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From: Alexander Potapenko <glider@google.com>
Date: Tue, 4 Jun 2024 17:26:18 +0200
Message-ID: <CAG_fn=XNZ-OyjboNctGSL-zZiag4NVFNs+uaPm95Y9Rrc+TOaQ@mail.gmail.com>
Subject: Re: [PATCH 2/4] kcov: add interrupt handling self test
To: Dmitry Vyukov <dvyukov@google.com>
Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, 
	dave.hansen@linux.intel.com, x86@kernel.org, linux-kernel@vger.kernel.org, 
	syzkaller@googlegroups.com, elver@google.com, nogikh@google.com, 
	tarasmadan@google.com
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On Tue, Jun 4, 2024 at 3:45=E2=80=AFPM Dmitry Vyukov <dvyukov@google.com> w=
rote:
>
> Add a boot self test that can catch sprious coverage from interrupts.
> The coverage callback filters out interrupt code, but only after the
> handler updates preempt count. Some code periodically leaks out
> of that section and leads to spurious coverage.
> Add a best-effort (but simple) test that is likely to catch such bugs.
> If the test is enabled on CI systems that use KCOV, they should catch
> any issues fast.
>
> Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
> Cc: x86@kernel.org
> Cc: linux-kernel@vger.kernel.org
> Cc: syzkaller@googlegroups.com
Reviewed-by: Alexander Potapenko <glider@google.com>