linux-kernel - Re: [PATCH v3 1/3] kasan: switch kunit tests to console tracepoints

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Date:   Tue, 12 Dec 2023 00:35:12 +0100
From:   Paul Heidekrüger <paul.heidekrueger@....de>
To:     Marco Elver <elver@...gle.com>
Cc:     Andrey Konovalov <andreyknvl@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Peter Collingbourne <pcc@...gle.com>,
        andrey.konovalov@...ux.dev,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        linux-trace-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH v3 1/3] kasan: switch kunit tests to console tracepoints

On 11.12.2023 23:56, Marco Elver wrote:
> On Mon, 11 Dec 2023 at 23:48, Paul Heidekrüger <paul.heidekrueger@....de> wrote:
> >
> > On 11.12.2023 21:51, Andrey Konovalov wrote:
> > > On Mon, Dec 11, 2023 at 7:59 PM Paul Heidekrüger
> > > <paul.heidekrueger@....de> wrote:
> > > >
> > > > > Hi Paul,
> > > > >
> > > > > I've been successfully running KASAN tests with CONFIG_TRACEPOINTS
> > > > > enabled on arm64 since this patch landed.
> > > >
> > > > Interesting ...
> > > >
> > > > > What happens when you try running the tests with .kunitconfig? Does
> > > > > CONFIG_TRACEPOINTS or CONFIG_KASAN_KUNIT_TEST get disabled during
> > > > > kernel building?
> > > >
> > > > Yes, exactly, that's what's happening.
> > > >
> > > > Here's the output kunit.py is giving me. I replaced CONFIG_DEBUG_KERNEL with
> > > > CONFIG_TRACEPOINTS in my .kunitconfig. Otherwise, it's identical with the one I
> > > > posted above.
> > > >
> > > >         ➜   ./tools/testing/kunit/kunit.py run --kunitconfig=mm/kasan/.kunitconfig --arch=arm64
> > > >         Configuring KUnit Kernel ...
> > > >         Regenerating .config ...
> > > >         Populating config with:
> > > >         $ make ARCH=arm64 O=.kunit olddefconfig
> > > >         ERROR:root:Not all Kconfig options selected in kunitconfig were in the generated .config.
> > > >         This is probably due to unsatisfied dependencies.
> > > >         Missing: CONFIG_KASAN_KUNIT_TEST=y, CONFIG_TRACEPOINTS=y
> > > >
> > > > Does CONFIG_TRACEPOINTS have some dependency I'm not seeing? I couldn't find a
> > > > reason why it would get disabled, but I could definitely be wrong.
> > >
> > > Does your .kunitconfig include CONFIG_TRACEPOINTS=y? I don't see it in
> > > the listing that you sent earlier.
> >
> > Yes. For the kunit.py output from my previous email, I replaced
> > CONFIG_DEBUG_KERNEL=y with CONFIG_TRACEPOINTS=y. So, the .kunitconfig I used to
> > produce the output above was:
> >
> >         CONFIG_KUNIT=y
> >         CONFIG_KUNIT_ALL_TESTS=n
> >         CONFIG_TRACEPOINTS=y
> >         CONFIG_KASAN=y
> >         CONFIG_KASAN_GENERIC=y
> >         CONFIG_KASAN_KUNIT_TEST=y
> >
> > This more or less mirrors what mm/kfence/.kunitconfig is doing, which also isn't
> > working on my side; kunit.py reports the same error.
> 
> mm/kfence/.kunitconfig does CONFIG_FTRACE=y. TRACEPOINTS is not user
> selectable. I don't think any of this has changed since the initial
> discussion above, so CONFIG_FTRACE=y is still needed.

Using CONFIG_FTRACE=y instead of CONFIG_TRACEPOINTS=y produces the same error 
for me. 

So

	CONFIG_KUNIT=y
	CONFIG_KUNIT_ALL_TESTS=n
	CONFIG_FTRACE=y
	CONFIG_KASAN=y
	CONFIG_KASAN_GENERIC=y
	CONFIG_KASAN_KUNIT_TEST=y

produces

	➜   ./tools/testing/kunit/kunit.py run --kunitconfig=mm/kasan/.kunitconfig --arch=arm64
	Configuring KUnit Kernel ...
	Regenerating .config ...
	Populating config with:
	$ make ARCH=arm64 O=.kunit olddefconfig CC=clang
	ERROR:root:Not all Kconfig options selected in kunitconfig were in the generated .config.
	This is probably due to unsatisfied dependencies.
	Missing: CONFIG_KASAN_KUNIT_TEST=y
	
By that error message, CONFIG_FTRACE appears to be present in the generated 
config, but CONFIG_KASAN_KUNIT_TEST still isn't. Presumably, 
CONFIG_KASAN_KUNIT_TEST is missing because of an unsatisfied dependency, which 
must be CONFIG_TRACEPOINTS, unless I'm missing something ...

If I just generate an arm64 defconfig and select CONFIG_FTRACE=y, 
CONFIG_TRACEPOINTS=y shows up in my .config. So, maybe this is kunit.py-related 
then?

Andrey, you said that the tests have been working for you; are you running them 
with kunit.py?

Many thanks,
Paul