Re: [PATCH mptcp-next] selftests: mptcp: print stats before socket closure

[Matthieu Baerts <matttbe@kernel.org>]

On 14/08/2026 16:15, sashiko-bot@kernel.org wrote:
> Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
> - [Medium] Invalid iproute2 command `ip netns id` causes an error message and incorrect NSTAT_HISTORY file path.
> --
> 
> --- Patch [1]: [PATCH mptcp-next] selftests: mptcp: print stats before socket closure ---
> commit 0e02bc2b403cc7ef4929da44802ea29557081b60
> Author: Matthieu Baerts (NGI0) <matttbe@kernel.org>
> 
> selftests: mptcp: print stats before socket closure
> 
> This commit adds a mechanism to dump socket statistics via ss and nstat
> just before socket closure when a poll timeout occurs. This helps debug
> timeout issues in the mptcp_connect test.
> 
>> diff --git a/tools/testing/selftests/net/mptcp/mptcp_connect.c b/tools/testing/selftests/net/mptcp/mptcp_connect.c
>> --- a/tools/testing/selftests/net/mptcp/mptcp_connect.c
>> +++ b/tools/testing/selftests/net/mptcp/mptcp_connect.c
> [ ... ]
>> @@ -210,6 +210,19 @@ static void xgetaddrinfo(const char *node, const char *service,
>>  	}
>>  }
>>  
>> +static void print_err_stats(void)
>> +{
>> +	char cmd[128];
>> +
>> +	snprintf(cmd, sizeof(cmd), "ss -Menitam -o '%cport = :%s' >&2",
>> +		 listen_mode ? 's' : 'd', cfg_port);
>> +
>> +	fprintf(stderr, "socket stats before socket closure:\n");
>> +	(void)!system(cmd);
>> +	(void)!system("NSTAT_HISTORY='/tmp/$(ip netns id).nstat' nstat -s | "
> [Severity: Medium]
> Will this ip netns id command fail and cause an iproute2 error during the
> test?
> 
> It appears ip netns id is an invalid command, and should likely be
> ip netns identify.

No, 'ip netns id' is valid and is the same as 'ip netns identify'.

I used the short version initially to fit on 80 chars, but I guess I
should still use 'identify' to avoid this warning when sending the patch
upstream...

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