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Groups > linux.kernel > #1453718 > unrolled thread

mmiotracer hangs the system

Started byAndy Shevchenko <andy.shevchenko@gmail.com>
First post2016-08-02 12:10 +0200
Last post2016-08-02 18:30 +0200
Articles 8 — 3 participants

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  mmiotracer hangs the system Andy Shevchenko <andy.shevchenko@gmail.com> - 2016-08-02 12:10 +0200
    Re: mmiotracer hangs the system Andy Shevchenko <andy.shevchenko@gmail.com> - 2016-08-02 12:50 +0200
    Re: mmiotracer hangs the system Andy Shevchenko <andy.shevchenko@gmail.com> - 2016-08-02 17:10 +0200
      Re: mmiotracer hangs the system Andy Shevchenko <andy.shevchenko@gmail.com> - 2016-08-02 17:10 +0200
        Re: mmiotracer hangs the system Steven Rostedt <rostedt@goodmis.org> - 2016-08-02 17:40 +0200
          Re: mmiotracer hangs the system Steven Rostedt <rostedt@goodmis.org> - 2016-08-02 18:20 +0200
            Re: mmiotracer hangs the system karol herbst <karolherbst@gmail.com> - 2016-08-03 20:40 +0200
          Re: mmiotracer hangs the system Andy Shevchenko <andy.shevchenko@gmail.com> - 2016-08-02 18:30 +0200

#1453718 — mmiotracer hangs the system

FromAndy Shevchenko <andy.shevchenko@gmail.com>
Date2016-08-02 12:10 +0200
Subjectmmiotracer hangs the system
Message-ID<s1EO7-30z-49@gated-at.bofh.it>
Hi!

I'm trying to use mmio tracer with recent kernels (in this particular
case today's linux-next).

# mount -t debugfs none /sys/kernel/debug/

# echo mmiotrace > /sys/kernel/debug/tracing/current_tracer
[  869.673145] in mmio_trace_init
[  869.714170] mmiotrace: Disabling non-boot CPUs...
[  869.729938] Cannot set affinity for irq 169
[  869.735765] smpboot: CPU 1 is now offline
[  869.746662] mmiotrace: CPU1 is down.
[  869.757896] smpboot: CPU 2 is now offline
[  869.773572] mmiotrace: CPU2 is down.
[  869.781768] smpboot: CPU 3 is now offline
[  869.789495] mmiotrace: CPU3 is down.
[  869.793515] mmiotrace: enabled.

#  echo 1 > /sys/kernel/debug/tracing/tracing_on
[  869.802634] in mmio_trace_start

# echo 0000:00:18.1 > /sys/bus/pci/drivers/intel-lpss/unbind
[  883.625744] mmiotrace: Unmapping ffffc90000854000.
[  883.633925] mmiotrace: Unmapping ffffc90000852000.
[  883.644580] mmiotrace: Unmapping ffffc90000850000.

# echo 0000:00:18.1 > /sys/bus/pci/drivers/intel-lpss/bind
[  889.525125] mmiotrace: ioremap_*(0x9242e200, 0x100) = ffffc90000856200

