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Message-ID: <52f0cd4c-9306-43af-87a7-3f5c47646059@kernel.org>
Date: Fri, 1 Mar 2024 19:24:53 +0100
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Subject: Re: [PATCH net 10/10] selftests: mptcp: explicitly trigger the
 listener diag code-path
Content-Language: en-GB, fr-BE
From: Matthieu Baerts <matttbe@kernel.org>
To: Jakub Kicinski <kuba@kernel.org>
Cc: Mat Martineau <martineau@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
 mptcp@lists.linux.dev, Geliang Tang <geliang@kernel.org>,
 "David S. Miller" <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>,
 Florian Westphal <fw@strlen.de>, Kishen Maloor <kishen.maloor@intel.com>,
 Shuah Khan <shuah@kernel.org>, Peter Krystad
 <peter.krystad@linux.intel.com>, Christoph Paasch <cpaasch@apple.com>,
 netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
 linux-kselftest@vger.kernel.org
References: <20240223-upstream-net-20240223-misc-fixes-v1-0-162e87e48497@kernel.org>
 <20240223-upstream-net-20240223-misc-fixes-v1-10-162e87e48497@kernel.org>
 <20240301063754.2ecefecf@kernel.org>
 <09046dcc-a388-4703-83bb-9fa0c36af861@kernel.org>
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Organization: NGI0 Core
In-Reply-To: <09046dcc-a388-4703-83bb-9fa0c36af861@kernel.org>
Content-Type: text/plain; charset=UTF-8
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Hi Jakub,

On 01/03/2024 16:10, Matthieu Baerts wrote:
> On 01/03/2024 15:37, Jakub Kicinski wrote:
>> On Fri, 23 Feb 2024 17:14:20 +0100 Matthieu Baerts (NGI0) wrote:
>>> From: Paolo Abeni <pabeni@redhat.com>
>>>
>>> The mptcp diag interface already experienced a few locking bugs
>>> that lockdep and appropriate coverage have detected in advance.
>>>
>>> Let's add a test-case triggering the relevant code path, to prevent
>>> similar issues in the future.
>>>
>>> Be careful to cope with very slow environments.
>>>
>>> Note that we don't need an explicit timeout on the mptcp_connect
>>> subprocess to cope with eventual bug/hang-up as the final cleanup
>>> terminating the child processes will take care of that.
>>
>> Hi!
>>
>> There's a failure in CI under debug after merging net and net-next 
>> in diag.sh. Maybe because of the patch which lowered timeout?
>> https://lore.kernel.org/all/20240223-upstream-net-next-20240223-misc-improvements-v1-8-b6c8a10396bd@kernel.org/
> 
> Thank you for this message!
> 
> I didn't have this error on my side, even without '-d SLUB_DEBUG_ON' we
> do on top of the debug kconfig, but I see I can reproduce it on slower
> environments. Indeed, it looks like it can be caused by that
> modification. I will send a fix ASAP!

The following patch fixes the issue on my side (when using 'renice 20'
and stress-ng in parallel :) ):

https://lore.kernel.org/netdev/20240301-upstream-net-20240301-selftests-mptcp-diag-exit-timeout-v1-2-07cb2fa15c06@kernel.org/T/

I queued it for -net, but the issue should only be visible in net-next
due to the reduction of the timeout, as you suggested. This patch can
also be applied in net-next if preferred, it will not cause any
conflicts between net and net-next.

Cheers,
Matt
-- 
Sponsored by the NGI0 Core fund.