linux-kernel - Re: [PATCH bpf v2 1/2] selftests/bpf: add a test for subprogram extables

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Message-ID: <CAADnVQL0qNQqoFAXq9NJ5-QR4wPtSruaeJ70q6DKv4z1iv3x8w@mail.gmail.com>
Date:   Thu, 8 Jun 2023 15:02:26 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Yonghong Song <yhs@...a.com>
Cc:     Krister Johansen <kjlx@...pleofstupid.com>,
        bpf <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>, stable <stable@...r.kernel.org>
Subject: Re: [PATCH bpf v2 1/2] selftests/bpf: add a test for subprogram extables

On Thu, Jun 8, 2023 at 10:40 AM Yonghong Song <yhs@...a.com> wrote:
>
>
>
> On 6/7/23 2:04 PM, Krister Johansen wrote:
> > In certain situations a program with subprograms may have a NULL
> > extable entry.  This should not happen, and when it does, it turns a
> > single trap into multiple.  Add a test case for further debugging and to
> > prevent regressions.  N.b: without any other patches this can panic or
> > oops a kernel.
>
> Also, it would be great if you can show the kernel oops stack trace.

+1

Also please reorder the patches.
patch 1 - fix
patch 2 - test for the fix.