Re: [PATCHv2 perf/core 15/22] selftests/bpf: Add hit/attach/detach race optimized uprobe test

On Thu, May 15, 2025 at 10:31:28AM -0700, Andrii Nakryiko wrote:

SNIP

quoted

+static void test_uprobe_race(void)
+{
+       int err, i, nr_threads;
+       pthread_t *threads;
+
+       nr_threads = libbpf_num_possible_cpus();
+       if (!ASSERT_GT(nr_threads, 0, "libbpf_num_possible_cpus"))
+               return;
+       nr_threads = max(2, nr_threads);
+
+       threads = malloc(sizeof(*threads) * nr_threads);

leaking this? maybe just use `pthread_t thread[nr_threads];`? or alloca()?

ugh.. will fix

quoted

+       if (!ASSERT_OK_PTR(threads, "malloc"))
+               return;
+
+       for (i = 0; i < nr_threads; i++) {
+               err = pthread_create(&threads[i], NULL, i % 2 ? worker_trigger : worker_attach,
+                                    NULL);
+               if (!ASSERT_OK(err, "pthread_create"))
+                       goto cleanup;
+       }
+
+       sleep(4);

4 seconds... can we make it much shorter and allow to define the
actual runtime with envvar? So for thorough testing you'll define
something multi-second, but once things land and settle we can run it
for 100ms at most and not slow down CI significantly? All these slow
tests do add up :(

ok, makes sense

thanks,
jirka