Re: [Linux v4.10.0-rc1] call-traces after suspend-resume (pm? i915? cpu/hotplug?)

["Rafael J. Wysocki" <rafael@kernel.org>]

On Wed, Dec 28, 2016 at 11:00 AM, Sedat Dilek <sedat.dilek@gmail.com> wrote:
> On Wed, Dec 28, 2016 at 9:29 AM, Jani Nikula <jani.nikula@intel.com> wrote:
>> On Wed, 28 Dec 2016, Sedat Dilek <sedat.dilek@gmail.com> wrote:
>>> On Tue, Dec 27, 2016 at 10:13 PM, Pavel Machek <pavel@ucw.cz> wrote:
>>>> Hi!
>>>>
>>>>> [ Add some pm | i915 | x86 folks ]
>>>>>
>>>>> Hi,
>>>>>
>>>>> I have built Linux v4.10-rc1 today on my Ubuntu/precise AMD64 system
>>>>> and I see some call-traces.
>>>>> It is reproducible on suspend and resume.
>>>>>
>>>>> I cannot say which area touches the problem or if these are several
>>>>> independent problems.
>>>>>
>>>>> For a full dmesg-log see attachments (my linux-config is attached, too).
>>>>>
>>>>> Here some hunks...
>>>>>
>>>>> [   29.003601] BUG: sleeping function called from invalid context at
>>>>> drivers/base/power/runtime.c:1032
>>>>> [   29.003608] in_atomic(): 1, irqs_disabled(): 0, pid: 1469, name: Xorg
>>>>> [   29.003610] 1 lock held by Xorg/1469:
>>>>> [   29.003611]  #0:  (&dev->struct_mutex){+.+.+.}, at:
>>>>> [<ffffffffa0623c13>] i915_mutex_lock_interruptible+0x43/0x140 [i915]
>>>>> [   29.003653] CPU: 0 PID: 1469 Comm: Xorg Not tainted
>>>>> 4.10.0-rc1-1-iniza-small #1
>>>>> [   29.003655] Hardware name: SAMSUNG ELECTRONICS CO., LTD.
>>>>> 530U3BI/530U4BI/530U4BH/530U3BI/530U4BI/530U4BH, BIOS 13XK 03/28/2013
>>>>> [   29.003656] Call Trace:
>>>>
>>>> Just a note, at least 2 machines here refuse to resume with
>>>> v4.10-rc1. One has intel graphics, one has AMD. It may or may not have
>>>> common cause...
>>>>
>>>
>>> [ Correct linux-pm ML and add Mika & Jani ]
>>>
>>> Thanks for the feedback.
>>>
>>> There are some cpu/hotplug fixes post-v4.10-rc1.
>>> Give that a try.
>>>
>>> Yesterday, after answers from drm-intel folks I have seen that a
>>> cpu/hotplug commit [1] was reverted in
>>> drm-intel.git#drm-intel-nightly.
>>> I haven't tried that.
>>>
>>> It's good when Thomas knows of this and gets in contact with drm-intel folks.
>>>
>>> Regards,
>>> - Sedat -
>>>
>>> [1] https://cgit.freedesktop.org/drm-intel/commit/?h=drm-intel-nightly&id=e558f178f5390185b7324ff4b816b52c6ae3a928
>>> [2] https://cgit.freedesktop.org/drm-intel/log/?h=drm-intel-nightly
>>>
>>> P.S.: Revert "cpu/hotplug: Prevent overwriting of callbacks"
>>>
>>> This reverts commit dc280d93623927570da279e99393879dbbab39e7
>>> Author: Thomas Gleixner <tglx@linutronix.de>
>>> Date: Wed Dec 21 20:19:49 2016 +0100
>>> cpu/hotplug: Prevent overwriting of callbacks
>>>
>>> It started hanging all machines in CI s3 test:
>>> https://intel-gfx-ci.01.org/CI/igt@gem_exec_suspend@basic-s3.html
>>>
>>> Bisected-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
>>> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
>>
>> Thomas -
>>
>> Indeed, basically all of the boxes in the intel-gfx CI hang at the
>> suspend/resume test with dc280d936239 ("cpu/hotplug: Prevent overwriting
>> of callbacks"), and after the revert in the tree that feeds to the CI,
>> we're back on track.
>>
>> I found [1], was hoping to get feedback from Mika whether that helps
>> before reporting. Chris also suggested [2] as a quick fix but I don't
>> know if anyone tried that.
>>
>
> Hi Jani,
>
> I know you were not CCed in the original thread, please see [5].
>
> The patchset from Thomas you mention [1] does fix one of the problems
> I have seen, please see [6].
> With these post-v4.10-rc1 patches applied a clean revert of Revert
> "cpu/hotplug: Prevent overwriting of callbacks" is not possible.
>
> Can you give a clear statement if the quick-fix from Chris is in
> combination with the above revert or not?
> Against v4.10-rc1?
> Tested together with the patchset of Thomas?

Please test the Linus' tree from today, it should work.

Thanks,
Rafael