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commit852b644acbupstream. The 'run_tests' function is executed in the background, but killing its associated PID would not kill the children tasks running in the background. To properly kill all background tasks, 'kill -- -PID' could be used, but this requires kill from procps-ng. Instead, all children tasks are listed using 'ps', and 'kill' is called with all PIDs of this group. Fixes:31ee4ad86a("selftests: mptcp: join: stop transfer when check is done (part 1)") Cc: stable@vger.kernel.org Fixes:04b57c9e09("selftests: mptcp: join: stop transfer when check is done (part 2)") Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Link: https://patch.msgid.link/20251110-net-mptcp-sft-join-unstable-v1-6-a4332c714e10@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>