f419538ada83b5c8 ]---
> [ 52.798038] Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013
> [ 52.806551] Workqueue: events od_dbs_timer
> [ 52.811736] 0000000000000009 ffff88043ab0db68 ffffffff8161441c ffff88043ab0dba8
> [ 52.820284] ffffffff8103e540 0000000000000033 0000000000000003 ffff88043d708000
> [ 52.828828] 00000000ffff0db3 0000000000000003 ffff88044fccfc08 ffff88043ab0dbb8
> [ 52.837372] Call Trace:
> [ 52.840874] [<ffffffff8161441c>] dump_stack+0x19/0x1b
> [ 52.847090] [<ffffffff8103e540>] warn_slowpath_common+0x70/0xa0
> [ 52.854176] [<ffffffff8103e58a>] warn_slowpath_null+0x1a/0x20
> [ 52.861086] [<ffffffff81025628>] native_smp_send_reschedule+0x58/0x60
> [ 52.868694] [<ffffffff81072cfd>] wake_up_nohz_cpu+0x2d/0xa0
> [ 52.875432] [<ffffffff8104f6bf>] add_timer_on+0x8f/0x110
> [ 52.881902] [<ffffffff8105f6fe>] __queue_delayed_work+0x16e/0x1a0
> [ 52.889160] [<ffffffff8105f251>] ? try_to_grab_pending+0xd1/0x1a0
> [ 52.896416] [<ffffffff8105f78a>] mod_delayed_work_on+0x5a/0xa0
> [ 52.903409] [<ffffffff814f6b5d>] gov_queue_work+0x4d/0xc0
> [ 52.909966] [<ffffffff814f60cb>] od_dbs_timer+0xcb/0x170
> [ 52.916434] [<ffffffff8105e75d>] process_one_work+0x1fd/0x540
> [ 52.923342] [<ffffffff8105e6f2>] ? process_one_work+0x192/0x540
> [ 52.930427] [<ffffffff8105ef22>] worker_thread+0x122/0x380
> [ 52.937074] [<ffffffff8105ee00>] ? rescuer_thread+0x320/0x320
> [ 52.943983] [<ffffffff8106634a>] kthread+0xea/0xf0
> [ 52.949926] [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
> [ 52.957370] [<ffffffff81623d5c>] ret_from_fork+0x7c/0xb0
> [ 52.963841] [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
> [ 52.971275] ---[ end trace f419538ada83b5c9 ]---
> [ 52.976979] nouveau W[ PFIFO][0000:03:00.0] unknown intr 0x00400000, ch 1
> [ 53.092122] ------------[ cut here ]------------
> [ 53.099585] WARNING: at arch/x86/kernel/smp.c:123 native_smp_send_reschedule+0x58/0x60()
> [ 53.110571] Modules linked in: ext2 vfat fat loop snd_hda_codec_hdmi usbhid snd_hda_codec_realtek coretemp kvm_intel kvm snd_hda_intel snd_hda_codec crc32_pclmul crc32c_intel ghash_clmulni_intel snd_hwdep snd_pcm aesni_intel sb_edac aes_x86_64 ehci_pci snd_page_alloc glue_helper snd_timer xhci_hcd snd iTCO_wdt iTCO_vendor_support ehci_hcd edac_core lpc_ich acpi_cpufreq lrw gf128mul ablk_helper cryptd mperf usbcore usb_common soundcore mfd_core dcdbas evdev pcspkr processor i2c_i801 button microcode
> [ 53.165267] CPU: 0 PID: 123 Comm: kworker/5:1 Tainted: G W 3.10.0-rc1+ #10
> [ 53.175902] Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013
> [ 53.186190] Workqueue: events od_dbs_timer
> [ 53.193136] 0000000000000009 ffff88043b277b68 ffffffff8161441c ffff88043b277ba8
> [ 53.203477] ffffffff8103e540 000000003b277bb8 0000000000000005 ffff88043d764000
> [ 53.213727] 00000000ffff0e52 0000000000000005 ffff88044fd4fc08 ffff88043b277bb8
> [ 53.223894] Call Trace:
> [ 53.228887] [<ffffffff8161441c>] dump_stack+0x19/0x1b
> [ 53.236593] [<ffffffff8103e540>] warn_slowpath_common+0x70/0xa0
> [ 53.245160] [<ffffffff8103e58a>] warn_slowpath_null+0x1a/0x20
> [ 53.253519] [<ffffffff81025628>] native_smp_send_reschedule+0x58/0x60
> [ 53.262582] [<ffffffff81072cfd>] wake_up_nohz_cpu+0x2d/0xa0
> [ 53.270756] [<ffffffff8104f6bf>] add_timer_on+0x8f/0x110
> [ 53.278654] [<ffffffff8105f6fe>] __queue_delayed_work+0x16e/0x1a0
> [ 53.287335] [<ffffffff8105f251>] ? try_to_grab_pending+0xd1/0x1a0
> [ 53.296002] [<ffffffff8105f78a>] mod_delayed_work_on+0x5a/0xa0
> [ 53.304412] [<ffffffff814f6b5d>] gov_queue_work+0x4d/0xc0
> [ 53.312388] [<ffffffff814f60cb>] od_dbs_timer+0xcb/0x170
> [ 53.320267] [<ffffffff8105e75d>] process_one_work+0x1fd/0x540
> [ 53.328584] [<ffffffff8105e6f2>] ? process_one_work+0x192/0x540
> [ 53.337083] [<ffffffff8105ef22>] worker_thread+0x122/0x380
> [ 53.345142] [<ffffffff8105ee00>] ? rescuer_thread+0x320/0x320
> [ 53.353484] [<ffffffff8106634a>] kthread+0xea/0xf0
> [ 53.360847] [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
> [ 53.369709] [<ffffffff81623d5c>] ret_from_fork+0x7c/0xb0
> [ 53.377603] [<ffffffff81066260>] ? flush_kthread_worker+0x150/0x150
> [ 53.386474] ---[ end trace f419538ada83b5ca ]---
> [ 53.395276] Power down.
> [ 53.399033] acpi_power_off called
>
--
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