From: Jesper Dangaard Brouer <brouer@redhat.com>
To: Will Deacon <will@kernel.org>
Cc: Song Liu <songliubraving@fb.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Alexei Starovoitov <ast@kernel.org>,
ardb@kernel.org, Jean-Philippe Brucker <jean-philippe@linaro.org>,
Anders Roxell <anders.roxell@linaro.org>,
Daniel Borkmann <daniel@iogearbox.net>,
naresh.kamboju@linaro.org,
John Fastabend <john.fastabend@gmail.com>,
Zi Shen Lim <zlim.lnx@gmail.com>,
Jakub Kicinski <kuba@kernel.org>,
Andrii Nakryiko <andriin@fb.com>,
Jesper Dangaard Brouer <hawk@kernel.org>,
brouer@redhat.com, Yonghong Song <yhs@fb.com>,
KP Singh <kpsingh@chromium.org>,
linux-arm-kernel@lists.infradead.org,
Yauheni Kaliuta <yauheni.kaliuta@redhat.com>,
netdev@vger.kernel.org,
Ilias Apalodimas <ilias.apalodimas@linaro.org>,
linux-kernel@vger.kernel.org,
"David S. Miller" <davem@davemloft.net>,
bpf@vger.kernel.org, Martin KaFai Lau <kafai@fb.com>
Subject: Re: [PATCH] arm64: bpf: Fix branch offset in JIT
Date: Mon, 14 Sep 2020 18:12:34 +0200 [thread overview]
Message-ID: <20200914181234.0f1df8ba@carbon> (raw)
In-Reply-To: <20200914140114.GG24441@willie-the-truck>
On Mon, 14 Sep 2020 15:01:15 +0100 Will Deacon <will@kernel.org> wrote:
> Hi Ilias,
>
> On Mon, Sep 14, 2020 at 04:23:50PM +0300, Ilias Apalodimas wrote:
> > On Mon, Sep 14, 2020 at 03:35:04PM +0300, Ilias Apalodimas wrote:
> > > On Mon, Sep 14, 2020 at 01:20:43PM +0100, Will Deacon wrote:
> > > > On Mon, Sep 14, 2020 at 11:36:21AM +0300, Ilias Apalodimas wrote:
> > > > > Running the eBPF test_verifier leads to random errors looking like this:
>
> [...]
> > >
> > Any suggestion on any Fixes I should apply? The original code was 'correct' and
> > broke only when bounded loops and their self-tests were introduced.
>
> Ouch, that's pretty bad as it means nobody is regression testing BPF on
> arm64 with mainline. Damn.
Yes, it unfortunately seems that upstream is lacking BPF regression
testing for ARM64 :-(
This bug surfaced when Red Hat QA tested our kernel backports, on
different archs.
--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat
LinkedIn: http://www.linkedin.com/in/brouer
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next prev parent reply other threads:[~2020-09-14 16:15 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-14 8:36 [PATCH] arm64: bpf: Fix branch offset in JIT Ilias Apalodimas
2020-09-14 12:20 ` Will Deacon
2020-09-14 12:35 ` Ilias Apalodimas
2020-09-14 13:23 ` Ilias Apalodimas
2020-09-14 14:01 ` Will Deacon
2020-09-14 16:02 ` Ilias Apalodimas
2020-09-14 16:12 ` Jesper Dangaard Brouer [this message]
2020-09-14 17:02 ` Ilias Apalodimas
2020-09-14 17:47 ` Xi Wang
2020-09-14 17:55 ` Ilias Apalodimas
2020-09-14 18:08 ` Xi Wang
2020-09-14 18:21 ` Luke Nelson
2020-09-14 18:36 ` Ilias Apalodimas
2020-09-14 18:27 ` Ilias Apalodimas
2020-09-14 18:52 ` Xi Wang
2020-09-14 19:24 ` Ilias Apalodimas
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