Re: [PATCH v2] riscv: add support for SECCOMP and SECCOMP_FILTER

From: David Abdurachmanov <david.abdurachmanov@gmail.com>
To: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Tycho Andersen <tycho@tycho.ws>,
	Palmer Dabbelt <palmer@sifive.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Oleg Nesterov <oleg@redhat.com>,
	Kees Cook <keescook@chromium.org>,
	Andy Lutomirski <luto@amacapital.net>,
	Will Drewry <wad@chromium.org>, Shuah Khan <shuah@kernel.org>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
	Yonghong Song <yhs@fb.com>,
	David Abdurachmanov <david.abdurachmanov@sifive.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Allison Randal <allison@lohutok.net>,
	Alexios Zavras <alexios.zavras@intel.com>,
	Anup Patel <Anup.Patel@wdc.com>,
	Vincent Chen <vincentc@andestech.com>,
	Alan Kao <alankao@andestech.com>,
	linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	linux-kselftest@vger.kernel.org, netdev@vger.kernel.org,
	bpf@vger.kernel.org, me@carlosedp.com
Subject: Re: [PATCH v2] riscv: add support for SECCOMP and SECCOMP_FILTER
Date: Fri, 23 Aug 2019 18:04:21 -0700	[thread overview]
Message-ID: <CAEn-LTp=ss0Dfv6J00=rCAy+N78U2AmhqJNjfqjr2FDpPYjxEQ@mail.gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.21.9999.1908231717550.25649@viisi.sifive.com>

On Fri, Aug 23, 2019 at 5:30 PM Paul Walmsley <paul.walmsley@sifive.com> wrote:
>
> On Thu, 22 Aug 2019, David Abdurachmanov wrote:
>
> > There is one failing kernel selftest: global.user_notification_signal
>
> Is this the only failing test?  Or are the rest of the selftests skipped
> when this test fails, and no further tests are run, as seems to be shown
> here:
>
>   https://lore.kernel.org/linux-riscv/CADnnUqcmDMRe1f+3jG8SPR6jRrnBsY8VVD70VbKEm0NqYeoicA@mail.gmail.com/

Yes, it's a single test failing. After removing global.user_notification_signal
test everything else pass and you get the results printed.

>
> For example, looking at the source, I'd naively expect to see the
> user_notification_closed_listener test result -- which follows right
> after the failing test in the selftest source.  But there aren't any
> results?

Yes, it hangs at this point. You have to manually terminate it.

>
> Also - could you follow up with the author of this failing test to see if
> we can get some more clarity about what might be going wrong here?  It
> appears that the failing test was added in commit 6a21cc50f0c7f ("seccomp:
> add a return code to trap to userspace") by Tycho Andersen
> <tycho@tycho.ws>.

Well the code states ".. and hope that it doesn't break when there
is actually a signal :)". Maybe we are just unlucky. I don't have results
from other architectures to compare.

I found that Linaro is running selftests, but SECCOMP is disabled
and thus it's failing. Is there another CI which tracks selftests?

https://qa-reports.linaro.org/lkft/linux-next-oe/tests/kselftest/seccomp_seccomp_bpf?top=next-20190823

>
>
> - Paul