[  910.533911] INFO: rcu_sched detected stalls on CPUs/tasks:
[  910.540052]  (detected by 0, t=21002 jiffies, g=348, c=347, q=0)
[  910.546790] All QSes seen, last rcu_sched kthread activity 21002
(4295577777-4295556775), jiffies_till_next_fqs=3, root ->qsm
ask 0x0
[  910.560142] sh              R  running task    12336  1289      1 0x20020008
[  910.568055]  ffffffff81e422c0 ffff88017fc03e20 ffffffff81085296
ffff88017fc18500
[  910.576366]  ffffffff81e422c0 ffff88017fc03e88 ffffffff810b547d
0000000000000000
[  910.584675]  ffffffff810f67ec 000000000000015c 0000000000000000
000000000000015c
[  910.592980] Call Trace:
[  910.595715]  <IRQ>  [<ffffffff81085296>] sched_show_task+0xb6/0x110
[  910.602748]  [<ffffffff810b547d>] rcu_check_callbacks+0x84d/0x850
[  910.609573]  [<ffffffff810f67ec>] ? __acct_update_integrals+0x2c/0xb0
[  910.616788]  [<ffffffff810c9150>] ? tick_sched_do_timer+0x30/0x30
[  910.623613]  [<ffffffff810ba34a>] update_process_times+0x2a/0x50
[  910.630343]  [<ffffffff810c8bb1>] tick_sched_handle.isra.12+0x31/0x40
[  910.637560]  [<ffffffff810c9188>] tick_sched_timer+0x38/0x70
[  910.643902]  [<ffffffff810bacba>] __hrtimer_run_queues+0xda/0x250
[  910.650734]  [<ffffffff810bb3f3>] hrtimer_interrupt+0xa3/0x190
[  910.657272]  [<ffffffff8103ead3>] local_apic_timer_interrupt+0x33/0x50
[  910.664584]  [<ffffffff8103f588>] smp_apic_timer_interrupt+0x38/0x50
[  910.671705]  [<ffffffff8190dd6f>] apic_timer_interrupt+0x7f/0x90
[  910.678427]  <EOI>  [<ffffffff814a717f>] ? intel_lpss_probe+0x7f/0x5f0
[  910.685739]  [<ffffffff814a716b>] ? intel_lpss_probe+0x6b/0x5f0
[  910.692364]  [<ffffffff8170e5df>] ? raw_pci_write+0x1f/0x40
[  910.698610]  [<ffffffff8136e825>] ? pci_bus_write_config_byte+0x55/0x70
[  910.706022]  [<ffffffff813781b1>] ? pcibios_set_master+0x51/0x80
[  910.712753]  [<ffffffff814a7836>] intel_lpss_pci_probe+0x76/0xb0
[  910.719479]  [<ffffffff813797e0>] local_pci_probe+0x40/0xa0
[  910.725719]  [<ffffffff811fce44>] ? sysfs_do_create_link_sd.isra.2+0x64/0xa0
[  910.733617]  [<ffffffff8137ab46>] pci_device_probe+0xd6/0x120
[  910.740058]  [<ffffffff8148679f>] driver_probe_device+0x21f/0x430
[  910.746883]  [<ffffffff81484c4f>] bind_store+0x10f/0x160
[  910.752836]  [<ffffffff81484150>] drv_attr_store+0x20/0x30
[  910.758983]  [<ffffffff811fc312>] sysfs_kf_write+0x32/0x40
[  910.765129]  [<ffffffff811fb863>] kernfs_fop_write+0x113/0x190
[  910.771663]  [<ffffffff81185343>] __vfs_write+0x23/0x120
[  910.777607]  [<ffffffff812cfd46>] ? security_file_permission+0x36/0xb0
[  910.784918]  [<ffffffff810998dd>] ? percpu_down_read+0xd/0x50
[  910.791351]  [<ffffffff81186403>] vfs_write+0xb3/0x1b0
[  910.797103]  [<ffffffff81187711>] SyS_write+0x41/0xa0
[  910.802758]  [<ffffffff81002b2e>] do_int80_syscall_32+0x4e/0xa0
[  910.809389]  [<ffffffff8190f2aa>] entry_INT80_compat+0x2a/0x40
[  910.815925] rcu_sched kthread starved for 21002 jiffies! g348 c347
f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0
[  910.826351] rcu_sched       R  running task    14896     7      2 0x00000000
[  910.834260]  ffff88017ab7bd88 ffff880179c17080 ffff88017ab34b00
0000000000000000
[  910.842550]  ffff88017ab7c000 ffff88017ab7bdd0 00000000ffffffff
0000000000000000
[  910.850836]  ffff88017fc0ec40 ffff88017ab7bda0 ffffffff81909370
000000010008feaa
[  910.859118] Call Trace:
[  910.861852]  [<ffffffff81909370>] schedule+0x30/0x80
[  910.867408]  [<ffffffff8190c3b9>] schedule_timeout+0x209/0x410
[  910.873938]  [<ffffffff810b8760>] ? init_timer_key+0xa0/0xa0
[  910.880267]  [<ffffffff81097aab>] ? prepare_to_swait+0x5b/0x80
[  910.886793]  [<ffffffff810b3e09>] rcu_gp_kthread+0x479/0x800
[  910.893124]  [<ffffffff810b3990>] ? call_rcu_sched+0x20/0x20
[  910.899458]  [<ffffffff81079f54>] kthread+0xc4/0xe0
[  910.904917]  [<ffffffff8190d3cf>] ret_from_fork+0x1f/0x40
[  910.910961]  [<ffffffff81079e90>] ? kthread_worker_fn+0x160/0x160


Is it bug in the driver or somewhere else?

