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Intermittent timeout in /_webgl/conformance/reading/read-pixels-test.html #28337

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Description

@pecastro

From: https://github.com/servo/servo/pull/28328/checks?check_run_id=2269496988

2021-04-05T11:57:00.5837367Z   ▶ TIMEOUT [expected OK] b'/_webgl/conformance/reading/read-pixels-test.html'
2021-04-05T11:57:00.5839268Z   │ 
2021-04-05T11:57:00.5840263Z   │ error: XDG_RUNTIME_DIR not set in the environment.
2021-04-05T11:57:00.5841607Z   │ libEGL warning: No hardware driver found, falling back to software rendering
2021-04-05T11:57:00.5842939Z   │ DESCRIPTION: Checks that ReadPixels works as expected.
2021-04-05T11:57:00.5844363Z   │ 
2021-04-05T11:57:00.5845184Z   │ checking: in range
2021-04-05T11:57:00.5846221Z   │ PASS color pixel at 0, 0 should be about 51,153,102,255, was = 51,153,102,255
2021-04-05T11:57:00.5847355Z   │ PASS color pixel at 1, 0 should be about 51,153,102,255, was = 51,153,102,255
2021-04-05T11:57:00.5848480Z   │ PASS color pixel at 0, 1 should be about 51,153,102,255, was = 51,153,102,255
2021-04-05T11:57:00.5849592Z   │ PASS color pixel at 1, 1 should be about 51,153,102,255, was = 51,153,102,255
2021-04-05T11:57:00.5850448Z   │ 
2021-04-05T11:57:00.5851229Z   │ checking: off top left
2021-04-05T11:57:00.5852263Z   │ PASS color pixel at 0, 0 should be about 19,72,0,198, was = 19,72,0,198
2021-04-05T11:57:00.5853397Z   │ PASS color pixel at 1, 0 should be about 19,72,0,198, was = 19,72,0,198
2021-04-05T11:57:00.5854494Z   │ PASS color pixel at 0, 1 should be about 19,72,0,198, was = 19,72,0,198
2021-04-05T11:57:00.5855634Z   │ PASS color pixel at 1, 1 should be about 51,153,102,255, was = 51,153,102,255
2021-04-05T11:57:00.5856482Z   │ 
2021-04-05T11:57:00.5857298Z   │ checking: off bottom right
2021-04-05T11:57:00.5858338Z   │ PASS color pixel at 0, 0 should be about 51,153,102,255, was = 51,153,102,255
2021-04-05T11:57:00.5859452Z   │ PASS color pixel at 1, 0 should be about 19,72,0,198, was = 19,72,0,198
2021-04-05T11:57:00.5861733Z   │ PASS color pixel at 0, 1 should be about 19,72,0,198, was = 19,72,0,198
2021-04-05T11:57:00.5865196Z   │ PASS color pixel at 1, 1 should be about 19,72,0,198, was = 19,72,0,198
2021-04-05T11:57:00.5865812Z   │ 
2021-04-05T11:57:00.5866408Z   │ checking: completely off top
2021-04-05T11:57:00.5867240Z   │ PASS color pixel at 0, 0 should be about 19,72,0,198, was = 19,72,0,198
2021-04-05T11:57:00.5868139Z   │ PASS color pixel at 1, 0 should be about 19,72,0,198, was = 19,72,0,198
2021-04-05T11:57:00.5868993Z   │ PASS color pixel at 0, 1 should be about 19,72,0,198, was = 19,72,0,198
2021-04-05T11:57:00.5869880Z   │ PASS color pixel at 1, 1 should be about 19,72,0,198, was = 19,72,0,198
2021-04-05T11:57:00.5870489Z   │ 
2021-04-05T11:57:00.5871093Z   │ checking: completely off bottom
2021-04-05T11:57:00.5871935Z   │ PASS color pixel at 0, 0 should be about 19,72,0,198, was = 19,72,0,198
