From f54cd8f43f55c0274c5b51509aff39675639c2e1 Mon Sep 17 00:00:00 2001 From: James Clark Date: Fri, 29 Nov 2024 15:19:48 +0000 Subject: [PATCH] perf test: Don't signal all processes on system when interrupting tests This signal handler loops over all tests on ctrl-C, but it's active while the test list is being constructed. process.pid is 0, then -1, then finally set to the child pid on fork. If the Ctrl-C is received during this point a kill(-1, SIGINT) can be sent which affects all processes. Make sure the child has forked first before forwarding the signal. This can be reproduced with ctrl-C immediately after launching perf test which terminates the ssh connection. Fixes: 553d5efeb341 ("perf test: Add a signal handler to kill forked child processes") Signed-off-by: James Clark Reviewed-by: Ian Rogers Link: https://lore.kernel.org/r/20241129151948.3199732-1-james.clark@linaro.org Signed-off-by: Namhyung Kim --- tools/perf/tests/builtin-test.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c index 8dcf74d3c0a3..4751dd3c6f67 100644 --- a/tools/perf/tests/builtin-test.c +++ b/tools/perf/tests/builtin-test.c @@ -508,7 +508,7 @@ static int __cmd_test(struct test_suite **suites, int argc, const char *argv[], for (size_t x = 0; x < num_tests; x++) { struct child_test *child_test = child_tests[x]; - if (!child_test) + if (!child_test || child_test->process.pid <= 0) continue; pr_debug3("Killing %d pid %d\n",