W/libc: Unable to set property "debug.sf.dequeuebuffer" to "1": connection failed; errno=13

[mansourmoufid]

I am using the camera2 API.

When my library exports the symbol "dump_buffer", ACameraCaptureSession fails and onCaptureFailed is called with the reason CAPTURE_FAILURE_REASON_ERROR.

In logcat I see this:

W/libc: Unable to set property "debug.sf.dequeuebuffer" to "1": connection failed; errno=13 (Permission denied)
E/BufferQueueProducer: [ImageReader-1088x1088f23u3m1-22596-0](id:584400000000,api:4,p:823,c:22596) waitForFreeSlotThenRelock: timeout

I can reliably trigger this by adding or removing "dump_buffer":

__attribute__((visibility(default))) void dump_buffer(void) {}

The solution is to just remove or rename "dump_buffer".

Leaving this here in case anyone else stumbles on it. The cause is not obvious from the errors (I figured it out by total accident).

[mansourmoufid]

cc @ChathuragaShan (https://stackoverflow.com/questions/67145610/camera-2-preview-freezes-when-i-uses-yuv-420-888-image-reader-as-a-target-surfac)

cc @trueinnidhi (flutter/flutter#94232)

[enh-google]

debug.sf.dequeuebuffer isn't referenced in AOSP or internal master... so this is either something in your code (if you're an OEM/SoC vendor), or something specific to whatever device you're running on?