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G-API: sporadic failures in GAPI_Streaming_Desync.* tests #18773

@alalek

Description

@alalek

Observed on different configurations in nightly builds. Some of them are below:

[ RUN      ] GAPI_Streaming_Desync.UseSpecialPull
/build/master_openvino-opencl-skx-lin64/opencv/modules/gapi/test/streaming/gapi_streaming_tests.cpp:1359: Failure
Expected equality of these values:
  100u
    Which is: 100
  num_frames
    Which is: 99
[  FAILED  ] GAPI_Streaming_Desync.UseSpecialPull (146 ms)
[ RUN      ] GAPI_Streaming_Desync.SmokeTest_Streaming
[ INFO:0] global /build/master_coverage-lin64-debug/opencv/modules/gapi/src/compiler/passes/kernels.cpp (255) expandKernels Final graph: 15 nodes

[ INFO:0] global /build/master_coverage-lin64-debug/opencv/modules/gapi/src/compiler/passes/exec.cpp (636) fuseGeneral island_#0x55b98dde2490 can be merged into island_#0x55b98e38e6b0
[ INFO:0] global /build/master_coverage-lin64-debug/opencv/modules/gapi/src/compiler/passes/exec.cpp (656) fuseGeneral merge(island_#0x55b98e38e6b0,island_#0x55b98dde2490) was successful!
[ INFO:0] global /build/master_coverage-lin64-debug/opencv/modules/gapi/src/compiler/passes/exec.cpp (636) fuseGeneral island_#0x55b98e38e310 can be merged into island_#0x55b98de349c0
[ INFO:0] global /build/master_coverage-lin64-debug/opencv/modules/gapi/src/compiler/passes/exec.cpp (656) fuseGeneral merge(island_#0x55b98de349c0,island_#0x55b98e38e310) was successful!
[ INFO:0] global /build/master_coverage-lin64-debug/opencv/modules/gapi/src/compiler/passes/exec.cpp (636) fuseGeneral island_#0x55b98e38e9e0 can be merged into island_#0x55b98e3a72d0
[ INFO:0] global /build/master_coverage-lin64-debug/opencv/modules/gapi/src/compiler/passes/exec.cpp (647) fuseGeneral merge(island_#0x55b98e3a72d0,island_#0x55b98e38e9e0) caused cycle, rolling back...
[ INFO:0] global /build/master_coverage-lin64-debug/opencv/modules/gapi/src/compiler/passes/exec.cpp (636) fuseGeneral island_#0x55b98de34dc0 can be merged into island_#0x55b98e3a72d0
[ INFO:0] global /build/master_coverage-lin64-debug/opencv/modules/gapi/src/compiler/passes/exec.cpp (656) fuseGeneral merge(island_#0x55b98e3a72d0,island_#0x55b98de34dc0) was successful!
[ INFO:0] global /build/master_coverage-lin64-debug/opencv/modules/gapi/src/compiler/passes/exec.cpp (636) fuseGeneral island_#0x55b98e38e9e0 can be merged into island_#0x55b98de335f0
[ INFO:0] global /build/master_coverage-lin64-debug/opencv/modules/gapi/src/compiler/passes/exec.cpp (656) fuseGeneral merge(island_#0x55b98de335f0,island_#0x55b98e38e9e0) was successful!
[ INFO:0] global /build/master_coverage-lin64-debug/opencv/modules/gapi/src/compiler/gcompiler.cpp (401) runPasses All compiler passes are successful
/build/master_coverage-lin64-debug/opencv/modules/gapi/test/streaming/gapi_streaming_tests.cpp:1174: Failure
Expected equality of these values:
  100u
    Which is: 100
  out1_hits
    Which is: 99
Got 99 out1's and 98 out2's
[  FAILED  ] GAPI_Streaming_Desync.SmokeTest_Streaming (5275 ms)
[ RUN      ] GAPI_Streaming_Desync.UseSpecialPull
/build/master_opt-avx2_noICV-skl-lin64-clang/opencv/modules/gapi/test/streaming/gapi_streaming_tests.cpp:1359: Failure
Expected equality of these values:
  100u
    Which is: 100
  num_frames
    Which is: 99
[  FAILED  ] GAPI_Streaming_Desync.UseSpecialPull (164 ms)

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