Re: [PATCH bpf-next] selftests/bpf: Track test_xdp_features DUT processes

[Jiayuan Chen <jiayuan.chen@linux.dev>]

On 8/5/26 3:29 PM, Bochao Cao via B4 Relay wrote:
> From: Bochao Cao <bochaolucky@gmail.com>
>
> test_xdp_features.sh waits for any xdp_features listener to appear and
> uses pidof during cleanup. A concurrent test can therefore make another
> test proceed before its own DUT is ready, and cleanup kills every
> xdp_features process on the host. The readiness loop also has no timeout,
> so a DUT that exits before listening leaves the test hung indefinitely.
>
> Record each DUT PID when it is spawned, wait for ss to report that exact
> PID with a bounded retry loop, and only terminate and reap recorded
> children. Install an EXIT trap and signal handlers so failure paths also
> remove child processes and network setup.
>
> This also removes the runtime dependency on pidof.
>
> Fixes: 4dba3e7852b7 ("selftests/bpf: introduce XDP compliance test tool")
> Closes: https://bugs.debian.org/1136522


It looks like part of the motivation here is dropping the pidof dependency?
I don't think that's worth optimizing. Selftests already require a bunch of
tools from non-essential packages (ip, ss and ethtool in this very script)