-- 
With Best Regards,
Andy Shevchenko

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#1453734

FromAndy Shevchenko <andy.shevchenko@gmail.com>
Date2016-08-02 12:50 +0200
Message-ID<s1FqO-3dN-3@gated-at.bofh.it>
In reply to#1453718
On Tue, Aug 2, 2016 at 1:08 PM, Andy Shevchenko
<andy.shevchenko@gmail.com> wrote:
> Hi!
>
> I'm trying to use mmio tracer with recent kernels (in this particular
> case today's linux-next).

Additional info. I took v4.4.16 and add the following to the default
x86_64_defconfig:
+CONFIG_MMIOTRACE=y
+CONFIG_SERIAL_8250_DW=y
+CONFIG_MFD_INTEL_LPSS=y
+CONFIG_MFD_INTEL_LPSS_PCI=y

The problem is still reproduced.
I can't take earlier kernels because the mentioned driver (intel-lpss)
was introduced in v4.4.

-- 
With Best Regards,
Andy Shevchenko

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#1454678

FromAndy Shevchenko <andy.shevchenko@gmail.com>
Date2016-08-02 17:10 +0200
Message-ID<s1Jup-68b-5@gated-at.bofh.it>
In reply to#1453718
+Cc: Karol, Ingo

On Tue, Aug 2, 2016 at 1:08 PM, Andy Shevchenko
<andy.shevchenko@gmail.com> wrote:
> Hi!
>
> I'm trying to use mmio tracer with recent kernels (in this particular
> case today's linux-next).

Tested on other board and found that v4.5 works while v4.5.7 doesn't.
Bisecting to

commit d62a28a60562a8ba82e67e13c268245f37e796cb
Author: Karol Herbst <nouveau@karolherbst.de>
Date:   Thu Mar 3 02:03:11 2016 +0100

    x86/mm/kmmio: Fix mmiotrace for hugepages

    commit cfa52c0cfa4d727aa3e457bf29aeff296c528a08 upstream.

Reverting _helps_ for x86 and x86_64 builds.

