[OTHER] *OR BUG Picamera 0.3.19-1 hangs on easy_capture script while older versions work fine

Reproduce the hang with picamera2 0.3.19-1 and the easy_capture or start_and_capture_file path using the reported camera and libcamera versions. Read picamera2/previews/null_preview.py and picamera2/previews/drm_preview.py, especially the DRM plane failure, and compare behavior with 0.3.17-1. Done means the capture completes without hanging or raising the reported preview exception.

I don't want to claim this is a bug cause its not really giving much information

I updated my system today to the latest picamera2 (0.3.19-1) and libcamera v0.2.0+120-eb00c13d - suddenly my v3 cameras stopped working in my script when they worked before.

Its a script that starts a stream and it just hangs not even allowing keyboard interrupts. In an effort to see if my cameras are toast. I used the easy_capture script to see if it works.

This is the output from terminal

Python 3.11.2 (main, Mar 13 2023, 12:18:29) [GCC 12.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from picamera2 import Picamera2
>>> Picamera2.set_logging(Picamera2.DEBUG)
>>> picam2 = Picamera2()
[0:02:04.622899557] [2013]  INFO Camera camera_manager.cpp:284 libcamera v0.2.0+120-eb00c13d
[0:02:04.635558974] [2016]  INFO RPI pisp.cpp:695 libpisp version v1.0.6 b567f0455680 17-06-2024 (10:20:00)
[0:02:04.757693176] [2016]  INFO RPI pisp.cpp:1154 Registered camera /base/axi/pcie@120000/rp1/i2c@88000/imx708@1a to CFE device /dev/media1 and ISP device /dev/media0 using PiSP variant BCM2712_C0
[0:02:04.759022655] [2013]  INFO Camera camera_manager.cpp:284 libcamera v0.2.0+120-eb00c13d
[0:02:04.771072906] [2023]  INFO RPI pisp.cpp:695 libpisp version v1.0.6 b567f0455680 17-06-2024 (10:20:00)
[0:02:04.924577790] [2023]  INFO RPI pisp.cpp:1154 Registered camera /base/axi/pcie@120000/rp1/i2c@88000/imx708@1a to CFE device /dev/media1 and ISP device /dev/media0 using PiSP variant BCM2712_C0
picamera2.picamera2 INFO: Initialization successful.
picamera2.picamera2 INFO: Camera now open.
picamera2.picamera2 DEBUG: <libcamera._libcamera.CameraManager object at 0x7fff1fca93f0>
>>> picam2.start_and_capture_file("test.jpg")
[0:02:10.324684140] [2013]  WARN V4L2 v4l2_pixelformat.cpp:344 Unsupported V4L2 pixel format RPBP
picamera2.picamera2 DEBUG: Requesting configuration: {'use_case': 'preview', 'buffer_count': 4, 'transform': <libcamera.Transform 'identity'>, 'display': 'main', 'encode': 'main', 'colour_space': <libcamera.ColorSpace 'sYCC'>, 'controls': <Controls: {'NoiseReductionMode': <NoiseReductionModeEnum.Minimal: 3>, 'FrameDurationLimits': (100, 83333)}>, 'main': {'size': (640, 480), 'format': 'XBGR8888', 'stride': 2560, 'framesize': 1228800}, 'lores': None, 'raw': {'size': (1536, 864), 'format': 'BGGR_PISP_COMP1', 'stride': 1536, 'framesize': 1327104}, 'queue': True, 'sensor': {'bit_depth': 10, 'output_size': (1536, 864)}}
picamera2.picamera2 INFO: Camera configuration has been adjusted!
[0:02:10.326091635] [2013]  INFO Camera camera.cpp:1183 configuring streams: (0) 640x480-XBGR8888 (1) 1536x864-BGGR_PISP_COMP1
[0:02:10.326338868] [2023]  INFO RPI pisp.cpp:1450 Sensor: /base/axi/pcie@120000/rp1/i2c@88000/imx708@1a - Selected sensor format: 1536x864-SBGGR10_1X10 - Selected CFE format: 1536x864-PC1B
picamera2.picamera2 INFO: Configuration successful!
picamera2.picamera2 DEBUG: Final configuration: {'use_case': 'preview', 'buffer_count': 4, 'transform': <libcamera.Transform 'identity'>, 'display': 'main', 'encode': 'main', 'colour_space': <libcamera.ColorSpace 'sYCC'>, 'controls': <Controls: {'NoiseReductionMode': <NoiseReductionModeEnum.Minimal: 3>, 'FrameDurationLimits': (100, 83333)}>, 'main': {'size': (640, 480), 'format': 'XBGR8888', 'stride': 2560, 'framesize': 1228800}, 'lores': None, 'raw': {'size': (1536, 864), 'format': 'BGGR_PISP_COMP1', 'stride': 1536, 'framesize': 1327104}, 'queue': True, 'sensor': {'bit_depth': 10, 'output_size': (1536, 864)}}
picamera2.picamera2 DEBUG: Streams: {'main': <libcamera._libcamera.Stream object at 0x7fff0d9c7270>, 'lores': None, 'raw': <libcamera._libcamera.Stream object at 0x7fff0d9c6970>}
picamera2 DEBUG: Allocated 4 buffers for stream 0 with fds [35, 38, 41, 44]
picamera2 DEBUG: Allocated 4 buffers for stream 1 with fds [47, 50, 53, 56]

