Kernel panic in Power Management on Samsung Arndale board with Linux Linaro ubuntu image.

[Botao]

On Samsung Arndale board with Linux Linaro ubuntu Quantal image:

http://snapshots.linaro.org/quantal/pre-built/arndale/249/arndale-quantal_server_20130217-249.img.gz

When run power management test, kernel panic happens. The procedure list is:

# apt-get install bzr python-apt python-setuptools
# bzr branch lp:lava-test
# cd lava-test
# python setup.py install
# lava-test install pwrmgmt
# lava-test run pwrmgmt

Please refer to attachment to get full serial log output.

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This issue is observed on following images:
http://snapshots.linaro.org/quantal/pre-built/arndale/249/arndale-quantal_server_20130217-249.img.gz
http://snapshots.linaro.org/quantal/pre-built/arndale/256/arndale-quantal_server_20130224-256.img.gz
http://snapshots.linaro.org/quantal/pre-built/arndale/280/arndale-quantal_server_20130401-280.img.gz
http://snapshots.linaro.org/quantal/pre-built/arndale/286/arndale-quantal_server_20130408-286.img.gz
http://snapshots.linaro.org/quantal/pre-built/arndale/290/arndale-quantal_server_20130414-290.img.gz
http://snapshots.linaro.org/quantal/pre-built/arndale/299/arndale-quantal_server_20130423-299.img.gz
http://snapshots.linaro.org/raring/hwpacks/arndale/323/hwpack_linaro-arndale_20130508-323_armhf_supported.tar.gz and http://snapshots.linaro.org/raring/images/server/359/linaro-raring-server-20130507-359.tar.gz
http://snapshots.linaro.org/ubuntu/pre-built/arndale/344/arndale-raring_server_20130526-344.img.gz

[Botao (botao-sun)]

On Samsung Arndale board with Linux Linaro ubuntu image:

http://snapshots.linaro.org/quantal/pre-built/arndale/269/arndale-quantal_server_20130315-269.img.gz

Kernel panic has gone during the power management test, but still some failed test cases got observed. Also, after ran test case "thermal_05.0", system hangs. Please refer to attachment to get detailed test result.

[Botao (botao-sun)]

On Samsung Arndale board with Linux Linaro ubuntu image:

http://snapshots.linaro.org/quantal/pre-built/arndale/276/arndale-quantal_server_20130324-276.img.gz

Kernel panic shows up again, with some other failures. Please refer to attachment to get full test result output.

[Amit Kucheria (amitk)]

Marking invalid for PM-QA. This seems to be hotplug-related problem with Arndale. Samsung LT needs to investigate.

[Inderpal Singh (ips)]

The kernel panic can be fixed with patch:

https://patchwork.kernel.org/patch/2400391/

[Fathi Boudra (fboudra)]

Hot-plugging with CONFIG_DEBUG_PREEMPT=y on a device with arm
architected timers causes a slew of "using smp_processor_id() in
preemptible" warnings:

  BUG: using smp_processor_id() in preemptible [00000000] code: sh/111
  caller is arch_timer_cpu_notify+0x14/0xc8

This happens because sometimes the cpu notifier,
arch_timer_cpu_notify(), is called in preemptible context and
other times in non-preemptible context but we use this_cpu_ptr()
to retrieve the clockevent in all cases. We're only going to
actually use the pointer in non-preemptible context though, so
push the this_cpu_ptr() access down into the cases to force the
checks to occur only in non-preemptible contexts.

[Tushar Behera (tusharbehera)]

CPU hotplug is still an issue on Arndale. LT is working on fixing this.

[Inderpal Singh (ips)]

The hotplug issue happens because u-boot commit "3d28a181aab5e... arndale5250: Boot in Hyp
mode and enable architected timers" puts the CPUs in HYP mode. Same needs to be done in hotplug case.

The attached patch fixes the issue.

[Tushar Behera (tusharbehera)]

Should be fixed with next rebuild of linux-linaro tree. Tested locally to be working fine.

[Botao (botao-sun)]

On Samsung Arndale board with Linux Linaro ubuntu Raring image:

http://snapshots.linaro.org/raring/pre-built/arndale/336/arndale-raring_server_20130520-336.img.gz

Kernel panic has gone, please refer to attachment to get full test result output.

However, there are some errors related to CPU hot plug, and a new bug has been rasied for that:

https://bugs.launchpad.net/linaro-ubuntu/+bug/1182848