linux-kernel - Re: [PATCH v3 0/6] notifier error injection

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Date:	Tue, 2 Aug 2011 16:35:05 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	Pavel Machek <pavel@....cz>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH v3 0/6] notifier error injection

2011/8/1 Pavel Machek <pavel@....cz>:
> Hi!
>
>> This provides kernel modules that can be used to test the error handling
>> of notifier call chain failures by injecting artifical errors to the
>> following notifier chain callbacks.
>>
>>  * CPU notifier
>>  * PM notifier
>>  * memory hotplug notifier
>>  * powerpc pSeries reconfig notifier
> ...
>
>>  11 files changed, 680 insertions(+), 38 deletions(-)
>
> Do we really need this debugging code in mainline? How many bugs did
> it find?

I'm seeing a memory hotplug related bug but it also can be reproducible
without this feature.  Repeatedly online/offline memory with attached
memory-hotplug.sh under disk activity like kernel build can easily cause
Oopses.

Aside from that, I didn't find any bugs but I still think this feature is
useful for testing and it just add a little complexity to exiting code.
(Maybe I need to prove it by finding more bugs)

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