linux-kernel - Re: [PATCH net] selftests: net: lib: kill PIDs before del netns

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Message-ID: <ZrwSZGj-BgJJADaG@Laptop-X1>
Date: Wed, 14 Aug 2024 10:11:48 +0800
From: Hangbin Liu <liuhangbin@...il.com>
To: "Matthieu Baerts (NGI0)" <matttbe@...nel.org>
Cc: mptcp@...ts.linux.dev, "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>, Petr Machata <petrm@...dia.com>,
	netdev@...r.kernel.org, linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org, Mat Martineau <martineau@...nel.org>
Subject: Re: [PATCH net] selftests: net: lib: kill PIDs before del netns

On Tue, Aug 13, 2024 at 03:39:34PM +0200, Matthieu Baerts (NGI0) wrote:
> When deleting netns, it is possible to still have some tasks running,
> e.g. background tasks like tcpdump running in the background, not
> stopped because the test has been interrupted.
> 
> Before deleting the netns, it is then safer to kill all attached PIDs,
> if any. That should reduce some noises after the end of some tests, and
> help with the debugging of some issues. That's why this modification is
> seen as a "fix".
> 
> Fixes: 25ae948b4478 ("selftests/net: add lib.sh")
> Acked-by: Mat Martineau <martineau@...nel.org>
> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>
> ---
>  tools/testing/selftests/net/lib.sh | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/tools/testing/selftests/net/lib.sh b/tools/testing/selftests/net/lib.sh
> index d0219032f773..8ee4489238ca 100644
> --- a/tools/testing/selftests/net/lib.sh
> +++ b/tools/testing/selftests/net/lib.sh
> @@ -146,6 +146,7 @@ cleanup_ns()
>  
>  	for ns in "$@"; do
>  		[ -z "${ns}" ] && continue
> +		ip netns pids "${ns}" 2> /dev/null | xargs -r kill || true
>  		ip netns delete "${ns}" &> /dev/null || true
>  		if ! busywait $BUSYWAIT_TIMEOUT ip netns list \| grep -vq "^$ns$" &> /dev/null; then
>  			echo "Warn: Failed to remove namespace $ns"
> 
> ---
> base-commit: 58a63729c957621f1990c3494c702711188ca347
> change-id: 20240813-upstream-net-20240813-selftests-net-lib-kill-f7964a3a58fe
> 
> Best regards,
> -- 
> Matthieu Baerts (NGI0) <matttbe@...nel.org>
> 

Thanks for the fix

Reviewed-by: Hangbin Liu <liuhangbin@...il.com>