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Parallel verbose test execution can trigger a race condition in tpebs_stop if called concurrently or when PID reuse occurs, causing finish_command() to block or reap the wrong process. Introduce a `tpebs_stopping` flag inside intel-tpebs.c to prevent redundant stop execution paths, and safely restore the `cmd.pid` temporarily only during `finish_command()` to ensure it is properly reaped, while preventing other threads from referencing it. Assisted-by: Gemini-CLI:Google Gemini 3 Signed-off-by: Ian Rogers <irogers@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@linaro.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>