After this it just stopped... So I tried again with a v2 camera and got this

Python 3.11.2 (main, Mar 13 2023, 12:18:29) [GCC 12.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from picamera2 import Picamera2
>>> picam2 = Picamera2()
[0:11:06.224905392] [2043]  INFO Camera camera_manager.cpp:284 libcamera v0.2.0+120-eb00c13d
[0:11:06.236794684] [2049]  INFO RPI pisp.cpp:695 libpisp version v1.0.6 b567f0455680 17-06-2024 (10:20:00)
[0:11:06.272370505] [2049]  INFO RPI pisp.cpp:1154 Registered camera /base/axi/pcie@120000/rp1/i2c@88000/imx219@10 to CFE device /dev/media0 and ISP device /dev/media2 using PiSP variant BCM2712_C0
[0:11:06.274088491] [2043]  INFO Camera camera_manager.cpp:284 libcamera v0.2.0+120-eb00c13d
[0:11:06.285950728] [2056]  INFO RPI pisp.cpp:695 libpisp version v1.0.6 b567f0455680 17-06-2024 (10:20:00)
[0:11:06.319488755] [2056]  INFO RPI pisp.cpp:1154 Registered camera /base/axi/pcie@120000/rp1/i2c@88000/imx219@10 to CFE device /dev/media0 and ISP device /dev/media2 using PiSP variant BCM2712_C0
>>> picam2.start_and_capture_file("test.jpg")
[0:11:12.491131810] [2043]  WARN V4L2 v4l2_pixelformat.cpp:344 Unsupported V4L2 pixel format RPBP
[0:11:12.492143403] [2043]  INFO Camera camera.cpp:1183 configuring streams: (0) 640x480-XBGR8888 (1) 640x480-BGGR_PISP_COMP1
[0:11:12.492376343] [2056]  INFO RPI pisp.cpp:1450 Sensor: /base/axi/pcie@120000/rp1/i2c@88000/imx219@10 - Selected sensor format: 640x480-SBGGR10_1X10 - Selected CFE format: 640x480-PC1B
Exception in thread Thread-2 (thread_func):
Traceback (most recent call last):
  File "/usr/lib/python3.11/threading.py", line 1038, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.11/threading.py", line 975, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib/python3/dist-packages/picamera2/previews/null_preview.py", line 29, in thread_func
    callback(picam2)
  File "/usr/lib/python3/dist-packages/picamera2/previews/drm_preview.py", line 83, in handle_request
    picam2.process_requests(self)
  File "/usr/lib/python3/dist-packages/picamera2/picamera2.py", line 1281, in process_requests
    display.render_request(display_request)
  File "/usr/lib/python3/dist-packages/picamera2/previews/drm_preview.py", line 74, in render_request
    self.render_drm(self.picam2, completed_request)
  File "/usr/lib/python3/dist-packages/picamera2/previews/drm_preview.py", line 158, in render_drm
    raise RuntimeError("Failed to reserve DRM plane")
RuntimeError: Failed to reserve DRM plane