>
> # mount -t debugfs none /sys/kernel/debug/
>
> # echo mmiotrace > /sys/kernel/debug/tracing/current_tracer
> [  869.673145] in mmio_trace_init
> [  869.714170] mmiotrace: Disabling non-boot CPUs...
> [  869.729938] Cannot set affinity for irq 169
> [  869.735765] smpboot: CPU 1 is now offline
> [  869.746662] mmiotrace: CPU1 is down.
> [  869.757896] smpboot: CPU 2 is now offline
> [  869.773572] mmiotrace: CPU2 is down.
> [  869.781768] smpboot: CPU 3 is now offline
> [  869.789495] mmiotrace: CPU3 is down.
> [  869.793515] mmiotrace: enabled.
>
> #  echo 1 > /sys/kernel/debug/tracing/tracing_on
> [  869.802634] in mmio_trace_start
>
> # echo 0000:00:18.1 > /sys/bus/pci/drivers/intel-lpss/unbind
> [  883.625744] mmiotrace: Unmapping ffffc90000854000.
> [  883.633925] mmiotrace: Unmapping ffffc90000852000.
> [  883.644580] mmiotrace: Unmapping ffffc90000850000.
>
> # echo 0000:00:18.1 > /sys/bus/pci/drivers/intel-lpss/bind
> [  889.525125] mmiotrace: ioremap_*(0x9242e200, 0x100) = ffffc90000856200
>
> [  910.533911] INFO: rcu_sched detected stalls on CPUs/tasks:
> [  910.540052]  (detected by 0, t=21002 jiffies, g=348, c=347, q=0)
> [  910.546790] All QSes seen, last rcu_sched kthread activity 21002
> (4295577777-4295556775), jiffies_till_next_fqs=3, root ->qsm
> ask 0x0
> [  910.560142] sh              R  running task    12336  1289      1 0x20020008
> [  910.568055]  ffffffff81e422c0 ffff88017fc03e20 ffffffff81085296
> ffff88017fc18500
> [  910.576366]  ffffffff81e422c0 ffff88017fc03e88 ffffffff810b547d
> 0000000000000000
> [  910.584675]  ffffffff810f67ec 000000000000015c 0000000000000000
> 000000000000015c
> [  910.592980] Call Trace:
> [  910.595715]  <IRQ>  [<ffffffff81085296>] sched_show_task+0xb6/0x110
> [  910.602748]  [<ffffffff810b547d>] rcu_check_callbacks+0x84d/0x850
> [  910.609573]  [<ffffffff810f67ec>] ? __acct_update_integrals+0x2c/0xb0
> [  910.616788]  [<ffffffff810c9150>] ? tick_sched_do_timer+0x30/0x30
> [  910.623613]  [<ffffffff810ba34a>] update_process_times+0x2a/0x50
> [  910.630343]  [<ffffffff810c8bb1>] tick_sched_handle.isra.12+0x31/0x40
> [  910.637560]  [<ffffffff810c9188>] tick_sched_timer+0x38/0x70
> [  910.643902]  [<ffffffff810bacba>] __hrtimer_run_queues+0xda/0x250
> [  910.650734]  [<ffffffff810bb3f3>] hrtimer_interrupt+0xa3/0x190
> [  910.657272]  [<ffffffff8103ead3>] local_apic_timer_interrupt+0x33/0x50
> [  910.664584]  [<ffffffff8103f588>] smp_apic_timer_interrupt+0x38/0x50
> [  910.671705]  [<ffffffff8190dd6f>] apic_timer_interrupt+0x7f/0x90
> [  910.678427]  <EOI>  [<ffffffff814a717f>] ? intel_lpss_probe+0x7f/0x5f0
> [  910.685739]  [<ffffffff814a716b>] ? intel_lpss_probe+0x6b/0x5f0
> [  910.692364]  [<ffffffff8170e5df>] ? raw_pci_write+0x1f/0x40
> [  910.698610]  [<ffffffff8136e825>] ? pci_bus_write_config_byte+0x55/0x70
> [  910.706022]  [<ffffffff813781b1>] ? pcibios_set_master+0x51/0x80
> [  910.712753]  [<ffffffff814a7836>] intel_lpss_pci_probe+0x76/0xb0
> [  910.719479]  [<ffffffff813797e0>] local_pci_probe+0x40/0xa0
> [  910.725719]  [<ffffffff811fce44>] ? sysfs_do_create_link_sd.isra.2+0x64/0xa0
> [  910.733617]  [<ffffffff8137ab46>] pci_device_probe+0xd6/0x120
> [  910.740058]  [<ffffffff8148679f>] driver_probe_device+0x21f/0x430
> [  910.746883]  [<ffffffff81484c4f>] bind_store+0x10f/0x160
> [  910.752836]  [<ffffffff81484150>] drv_attr_store+0x20/0x30
> [  910.758983]  [<ffffffff811fc312>] sysfs_kf_write+0x32/0x40
> [  910.765129]  [<ffffffff811fb863>] kernfs_fop_write+0x113/0x190
> [  910.771663]  [<ffffffff81185343>] __vfs_write+0x23/0x120
> [  910.777607]  [<ffffffff812cfd46>] ? security_file_permission+0x36/0xb0
> [  910.784918]  [<ffffffff810998dd>] ? percpu_down_read+0xd/0x50
> [  910.791351]  [<ffffffff81186403>] vfs_write+0xb3/0x1b0
> [  910.797103]  [<ffffffff81187711>] SyS_write+0x41/0xa0
> [  910.802758]  [<ffffffff81002b2e>] do_int80_syscall_32+0x4e/0xa0
> [  910.809389]  [<ffffffff8190f2aa>] entry_INT80_compat+0x2a/0x40
> [  910.815925] rcu_sched kthread starved for 21002 jiffies! g348 c347
> f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0
> [  910.826351] rcu_sched       R  running task    14896     7      2 0x00000000
> [  910.834260]  ffff88017ab7bd88 ffff880179c17080 ffff88017ab34b00
> 0000000000000000
> [  910.842550]  ffff88017ab7c000 ffff88017ab7bdd0 00000000ffffffff
> 0000000000000000
> [  910.850836]  ffff88017fc0ec40 ffff88017ab7bda0 ffffffff81909370
> 000000010008feaa
> [  910.859118] Call Trace:
> [  910.861852]  [<ffffffff81909370>] schedule+0x30/0x80
> [  910.867408]  [<ffffffff8190c3b9>] schedule_timeout+0x209/0x410
> [  910.873938]  [<ffffffff810b8760>] ? init_timer_key+0xa0/0xa0
> [  910.880267]  [<ffffffff81097aab>] ? prepare_to_swait+0x5b/0x80
> [  910.886793]  [<ffffffff810b3e09>] rcu_gp_kthread+0x479/0x800
> [  910.893124]  [<ffffffff810b3990>] ? call_rcu_sched+0x20/0x20
> [  910.899458]  [<ffffffff81079f54>] kthread+0xc4/0xe0
> [  910.904917]  [<ffffffff8190d3cf>] ret_from_fork+0x1f/0x40
> [  910.910961]  [<ffffffff81079e90>] ? kthread_worker_fn+0x160/0x160
>
>
> Is it bug in the driver or somewhere else?
>
> --
> With Best Regards,
> Andy Shevchenko



