Note: Google Test filter = GaneshAsyncReadbackUninitTest.*
[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from GaneshAsyncReadbackUninitTest
[ RUN      ] GaneshAsyncReadbackUninitTest.FailedInstantiationDeliversUninitializedBuffer
[setup] GL_VERSION  = OpenGL ES 3.0 (ANGLE 2.1.27757 git hash: 336e9a1b87e5)
[setup] GL_RENDERER = ANGLE (Google, Vulkan 1.3.0 (SwiftShader Device (Subzero) (0x0000C0DE)), SwiftShader driver-5.0.0)
[phase1] control readback (white surface) Y[0..15] = ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 
[phase1] control readback (white surface) U[0..15] = 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 

[phase2] *** UNINITIALISED TRANSFER BUFFER DELIVERED TO CLIENT ***
  GrResourceAllocator::assign() failed (promise fulfil returned null, calls=1)
  yet asyncRescaleAndReadPixelsYUV420 returned a non-null result.
  Surface was cleared to WHITE, expected Y plane = all 0xFF.
  Actual Y[0..63]  = 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  Actual U[0..31]  = 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  Actual V[0..31]  = 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  (rowBytes Y=64)
  Y-plane row0: 64/64 bytes != expected 0xFF -> client received buffer never written by GrTransferFromRenderTask.
  On this GL driver the unwritten bytes happen to read as 0x00; on
  production Vulkan+VMA they are recycled sub-allocations holding a
  *previous origin's* readback pixels (cross-origin info leak).

[       OK ] GaneshAsyncReadbackUninitTest.FailedInstantiationDeliversUninitializedBuffer (158 ms)
[----------] 1 test from GaneshAsyncReadbackUninitTest (158 ms total)

[----------] Global test environment tear-down
[==========] 1 test from 1 test suite ran. (158 ms total)
[  PASSED  ] 1 test.