Finally I dug out an older but working picamera2 I had on another sdcard and running the same code (without the debug) this is 0.3.17-1

Python 3.11.2 (main, Mar 13 2023, 12:18:29) [GCC 12.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from picamera2 import Picamera2
>>> picam2 = Picamera2()
[0:07:19.986709186] [3487]  INFO Camera camera_manager.cpp:284 libcamera v0.2.0+46-075b54d5
[0:07:20.021358229] [3490]  WARN RPiSdn sdn.cpp:39 Using legacy SDN tuning - please consider moving SDN inside rpi.denoise
[0:07:20.023639494] [3490]  INFO RPI vc4.cpp:447 Registered camera /base/soc/i2c0mux/i2c@1/imx708@1a to Unicam device /dev/media1 and ISP device /dev/media0
[0:07:20.023715399] [3490]  INFO RPI pipeline_base.cpp:1144 Using configuration file '/usr/share/libcamera/pipeline/rpi/vc4/rpi_apps.yaml'
[0:07:20.026278545] [3487]  INFO Camera camera_manager.cpp:284 libcamera v0.2.0+46-075b54d5
[0:07:20.061569810] [3493]  WARN RPiSdn sdn.cpp:39 Using legacy SDN tuning - please consider moving SDN inside rpi.denoise
[0:07:20.063817391] [3493]  INFO RPI vc4.cpp:447 Registered camera /base/soc/i2c0mux/i2c@1/imx708@1a to Unicam device /dev/media1 and ISP device /dev/media0
[0:07:20.063891741] [3493]  INFO RPI pipeline_base.cpp:1144 Using configuration file '/usr/share/libcamera/pipeline/rpi/vc4/rpi_apps.yaml'
>>> picam2.start_and_capture_file("test.jpg")
[0:07:25.907053470] [3487]  INFO Camera camera.cpp:1183 configuring streams: (0) 640x480-XBGR8888 (1) 1536x864-SBGGR10_CSI2P
[0:07:25.908055810] [3493]  INFO RPI vc4.cpp:611 Sensor: /base/soc/i2c0mux/i2c@1/imx708@1a - Selected sensor format: 1536x864-SBGGR10_1X10 - Selected unicam format: 1536x864-pBAA
commit failed
commit failed
[0:07:27.071959931] [3497]  INFO Camera camera.cpp:1183 configuring streams: (0) 4608x2592-BGR888 (1) 4608x2592-SBGGR10_CSI2P
[0:07:27.076532361] [3493]  INFO RPI vc4.cpp:611 Sensor: /base/soc/i2c0mux/i2c@1/imx708@1a - Selected sensor format: 4608x2592-SBGGR10_1X10 - Selected unicam format: 4608x2592-pBAA
[0:07:27.870210299] [3497]  INFO Camera camera.cpp:1183 configuring streams: (0) 640x480-XBGR8888 (1) 1536x864-SBGGR10_CSI2P
[0:07:27.875903895] [3493]  INFO RPI vc4.cpp:611 Sensor: /base/soc/i2c0mux/i2c@1/imx708@1a - Selected sensor format: 1536x864-SBGGR10_1X10 - Selected unicam format: 1536x864-pBAA

So it worked and I got my test.jpg where the other times in 0.3.19 i did not? Or is it the latest libcamera?...