-- 
With Best Regards,
Andy Shevchenko

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#1454698

FromAndy Shevchenko <andy.shevchenko@gmail.com>
Date2016-08-02 17:10 +0200
Message-ID<s1Jur-68b-51@gated-at.bofh.it>
In reply to#1454678
Use another Karol's address (found in MAINTAINERS)

On Tue, Aug 2, 2016 at 6:05 PM, Andy Shevchenko
<andy.shevchenko@gmail.com> wrote:
> +Cc: Karol, Ingo
>
> On Tue, Aug 2, 2016 at 1:08 PM, Andy Shevchenko
> <andy.shevchenko@gmail.com> wrote:
>> Hi!
>>
>> I'm trying to use mmio tracer with recent kernels (in this particular
>> case today's linux-next).
>
> Tested on other board and found that v4.5 works while v4.5.7 doesn't.
> Bisecting to
>
> commit d62a28a60562a8ba82e67e13c268245f37e796cb
> Author: Karol Herbst <nouveau@karolherbst.de>
> Date:   Thu Mar 3 02:03:11 2016 +0100
>
>     x86/mm/kmmio: Fix mmiotrace for hugepages
>
>     commit cfa52c0cfa4d727aa3e457bf29aeff296c528a08 upstream.
>
> Reverting _helps_ for x86 and x86_64 builds.
>
>>
>> # mount -t debugfs none /sys/kernel/debug/
>>
>> # echo mmiotrace > /sys/kernel/debug/tracing/current_tracer
>> [  869.673145] in mmio_trace_init
>> [  869.714170] mmiotrace: Disabling non-boot CPUs...
>> [  869.729938] Cannot set affinity for irq 169
>> [  869.735765] smpboot: CPU 1 is now offline
>> [  869.746662] mmiotrace: CPU1 is down.
>> [  869.757896] smpboot: CPU 2 is now offline
>> [  869.773572] mmiotrace: CPU2 is down.
>> [  869.781768] smpboot: CPU 3 is now offline
>> [  869.789495] mmiotrace: CPU3 is down.
>> [  869.793515] mmiotrace: enabled.
>>
>> #  echo 1 > /sys/kernel/debug/tracing/tracing_on
>> [  869.802634] in mmio_trace_start
>>
>> # echo 0000:00:18.1 > /sys/bus/pci/drivers/intel-lpss/unbind
>> [  883.625744] mmiotrace: Unmapping ffffc90000854000.
>> [  883.633925] mmiotrace: Unmapping ffffc90000852000.
>> [  883.644580] mmiotrace: Unmapping ffffc90000850000.
>>
>> # echo 0000:00:18.1 > /sys/bus/pci/drivers/intel-lpss/bind
>> [  889.525125] mmiotrace: ioremap_*(0x9242e200, 0x100) = ffffc90000856200
>>
>> [  910.533911] INFO: rcu_sched detected stalls on CPUs/tasks:
>> [  910.540052]  (detected by 0, t=21002 jiffies, g=348, c=347, q=0)
>> [  910.546790] All QSes seen, last rcu_sched kthread activity 21002
>> (4295577777-4295556775), jiffies_till_next_fqs=3, root ->qsm
>> ask 0x0
>> [  910.560142] sh              R  running task    12336  1289      1 0x20020008
>> [  910.568055]  ffffffff81e422c0 ffff88017fc03e20 ffffffff81085296
>> ffff88017fc18500
>> [  910.576366]  ffffffff81e422c0 ffff88017fc03e88 ffffffff810b547d
>> 0000000000000000
>> [  910.584675]  ffffffff810f67ec 000000000000015c 0000000000000000
>> 000000000000015c
>> [  910.592980] Call Trace:
>> [  910.595715]  <IRQ>  [<ffffffff81085296>] sched_show_task+0xb6/0x110
>> [  910.602748]  [<ffffffff810b547d>] rcu_check_callbacks+0x84d/0x850
>> [  910.609573]  [<ffffffff810f67ec>] ? __acct_update_integrals+0x2c/0xb0
>> [  910.616788]  [<ffffffff810c9150>] ? tick_sched_do_timer+0x30/0x30
>> [  910.623613]  [<ffffffff810ba34a>] update_process_times+0x2a/0x50
>> [  910.630343]  [<ffffffff810c8bb1>] tick_sched_handle.isra.12+0x31/0x40
