camera/roundtrip-qrcode_vchiq failed due to PiCamera out of resources

[nancyc12]

Bug Description

camera/roundtrip-qrcode_vchiq failed on rpi4b4g, not sure if it relates to low memory issue as #1670.

Cert-blocker Test Case

• cert-blocker

To Reproduce

1. Launch the Jenkins job for the given device.

Expected Result

Test passes

Actual Result

Test failed with picamera.exc.PiCameraMMALError: Failed to enable connection: Out of resources

Environment

• Checkbox Type: Snap
• Checkbox Version: 4.3.0-dev44
• OS: UC 20

Relevant log output

Testing device name: vchiq

Input string: xpqAEOvDuD
Generating QR code...
Displaying on screen
Capture image of screen
mmal: mmal_vc_port_enable: failed to enable port vc.null_sink:in:0(OPQV): ENOSPC
mmal: mmal_port_enable: failed to enable connected port (vc.null_sink:in:0(OPQV))0xe495e0 (ENOSPC)
mmal: mmal_connection_enable: output port couldn't be enabled
Traceback (most recent call last):
  File "/tmp/nest-ec5wzv4w.16427a450e537741fc47ed5c55f4b9235c8cabe69831215cfcd65732683b2462/roundtrip_qr.py", line 128, in <module>
    main()
  File "/tmp/nest-ec5wzv4w.16427a450e537741fc47ed5c55f4b9235c8cabe69831215cfcd65732683b2462/roundtrip_qr.py", line 113, in main
    file = capture_rpi(name)
  File "/tmp/nest-ec5wzv4w.16427a450e537741fc47ed5c55f4b9235c8cabe69831215cfcd65732683b2462/roundtrip_qr.py", line 40, in capture_rpi
    with picamera.PiCamera() as camera:
  File "/snap/checkbox/11863/checkbox-runtime/lib/python3.8/site-packages/picamera/camera.py", line 433, in __init__
    self._init_preview()
  File "/snap/checkbox/11863/checkbox-runtime/lib/python3.8/site-packages/picamera/camera.py", line 512, in _init_preview
    self._preview = PiNullSink(
  File "/snap/checkbox/11863/checkbox-runtime/lib/python3.8/site-packages/picamera/renderers.py", line 558, in __init__
    self.renderer.inputs[0].connect(source).enable()
  File "/snap/checkbox/11863/checkbox-runtime/lib/python3.8/site-packages/picamera/mmalobj.py", line 2210, in enable
    mmal_check(
  File "/snap/checkbox/11863/checkbox-runtime/lib/python3.8/site-packages/picamera/exc.py", line 184, in mmal_check
    raise PiCameraMMALError(status, prefix)
picamera.exc.PiCameraMMALError: Failed to enable connection: Out of resources

Additional context

No response

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The internal ticket has been created: https://warthogs.atlassian.net/browse/CHECKBOX-1724.

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