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From:   Lorenz Bauer <lmb@isovalent.com>
Date:   Wed, 24 May 2023 18:04:43 +0100
Message-ID: <CAN+4W8iMcwwVjmSekZ9txzZNxOZ0x98nBXo4cEoTU9G2zLe8HA@mail.gmail.com>
Subject: Re: [PATCH AUTOSEL 6.2 08/30] selftests/bpf: check that modifier
 resolves after pointer
To:     Greg KH <gregkh@linuxfoundation.org>
Cc:     Sasha Levin <sashal@kernel.org>, linux-kernel@vger.kernel.org,
        stable@vger.kernel.org, Martin KaFai Lau <martin.lau@kernel.org>,
        ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
        shuah@kernel.org, yhs@fb.com, eddyz87@gmail.com, sdf@google.com,
        error27@gmail.com, iii@linux.ibm.com, memxor@gmail.com,
        bpf@vger.kernel.org, linux-kselftest@vger.kernel.org
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On Wed, May 24, 2023 at 5:04=E2=80=AFPM Greg KH <gregkh@linuxfoundation.org=
> wrote:
>
> Great, any specific commits that fix this issue would be appreciated to
> be pointed at so we can apply them.

The problem was introduced by commit f4b8c0710ab6 ("selftests/bpf: Add
verifier test for release_reference()") in your tree. Seems like
fixup_map_ringbuf was introduced in upstream commit 4237e9f4a962
("selftests/bpf: Add verifier test for PTR_TO_MEM spill") but that
wasn't backported.

To restate my original question: how can we avoid breaking BPF
selftests? From personal experience this happens somewhat regularly.

Best
Lorenz