>> [  910.637560]  [<ffffffff810c9188>] tick_sched_timer+0x38/0x70
>> [  910.643902]  [<ffffffff810bacba>] __hrtimer_run_queues+0xda/0x250
>> [  910.650734]  [<ffffffff810bb3f3>] hrtimer_interrupt+0xa3/0x190
>> [  910.657272]  [<ffffffff8103ead3>] local_apic_timer_interrupt+0x33/0x50
>> [  910.664584]  [<ffffffff8103f588>] smp_apic_timer_interrupt+0x38/0x50
>> [  910.671705]  [<ffffffff8190dd6f>] apic_timer_interrupt+0x7f/0x90
>> [  910.678427]  <EOI>  [<ffffffff814a717f>] ? intel_lpss_probe+0x7f/0x5f0
>> [  910.685739]  [<ffffffff814a716b>] ? intel_lpss_probe+0x6b/0x5f0
>> [  910.692364]  [<ffffffff8170e5df>] ? raw_pci_write+0x1f/0x40
>> [  910.698610]  [<ffffffff8136e825>] ? pci_bus_write_config_byte+0x55/0x70
>> [  910.706022]  [<ffffffff813781b1>] ? pcibios_set_master+0x51/0x80
>> [  910.712753]  [<ffffffff814a7836>] intel_lpss_pci_probe+0x76/0xb0
>> [  910.719479]  [<ffffffff813797e0>] local_pci_probe+0x40/0xa0
>> [  910.725719]  [<ffffffff811fce44>] ? sysfs_do_create_link_sd.isra.2+0x64/0xa0
>> [  910.733617]  [<ffffffff8137ab46>] pci_device_probe+0xd6/0x120
>> [  910.740058]  [<ffffffff8148679f>] driver_probe_device+0x21f/0x430
>> [  910.746883]  [<ffffffff81484c4f>] bind_store+0x10f/0x160
>> [  910.752836]  [<ffffffff81484150>] drv_attr_store+0x20/0x30
>> [  910.758983]  [<ffffffff811fc312>] sysfs_kf_write+0x32/0x40
>> [  910.765129]  [<ffffffff811fb863>] kernfs_fop_write+0x113/0x190
>> [  910.771663]  [<ffffffff81185343>] __vfs_write+0x23/0x120
>> [  910.777607]  [<ffffffff812cfd46>] ? security_file_permission+0x36/0xb0
>> [  910.784918]  [<ffffffff810998dd>] ? percpu_down_read+0xd/0x50
>> [  910.791351]  [<ffffffff81186403>] vfs_write+0xb3/0x1b0
>> [  910.797103]  [<ffffffff81187711>] SyS_write+0x41/0xa0
>> [  910.802758]  [<ffffffff81002b2e>] do_int80_syscall_32+0x4e/0xa0
>> [  910.809389]  [<ffffffff8190f2aa>] entry_INT80_compat+0x2a/0x40
>> [  910.815925] rcu_sched kthread starved for 21002 jiffies! g348 c347
>> f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0
>> [  910.826351] rcu_sched       R  running task    14896     7      2 0x00000000
>> [  910.834260]  ffff88017ab7bd88 ffff880179c17080 ffff88017ab34b00
>> 0000000000000000
>> [  910.842550]  ffff88017ab7c000 ffff88017ab7bdd0 00000000ffffffff
>> 0000000000000000
>> [  910.850836]  ffff88017fc0ec40 ffff88017ab7bda0 ffffffff81909370
>> 000000010008feaa
>> [  910.859118] Call Trace:
>> [  910.861852]  [<ffffffff81909370>] schedule+0x30/0x80
>> [  910.867408]  [<ffffffff8190c3b9>] schedule_timeout+0x209/0x410
>> [  910.873938]  [<ffffffff810b8760>] ? init_timer_key+0xa0/0xa0
>> [  910.880267]  [<ffffffff81097aab>] ? prepare_to_swait+0x5b/0x80
>> [  910.886793]  [<ffffffff810b3e09>] rcu_gp_kthread+0x479/0x800
>> [  910.893124]  [<ffffffff810b3990>] ? call_rcu_sched+0x20/0x20
>> [  910.899458]  [<ffffffff81079f54>] kthread+0xc4/0xe0
>> [  910.904917]  [<ffffffff8190d3cf>] ret_from_fork+0x1f/0x40
>> [  910.910961]  [<ffffffff81079e90>] ? kthread_worker_fn+0x160/0x160
>>
>>
>> Is it bug in the driver or somewhere else?
>>
>> --
>> With Best Regards,
>> Andy Shevchenko
>
>
>
> --
> With Best Regards,
> Andy Shevchenko



