picamera overlay bug (mmal)

[spinomaly]

I have a B+ with the latest Noobs Raspian off the website (release date 2014-09-09). I am having troubles adding and removing overlays. After a sequence of approximately 60 add/remove overlays an out of memory error occurs. Code below as well as error. I watched the system memory during the add and remove overlay and the memory decreases at a specific rate that appears to be related to either the preview or bumpy buffer size. However, If I specify a smaller preview size than below the memory error still occurs with remaining system memory (but that still was decreasing).

import time
import picamera
import numpy as np

a = np.zeros((720, 1280, 3), dtype=np.uint8)
a[360, :, :] = 0xff
a[:, 640, :] = 0xff

i = 0

with picamera.PiCamera() as camera:
    camera.resolution = (1280, 720)
    camera.framerate = 24
    camera.start_preview()

    while True:

        i += 1
        print(i)
        o = camera.add_overlay(np.getbuffer(a), layer=3, alpha=64)
        time.sleep(.1)
        camera.remove_overlay(o)

mmal: mmal_vc_component_create: failed to create component 'vc.ril.video_render' (1:ENOMEM)
mmal: mmal_component_create_core: could not create component 'vc.ril.video_render' (1)
Traceback (most recent call last):
File "overlay_bug.py", line 26, in <module>
o = camera.add_overlay(np.getbuffer(a), layer=3, alpha=64)
File "/usr/lib/python2.7/dist-packages/picamera/camera.py", line 953, in add_overlay
renderer = PiOverlayRenderer(self, source, size, **options)
File "/usr/lib/python2.7/dist-packages/picamera/renderers.py", line 474, in __init__
rotation, vflip, hflip)
File "/usr/lib/python2.7/dist-packages/picamera/renderers.py", line 89, in __init__
prefix="Failed to create renderer component")
File "/usr/lib/python2.7/dist-packages/picamera/exc.py", line 133, in mmal_check
raise PiCameraMMALError(status, prefix)
picamera.exc.PiCameraMMALError: Failed to create renderer component: Out of memory

[waveform80]

Excellent - thanks for the bug report - I'll mark this for 1.9