linux-kernel - Re: [PATCH net v3 3/3] selftest: netcons: create a torture test

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Message-ID: <20250908101353.GC2015@horms.kernel.org>
Date: Mon, 8 Sep 2025 11:13:53 +0100
From: Simon Horman <horms@...nel.org>
To: Breno Leitao <leitao@...ian.org>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Shuah Khan <shuah@...nel.org>, david decotigny <decot@...glers.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-kselftest@...r.kernel.org, asantostc@...il.com, efault@....de,
	calvin@...nvd.org, kernel-team@...a.com, stable@...r.kernel.org
Subject: Re: [PATCH net v3 3/3] selftest: netcons: create a torture test

On Fri, Sep 05, 2025 at 10:25:09AM -0700, Breno Leitao wrote:
> Create a netconsole test that puts a lot of pressure on the netconsole
> list manipulation. Do it by creating dynamic targets and deleting
> targets while messages are being sent. Also put interface down while the
> messages are being sent, as creating parallel targets.
> 
> The code launches three background jobs on distinct schedules:
> 
>  * Toggle netcons target every 30 iterations
>  * create and delete random_target every 50 iterations
>  * toggle iface every 70 iterations
> 
> This creates multiple concurrency sources that interact with netconsole
> states. This is good practice to simulate stress, and exercise netpoll
> and netconsole locks.
> 
> This test already found an issue as reported in [1]
> 
> Link: https://lore.kernel.org/all/20250901-netpoll_memleak-v1-1-34a181977dfc@debian.org/ [1]
> Signed-off-by: Breno Leitao <leitao@...ian.org>
> Reviewed-by: Andre Carvalho <asantostc@...il.com>

Reviewed-by: Simon Horman <horms@...nel.org>