-- 
With Best Regards,
Andy Shevchenko

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#1454781

FromSteven Rostedt <rostedt@goodmis.org>
Date2016-08-02 17:40 +0200
Message-ID<s1JXr-6lC-19@gated-at.bofh.it>
In reply to#1454698
On Tue, 2 Aug 2016 18:07:38 +0300
Andy Shevchenko <andy.shevchenko@gmail.com> wrote:

> Use another Karol's address (found in MAINTAINERS)
> 
> On Tue, Aug 2, 2016 at 6:05 PM, Andy Shevchenko
> <andy.shevchenko@gmail.com> wrote:
> > +Cc: Karol, Ingo
> >
> > On Tue, Aug 2, 2016 at 1:08 PM, Andy Shevchenko
> > <andy.shevchenko@gmail.com> wrote:  
> >> Hi!
> >>
> >> I'm trying to use mmio tracer with recent kernels (in this particular
> >> case today's linux-next).  
> >
> > Tested on other board and found that v4.5 works while v4.5.7 doesn't.
> > Bisecting to
> >
> > commit d62a28a60562a8ba82e67e13c268245f37e796cb
> > Author: Karol Herbst <nouveau@karolherbst.de>
> > Date:   Thu Mar 3 02:03:11 2016 +0100
> >
> >     x86/mm/kmmio: Fix mmiotrace for hugepages
> >
> >     commit cfa52c0cfa4d727aa3e457bf29aeff296c528a08 upstream.
> >
> > Reverting _helps_ for x86 and x86_64 builds.
> >  

That commit was added in 4.6. Does that kernel work? Maybe it was a bad
backport?

