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From: "Miloslav Hůla" <miloslav.hula@gmail.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Ben Hutchings <ben@decadent.org.uk>,
	x86@kernel.org, 855183@bugs.debian.org,
	LKML <linux-kernel@vger.kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Kan Liang <kan.liang@intel.com>
Subject: Re: Bug#855183: linux-image-4.9.0-0.bpo.1-amd64: modprobe intel_rapl_perf stay in uninterruptible sleep
Date: Tue, 21 Feb 2017 10:10:51 +0100	[thread overview]
Message-ID: <33175c4f-c791-4b2d-8009-680a3fd8c7c4@gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.20.1702201524110.4208@nanos>

Dne 21.02.2017 v 0:24 Thomas Gleixner napsal(a):
> On Mon, 20 Feb 2017, Miloslav Hůla wrote:
>> Dne 17.02.2017 v 11:47 Thomas Gleixner napsal(a):
>>> What's really confusing is this information from the bug report:
>>>
>>> " When I changed:
>>>
>>>   Power technology:
>>>   - from Energy Efficient
>>>   - to Custom
>>>
>>>   Energy Performance BIAS Setting:
>>>   - from Balanced Performance
>>>   - to Performance
>>>
>>>   problem disappeared. systemd-udevd starts normally, module can be
>>>   normally rmmod/insmod'ed now, load is 0.07."
>>>
>>> Miloslav: Is there any chance you can try a 4.10-rc8 kernel on that
>>> machine?
>>
>> I compiled 4.10-rc8 kernel with a stock '/boot/config-4.9.0-0.bpo.1-amd64'
>> config from Debian Jessie backports. Then I reverted BIOS settings to previous
>> state and rebooted the server. Kernel and all modules loaded normally,
>> rmmod/insmod intel_rapl_perf passed normally.
>>
>> Then, without any BIOS change, I rebooted with stock 4.9.0-0.bpo.1-amd64 and
>> suprisingly, everything works, I cannot reproduce it.
>>
>> My knowledge on the field of BIOS are shallow. I don't know what I can do to
>> reproduce the bug now.
>
> Did you just reboot or go through a cold start? That might make a difference.

Reboot only. I'll test it again in next maintenance window.

Regards, Milo

      reply	other threads:[~2017-02-21  9:10 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20170215080829.27308.94177.reportbug@imap.fsv.cvut.cz>
2017-02-17  0:49 ` Bug#855183: linux-image-4.9.0-0.bpo.1-amd64: modprobe intel_rapl_perf stay in uninterruptible sleep Ben Hutchings
2017-02-17 10:47   ` Thomas Gleixner
2017-02-20 22:34     ` Miloslav Hůla
2017-02-20 23:24       ` Thomas Gleixner
2017-02-21  9:10         ` Miloslav Hůla [this message]

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