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Date: Wed, 1 Apr 2026 19:52:00 -0700
From: Jakub Kicinski <kuba@kernel.org>
To: Qingfang Deng <dqfext@gmail.com>
Cc: Dianne Skoll <dianne@skoll.ca>, Shuah Khan <shuah@kernel.org>, "David S.
 Miller" <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>, Paolo
 Abeni <pabeni@redhat.com>, Simon Horman <horms@kernel.org>, Felix Maurer
 <fmaurer@redhat.com>, Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
 "Matthieu Baerts (NGI0)" <matttbe@kernel.org>,
 linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
 linux-ppp@vger.kernel.org, netdev@vger.kernel.org, Paul Mackerras
 <paulus@ozlabs.org>
Subject: Re: [PATCH net-next v7] selftests: net: add tests for PPP
Message-ID: <20260401195200.34548957@kernel.org>
In-Reply-To: <CALW65jaTbaosbO8ypKZ6G37HxuxXabeTaP_Fhq72xTovmDj+8g@mail.gmail.com>
References: <20260330035604.133073-1-dqfext@gmail.com>
	<20260401081030.29b050d5@kernel.org>
	<CALW65jahWApDnVmFReW+Y3HDxBEmCwzsT1oyh03SW7X5ry6PzA@mail.gmail.com>
	<20260401175621.549c492e@kernel.org>
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On Thu, 2 Apr 2026 10:26:11 +0800 Qingfang Deng wrote:
> Hi,
>=20
> On Thu, Apr 2, 2026 at 8:56=E2=80=AFAM Jakub Kicinski <kuba@kernel.org> w=
rote:
> >
> > On Wed, 1 Apr 2026 23:45:38 +0800 Qingfang Deng wrote: =20
>  [...] =20
> > >
> > > It looks like pppoe-server fails to start. You may check the syslog to
> > > see what's going on. =20
> >
> > Hm, we don't capture syslog automatically :S We capture stdout and
> > stderr
> >
> > I'm not even sure there's something listening on syslog in virtme-ng
> > Is it possible to make the daemon log to stdout or a file and dump
> > that file to stdout on failure? Even if we fix the current issue
> > it will be quite inconvenient if we have to go into syslog every time
> > the test is failing. The test output should provide enough info to
> > debug failures. =20
>=20
> Add Cc: Dianne
>=20
> I checked the man page of pppoe-server and did not find such option.
> We can instead start our own listener and redirect the syslog to a
> file or stdout:
>=20
> socat -u UNIX-RECV:/dev/log,ignoreeof STDOUT &

That should work for vng, I confirmed it doesn't seem to have a syslog
socket

$ vng -r
...
$ ls /dev/log
ls: cannot access '/dev/log': No such file or directory