On Tue,  7 Jul 2026 12:59:12 -0400
Michael Bommarito [off-list ref] wrote:

 
+/*
+ * Deleting an event drops its last reference, but an unregister may defer
+ * that put (and the freeing of the associated enabler) past an RCU grace
+ * period. The delete can therefore transiently fail with -EBUSY while the
+ * previous reference is still being dropped. Retry for up to ~10 seconds.
+ */
+static int wait_for_event_delete(void)
+{
+	int i, ret;
+
+	for (i = 0; i < 10000; ++i) {
+		ret = event_delete();
+
+		if (ret == 0)
+			return 0;
+
+		usleep(1000);
+	}
+
+	return ret;
+}
+

Care to address Sashiko's comment: https://sashiko.dev/#/patchset/20260707165912.2560537-2-michael.bommarito%40gmail.com

I'll pull in patch 1 and start testing it as this one is just the tools
change, it doesn't need my testing (my tests only tests kernel changes)

-- Steve