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Date: Mon, 22 Apr 2024 06:35:58 -0700
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Subject: Re: [PATCH v3 7/7] kunit: Add tests for fault
To: =?UTF-8?Q?Micka=C3=ABl_Sala=C3=BCn?= <mic@digikod.net>,
 David Gow <davidgow@google.com>
Cc: Brendan Higgins <brendanhiggins@google.com>, Rae Moar <rmoar@google.com>,
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From: Guenter Roeck <linux@roeck-us.net>
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In-Reply-To: <20240422.thesh7quoo0U@digikod.net>
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On 4/22/24 06:08, Mickaël Salaün wrote:
> On Fri, Apr 19, 2024 at 04:38:01PM -0700, Guenter Roeck wrote:
>> On Fri, Apr 19, 2024 at 03:33:49PM -0700, Guenter Roeck wrote:
>>> Hi,
>>>
>>> On Tue, Mar 19, 2024 at 11:48:57AM +0100, Mickaël Salaün wrote:
>>>> Add a test case to check NULL pointer dereference and make sure it would
>>>> result as a failed test.
>>>>
>>>> The full kunit_fault test suite is marked as skipped when run on UML
>>>> because it would result to a kernel panic.
>>>>
>>>> Tested with:
>>>> ./tools/testing/kunit/kunit.py run --arch x86_64 kunit_fault
>>>> ./tools/testing/kunit/kunit.py run --arch arm64 \
>>>>    --cross_compile=aarch64-linux-gnu- kunit_fault
>>>>
>>>
>>> What is the rationale for adding those tests unconditionally whenever
>>> CONFIG_KUNIT_TEST is enabled ? This completely messes up my test system
>>> because it concludes that it is pointless to continue testing
>>> after the "Unable to handle kernel NULL pointer dereference" backtrace.
>>> At the same time, it is all or nothing, meaning I can not disable
>>> it but still run other kunit tests.
>>>
> 
> CONFIG_KUNIT_TEST is to test KUnit itself.  Why does this messes up your
> test system, and what is your test system?  Is it related to the kernel
> warning and then the message you previously sent?

It is not a warning, it is a BUG which terminates the affected kernel thread.
NULL pointer dereferences are normally fatal, which is why I abort tests
if one is encountered. I am not going to start introducing code into my
scripts to ignore such warnings (or BUG messages) on a case by case basis;
this would be unmaintainable.

> https://lore.kernel.org/r/fd604ae0-5630-4745-acf2-1e51c69cf0c0@roeck-us.net
> It seems David has a solution to suppress such warning.
> 

I don't think so. My series tried to suppress warning backtraces, not BUG
messages. BUG messages can not easily be suppressed since the reaction is
architecture specific and typically fatal.

As I said below, never mind, I just disabled CONFIG_KUNIT_TEST in my testing.

Guenter

>>
>> Oh, never mind. I just disabled CONFIG_KUNIT_TEST in my test bed
>> to "solve" the problem. I'll take that as one of those "unintended
>> consequences" items: Instead of more tests, there are fewer.
>>
>> Guenter
>>