File descriptor leak on Raspberry Pi

[Jérôme Laheurte]

Hello everybody. There seems to be a file descriptor leak in the device monitor API on ARM; using this sample program:

#include <unistd.h>
#include <gst/gst.h>

int main(int argc, char *argv[]) {
  gst_init(&argc, &argv);

  while (1) {
    GstDeviceMonitor* monitor = gst_device_monitor_new();
    if (!gst_device_monitor_start(monitor))
      return 1;
    gst_device_monitor_stop(monitor);
    gst_object_unref(monitor);

    sleep(1);
  }

  return 0;
}

and monitoring /proc/[pid]/fd, there’s one new file descriptor every second created by eventfd2. Funny thing this only happens on a Raspberry Pi 4B (Raspbian). Versions tested:

  * GStreamer 1.14.4 RPi: leak
  * GStreamer 1.18.4 RPi: leak
  * GStreamer 1.18.4 Intel: no leak
  * GStreamer 1.16.3 Intel: no leak

The only device provider is v4l2, with gudev enabled. I can provide more logs and test more recent versions if necessary, though it will take some time. A quick search in the issues didn’t turn out anything but I wanted to make sure before opening a new one: is this known ?

Best regards
Jérôme Laheurte

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