Cannot allocate memory after several times create camera and close camera

[LeifSec]

Describe the bug If creating a camera object, closing it / destroying it (when going out of scope) there is a Cannot allocate memory error after some iterations.

To Reproduce

from picamera2 import Picamera2
from libcamera import ColorSpace, Transform


camera = Picamera2()
configuration = {
    'use_case': 'preview',
    'transform': Transform(),
    'colour_space': ColorSpace.Sycc(),
    'buffer_count': 4,
    'queue': True,
    'main': {'format': 'XBGR8888', 'size': (640, 480)},
    'lores': None, 'raw': {'format': 'SRGGB12_CSI2P', 'size': (640, 480)},
    'controls': {'NoiseReductionMode': 3,
                 'FrameDurationLimits': (100, 83333),
                 'Saturation': 0,
                 'Sharpness': 30,
                 'Brightness': 45, 'AnalogueGain': 5,
                 'ColourGains': (0, 0)},
    'sensor': {},
    'display': 'main',
    'encode': 'main'}

for i in range(0, 20):
    camera.configure(configuration)

camera.close()



for i in range(0, 20):
    print("\n\n -------------------------------", i)
    camera = Picamera2()
    camera.configure(configuration)   # error here after 7 iterations
    camera.close()

Console Output, Screenshots

 ------------------------------- 7
[6:41:18.507074914] [32605]  INFO Camera camera.cpp:1183 configuring streams: (0) 640x480-XBGR8888 (1) 2028x1520-SBGGR12_CSI2P
[6:41:18.508306508] [32611]  INFO RPI vc4.cpp:608 Sensor: /base/soc/i2c0mux/i2c@1/imx477@1a - Selected sensor format: 2028x1520-SBGGR12_1X12 - Selected unicam format: 2028x1520-pBCC
Traceback (most recent call last):
  File "/home/pi/./memory.py", line 37, in <module>
    camera.configure(configuration)
  File "/usr/lib/python3/dist-packages/picamera2/picamera2.py", line 1104, in configure
    self.configure_(camera_config)
  File "/usr/lib/python3/dist-packages/picamera2/picamera2.py", line 1087, in configure_
    self.allocator.allocate(libcamera_config)
  File "/usr/lib/python3/dist-packages/picamera2/allocators/dmaallocator.py", line 43, in allocate
    fd = self.dmaHeap.alloc(f"picamera2-{i}", stream_config.frame_size)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/picamera2/dma_heap.py", line 98, in alloc
    ret = fcntl.ioctl(self.__dmaHeapHandle.get(), DMA_HEAP_IOCTL_ALLOC, alloc)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
OSError: [Errno 12] Cannot allocate memory

Hardware :

• imx477
• Raspberry Pi 2 Model B Rev 1.1

Additional context Raspberian 12

rpicam-apps build: f74361ee6a56 23-11-2023 (17:01:12)
libcamera build: v0.1.0+118-563cd78e

[davidplowman]

Can you check what version of Picamera2 you have (apt list python3-picamera2)? Thanks.

[LeifSec]

python3-picamera2/stable,stable,now 0.3.16-1 all [installed

[davidplowman]

@will-v-pi Hi William, could I maybe ask you to have a look at this one? I think we may be leaking stuff in the DmaAllocator when the camera is configured and closed without ever being started. Possibly the DMA heap handle too, not sure. The simplest test case appears to be this

from picamera2 import Picamera2

for _ in range(200):
    picam2 = Picamera2()
    picam2.configure()
    picam2.close()

Thanks!

[will-v-pi]

Yep, I've found the leak and a fix - I'll make a pull request to next

[davidplowman]

Yep, I've found the leak and a fix - I'll make a pull request to next

Brilliant, thanks!

[tim-oe]

getting what looks like the same error and reboot is the only thing that seems to clear it

lib: python3-picamera2/stable,stable,now 0.3.23-1 all [installed] OS: Debian GNU/Linux 12 (bookworm)

stack:

2024-12-08 17:53:02,670|CameraSvc.py:50|ERROR- failed to take picture Traceback (most recent call last): File "/home/tcronin/src/WeatherWatch/weatherwatch/camera/Camera.py", line 80, in process picam2.switch_mode_and_capture_file(capture_config, imgFile, wait=True) File "/usr/lib/python3/dist-packages/picamera2/picamera2.py", line 1467, in switch_mode_and_capture_file return self.dispatch_functions(functions, wait, signal_function, immediate=True) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3/dist-packages/picamera2/picamera2.py", line 1363, in dispatch_functions return job.get_result(timeout=timeout) if wait else job ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3/dist-packages/picamera2/job.py", line 79, in get_result return self._future.result(timeout=timeout) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3.11/concurrent/futures/_base.py", line 456, in result return self.__get_result() ^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3.11/concurrent/futures/_base.py", line 401, in _get_result raise self.exception File "/usr/lib/python3/dist-packages/picamera2/job.py", line 48, in execute done, result = self.functions0 ^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3/dist-packages/picamera2/picamera2.py", line 1430, in switch_mode self.configure(camera_config) File "/usr/lib/python3/dist-packages/picamera2/picamera2.py", line 1110, in configure self.allocator.allocate(libcamera_config, camera_config.get("use_case")) File "/usr/lib/python3/dist-packages/picamera2/allocators/persistent_allocator.py", line 29, in allocate super().allocate(libcamera_config, use_case) File "/usr/lib/python3/dist-packages/picamera2/allocators/dmaallocator.py", line 43, in allocate fd = self.dmaHeap.alloc(f"picamera2-{i}", stream_config.frame_size) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3/dist-packages/picamera2/dma_heap.py", line 98, in alloc ret = fcntl.ioctl(self.__dmaHeapHandle.get(), DMA_HEAP_IOCTL_ALLOC, alloc) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ OSError: [Errno 12] Cannot allocate memory

[davidplowman]

@tim-oe Thanks for the report. However, it is almost certainly not the same problem because that one was fixed. Please do file a new report. Be sure to:

• Confirm that you are running fully up-to-date software. If necessary, download a fresh install, run sudo apt update and sudo apt full-upgrade and confirm that you can still reproduce the problem.
• Please report the output of apt list python3-picamera2, rpicam-hello --version and uname -a.
• Please state what kind of a Pi you are using.
• Please state what kind of camera you are using.
• Please state whether you have made any alterations in your /boot/firmware/config.txt file.
• Please include a short script (no more than 20 lines if possible) that we can use to reproduce the problem.

Thanks!