-- Steve

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#1454893

FromSteven Rostedt <rostedt@goodmis.org>
Date2016-08-02 18:20 +0200
Message-ID<s1KAa-6OZ-17@gated-at.bofh.it>
In reply to#1454781
On Tue, 2 Aug 2016 19:08:24 +0300
Andy Shevchenko <andy.shevchenko@gmail.com> wrote:

> I don't think so, since linux-next doesn't work until I revert this commit.
> 
> I can try exactly v4.6 (yep, I tried stable versions, including
> v4.4.16 that's why all of them failed to me) if you still would like
> me to do so.

If linux-next doesn't work, then don't bother.

That commit obviously broke something and you'll probably need help
from Karol to fix it.

Thanks,

-- Steve

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#1455951

Fromkarol herbst <karolherbst@gmail.com>
Date2016-08-03 20:40 +0200
Message-ID<s29fb-6dM-15@gated-at.bofh.it>
In reply to#1454893
hi all,

mhhh exactly this commit fixed mmiotrace for me and a few other
nouveau devs on x86_64.

Also the error log doesn't really show a problem inside the tracer?
Maybe it would be helpful to provide full dmesg in the case of error,
just to rule silly things out.

I will try to figure out how that bug could happen at all.

Greetings

Karol

2016-08-02 18:13 GMT+02:00 Steven Rostedt <rostedt@goodmis.org>:
> On Tue, 2 Aug 2016 19:08:24 +0300
> Andy Shevchenko <andy.shevchenko@gmail.com> wrote:
>
>> I don't think so, since linux-next doesn't work until I revert this commit.
>>
>> I can try exactly v4.6 (yep, I tried stable versions, including
>> v4.4.16 that's why all of them failed to me) if you still would like
>> me to do so.
>
> If linux-next doesn't work, then don't bother.
>
> That commit obviously broke something and you'll probably need help
> from Karol to fix it.
>
> Thanks,
>
> -- Steve

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#1454924

FromAndy Shevchenko <andy.shevchenko@gmail.com>
Date2016-08-02 18:30 +0200
Message-ID<s1KAa-6OZ-19@gated-at.bofh.it>
In reply to#1454781
On Tue, Aug 2, 2016 at 6:31 PM, Steven Rostedt <rostedt@goodmis.org> wrote:
> On Tue, 2 Aug 2016 18:07:38 +0300
> Andy Shevchenko <andy.shevchenko@gmail.com> wrote:
>
>> Use another Karol's address (found in MAINTAINERS)
>>
>> On Tue, Aug 2, 2016 at 6:05 PM, Andy Shevchenko
>> <andy.shevchenko@gmail.com> wrote:
>> > +Cc: Karol, Ingo
>> >
>> > On Tue, Aug 2, 2016 at 1:08 PM, Andy Shevchenko
>> > <andy.shevchenko@gmail.com> wrote:
>> >> Hi!
>> >>
>> >> I'm trying to use mmio tracer with recent kernels (in this particular
>> >> case today's linux-next).
>> >
>> > Tested on other board and found that v4.5 works while v4.5.7 doesn't.
>> > Bisecting to
>> >
>> > commit d62a28a60562a8ba82e67e13c268245f37e796cb
>> > Author: Karol Herbst <nouveau@karolherbst.de>
>> > Date:   Thu Mar 3 02:03:11 2016 +0100
>> >
>> >     x86/mm/kmmio: Fix mmiotrace for hugepages
>> >
>> >     commit cfa52c0cfa4d727aa3e457bf29aeff296c528a08 upstream.
>> >
>> > Reverting _helps_ for x86 and x86_64 builds.
>> >
>
> That commit was added in 4.6. Does that kernel work? Maybe it was a bad
> backport?

I don't think so, since linux-next doesn't work until I revert this commit.

I can try exactly v4.6 (yep, I tried stable versions, including
v4.4.16 that's why all of them failed to me) if you still would like
me to do so.


-- 
With Best Regards,
Andy Shevchenko

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