Bug#855183: linux-image-4.9.0-0.bpo.1-amd64: modprobe intel_rapl_perf stay in uninterruptible sleep

From	Miloslav Hůla <miloslav.hula@gmail.com>
Newsgroups	linux.debian.bugs.dist, linux.kernel, linux.debian.kernel
Subject	Bug#855183: linux-image-4.9.0-0.bpo.1-amd64: modprobe intel_rapl_perf stay in uninterruptible sleep
Date	2017-02-20 23:40 +0100
Message-ID	<td4MF-2a7-1@gated-at.bofh.it> (permalink)
References	<tb2YF-5LQ-11@gated-at.bofh.it> <tbF3X-5xt-1@gated-at.bofh.it> <tbOqC-3eL-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 3 groups.

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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.

King redards, Miloslav

Thread

Bug#855183: linux-image-4.9.0-0.bpo.1-amd64: modprobe intel_rapl_perf stay in uninterruptible sleep Ben Hutchings <ben@decadent.org.uk> - 2017-02-17 02:00 +0100
  Bug#855183: linux-image-4.9.0-0.bpo.1-amd64: modprobe intel_rapl_perf stay in uninterruptible sleep Thomas Gleixner <tglx@linutronix.de> - 2017-02-17 12:00 +0100
    Bug#855183: linux-image-4.9.0-0.bpo.1-amd64: modprobe intel_rapl_perf stay in uninterruptible sleep Miloslav Hůla <miloslav.hula@gmail.com> - 2017-02-20 23:40 +0100
      Bug#855183: linux-image-4.9.0-0.bpo.1-amd64: modprobe intel_rapl_perf stay in uninterruptible sleep Thomas Gleixner <tglx@linutronix.de> - 2017-02-21 00:30 +0100
        Bug#855183: linux-image-4.9.0-0.bpo.1-amd64: modprobe intel_rapl_perf stay in uninterruptible sleep Miloslav Hůla <miloslav.hula@gmail.com> - 2017-02-21 10:20 +0100

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