linux-kernel - Re: How to debug DEBUG_TEST_DRIVER_REMOVE hang during loading of kernel?

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Date:   Fri, 4 Nov 2016 21:47:10 +0100
From:   Maarten Maathuis <madman2003@...il.com>
To:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: How to debug DEBUG_TEST_DRIVER_REMOVE hang during loading of kernel?

Anyone have advice where else I can ask?

On Sat, Oct 29, 2016 at 1:07 PM, Maarten Maathuis <madman2003@...il.com> wrote:
> Anyone have suggestions?
>
> On Thu, Oct 27, 2016 at 8:42 PM, Maarten Maathuis <madman2003@...il.com> wrote:
>> Hi,
>>
>> I recently had trouble with loading a 4.9rcX kernel, which was hanging
>> after loading the initial kernel ramdisk. After some painful bisecting
>> I found this:
>>
>> bea5b158ff0da9c7246ff391f754f5f38e34577a is the first bad commit
>> commit bea5b158ff0da9c7246ff391f754f5f38e34577a
>> Author: Rob Herring <robh@...nel.org>
>> Date:   Thu Aug 11 10:20:58 2016 -0500
>>
>>     driver core: add test of driver remove calls during probe
>>
>>     In recent discussions on ksummit-discuss[1], it was suggested to do a
>>     sequence of probe, remove, probe for testing driver remove paths. This
>>     adds a kconfig option for said test.
>>
>>     [1] https://lists.linuxfoundation.org/pipermail/ksummit-discuss/2016-August/003459.html
>>
>>     Suggested-by: Arnd Bergmann <arnd@...db.de>
>>     Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>>     Signed-off-by: Rob Herring <robh@...nel.org>
>>     Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>>
>> It turns out that the package i was using to build the kernel had
>> DEBUG_TEST_DRIVER_REMOVE enabled.
>>
>> How do I actually figure out why this test causes a hang. I don't have
>> a COM port available to use as serial console, and i don't know if it
>> would even help.
>>
>> Please CC me as i'm not a member of this mailinglist.
>>
>> Maarten.
>>
>> --
>> Far away from the primal instinct, the song seems to fade away, the
>> river get wider between your thoughts and the things we do and say.
>
>
>
> --
> Far away from the primal instinct, the song seems to fade away, the
> river get wider between your thoughts and the things we do and say.



-- 
Far away from the primal instinct, the song seems to fade away, the
river get wider between your thoughts and the things we do and say.