On 05/20/2013 09:23 PM, Borislav Petkov wrote:
> On Mon, May 20, 2013 at 05:24:05PM +0800, Michael Wang wrote:
>>>> diff --git a/drivers/cpufreq/cpufreq_governor.c
>>>> b/drivers/cpufreq/cpufreq_governor.c
>>>> index 443442d..449be88 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"
>>>>
>>>> @@ -180,8 +181,10 @@ 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);
>>>>
>>>> This is supposed to make WARN disappear, if it works, then BINGO :)
>>>
>>> Let people test it and then we can talk :)
>>
>> Agree :)
>>
>> Borislav, would you like to take a try?
>>
>> If this fix cause other troubles, you could try get_cpu() or disable irq
>> also.
>
> I just confirmed that policy->cpus contains offlined cores with this:
>
> diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c
> index 5af40ad82d23..e8c25f71e9b6 100644
> --- a/drivers/cpufreq/cpufreq_governor.c
> +++ b/drivers/cpufreq/cpufreq_governor.c
> @@ -169,6 +169,9 @@ 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;
> +
This is not enough to prove that policy->cpus is wrong, the cpu could be
online when get from policy->cpus, but offline when checked here, since
hotplug is able to happen during the period.
> mod_delayed_work_on(cpu, system_wq, &cdbs->work, delay);
> }
>
> see splats collection below.
>
> And I don't think your fix above addresses the issue for the simple
> reason that if cpus go offline *before* you do get_online_cpus(), then
> policy->cpus will already contain offlined cpus.
I don't get it...
get_online_cpus() is just stop hotplug happen after it was invoked, so
unless policy->cpus is really wrong, otherwise all the cpu it masked
won't go offline any more.
>
> Rather, a better fix would be, IMHO, to do this (it works here, of course):
>
> ---
> diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c
> index 5af40ad82d23..58541b164494 100644
> --- a/drivers/cpufreq/cpufreq_governor.c
> +++ b/drivers/cpufreq/cpufreq_governor.c
> @@ -17,6 +17,7 @@
> #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>
> #include <asm/cputime.h>
> +#include <linux/cpu.h>
> #include <linux/cpufreq.h>
> #include <linux/cpumask.h>
> #include <linux/export.h>
> @@ -169,7 +170,15 @@ 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);
>
> + get_online_cpus();
This protect nothing...before we go here, the cpu could already offline,
nothing changed...
If you really want to confirm the policy->cpus was wrong, the way should
be apply the fix I suggested, than check online in here.
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...
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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