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[BUG] AttributeError: 'Picamera2' object has no attribute 'allocator' #1401
Description
Bug Description
On Raspberry Pi 4 and lower, I do sporadically see the following exception when taking photos or videos with raspiCamSrv:
Jul 03 12:50:18 raspi03 gunicorn[1917]: [0:40:33.356886445] [2036] ERROR Camera camera.cpp:702 Camera in Acquired state trying acquire() requiring state Available
Jul 03 12:50:18 raspi03 gunicorn[1917]: picamera2.picamera2 ERROR: Camera __init__ sequence did not complete.
Jul 03 12:50:18 raspi03 gunicorn[1917]: Exception in thread Thread-12 (listen):
Jul 03 12:50:18 raspi03 gunicorn[1917]: Traceback (most recent call last):
Jul 03 12:50:18 raspi03 gunicorn[1917]: File "/usr/lib/python3.13/threading.py", line 1043, in _bootstrap_inner
Jul 03 12:50:18 raspi03 gunicorn[1917]: self.run()
Jul 03 12:50:18 raspi03 gunicorn[1917]: ~~~~~~~~^^
Jul 03 12:50:18 raspi03 gunicorn[1917]: File "/usr/lib/python3.13/threading.py", line 994, in run
Jul 03 12:50:18 raspi03 gunicorn[1917]: self._target(*self._args, **self._kwargs)
Jul 03 12:50:18 raspi03 gunicorn[1917]: ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Jul 03 12:50:18 raspi03 gunicorn[1917]: File "/usr/lib/python3/dist-packages/picamera2/picamera2.py", line 124, in listen
Jul 03 12:50:18 raspi03 gunicorn[1917]: callback()
Jul 03 12:50:18 raspi03 gunicorn[1917]: ~~~~~~~~^^
Jul 03 12:50:18 raspi03 gunicorn[1917]: File "/usr/lib/python3/dist-packages/picamera2/picamera2.py", line 141, in handle_request
Jul 03 12:50:18 raspi03 gunicorn[1917]: self.cameras[req.cookie]._requests += [CompletedRequest(req, self.cameras[req.cookie])]
Jul 03 12:50:18 raspi03 gunicorn[1917]: ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Jul 03 12:50:18 raspi03 gunicorn[1917]: File "/usr/lib/python3/dist-packages/picamera2/request.py", line 101, in __init__
Jul 03 12:50:18 raspi03 gunicorn[1917]: picam2.allocator.sync(self.picam2.allocator, buffer, False) for buffer in self.request.buffers.values()
Jul 03 12:50:18 raspi03 gunicorn[1917]: ^^^^^^^^^^^^^^^^
Jul 03 12:50:18 raspi03 gunicorn[1917]: AttributeError: 'Picamera2' object has no attribute 'allocator'
To Reproduce
I currently cannot see specific conditions under which the error occurs.
The affected functions in raspiCamSrv usually work without problems, but sometimes the error occurs.
I also have some doubt in Camera in Acquired state trying acquire() requiring state Available because the relevant Picamera2 calls are done after the camera has been closed previously and a garbage collection has been executed.
On Raspberry Pi 5, this error has never been observed.
Hardware and Software Stack
Activity
davidplowman commentedon Jul 3, 2026
I notice that the following:
fails with exactly this error. So I suppose someone is re-opening the camera by creating a new Picamera2(), while that device is already open and running. Obviously that's going to fail, but it shouldn't be trashing your previously opened instance. #1402 should fix this.
signag commentedon Jul 6, 2026
Hi,
thanks for your quick response.
Based on your info, I could locate and fix my bug.