2021-04-05T11:57:00.5872790Z   │ PASS color pixel at 1, 0 should be about 19,72,0,198, was = 19,72,0,198
2021-04-05T11:57:00.5873824Z   │ PASS color pixel at 0, 1 should be about 19,72,0,198, was = 19,72,0,198
2021-04-05T11:57:00.5874674Z   │ PASS color pixel at 1, 1 should be about 19,72,0,198, was = 19,72,0,198
2021-04-05T11:57:00.5875277Z   │ 
2021-04-05T11:57:00.5875890Z   │ checking: completely off left
2021-04-05T11:57:00.5876708Z   │ PASS color pixel at 0, 0 should be about 19,72,0,198, was = 19,72,0,198
2021-04-05T11:57:00.5877591Z   │ PASS color pixel at 1, 0 should be about 19,72,0,198, was = 19,72,0,198
2021-04-05T11:57:00.5879386Z   │ PASS color pixel at 0, 1 should be about 19,72,0,198, was = 19,72,0,198
2021-04-05T11:57:00.5880459Z   │ PASS color pixel at 1, 1 should be about 19,72,0,198, was = 19,72,0,198
2021-04-05T11:57:00.5881102Z   │ 
2021-04-05T11:57:00.5881721Z   │ checking: completeley off right
2021-04-05T11:57:00.5882553Z   │ PASS color pixel at 0, 0 should be about 19,72,0,198, was = 19,72,0,198
2021-04-05T11:57:00.5883416Z   │ PASS color pixel at 1, 0 should be about 19,72,0,198, was = 19,72,0,198
2021-04-05T11:57:00.5884263Z   │ PASS color pixel at 0, 1 should be about 19,72,0,198, was = 19,72,0,198
2021-04-05T11:57:00.5885112Z   │ PASS color pixel at 1, 1 should be about 19,72,0,198, was = 19,72,0,198
2021-04-05T11:57:00.5886096Z   │ PASS getError was expected value: NO_ERROR : there should be no GL errors
2021-04-05T11:57:00.5886944Z   │ 
2021-04-05T11:57:00.5887515Z   │ check invalid format or type
2021-04-05T11:57:00.5888639Z   │ FAIL getError expected: INVALID_ENUM. Was INVALID_OPERATION : Should not be able to read as DEPTH_COMPONENT
2021-04-05T11:57:00.5892883Z   │ FAIL getError expected: INVALID_ENUM. Was INVALID_OPERATION : Should not be able to read as DEPTH_STENCIL
2021-04-05T11:57:00.5894546Z   │ FAIL getError expected: INVALID_ENUM. Was INVALID_OPERATION : Should not be able to read as 0x8229
2021-04-05T11:57:00.5895865Z   │ FAIL getError expected: INVALID_ENUM. Was INVALID_OPERATION : Should not be able to read as RGBA4
2021-04-05T11:57:00.5897224Z   │ FAIL getError expected: INVALID_ENUM. Was INVALID_OPERATION : Should not be able to read as LUMINANCE
2021-04-05T11:57:00.5898626Z   │ FAIL getError expected: INVALID_ENUM. Was INVALID_OPERATION : Should not be able to read as LUMINANCE_ALPHA
2021-04-05T11:57:00.5899980Z   │ FAIL getError expected: INVALID_ENUM. Was INVALID_OPERATION : Should not be able to read as 0x1903
2021-04-05T11:57:00.5901305Z   │ FAIL getError expected: INVALID_ENUM. Was INVALID_OPERATION : Should not be able to read as 0x8228
2021-04-05T11:57:00.5902614Z   │ FAIL getError expected: INVALID_ENUM. Was INVALID_OPERATION : Should not be able to read as 0x8d99
2021-04-05T11:57:00.5903945Z   │ FAIL getError expected: INVALID_ENUM. Was INVALID_OPERATION : Should not be able to read as 0x84fa
2021-04-05T11:57:00.5905302Z   │ FAIL getError expected: INVALID_ENUM. Was INVALID_OPERATION : Should not be able to read as UNSIGNED_SHORT
2021-04-05T11:57:00.5906651Z   │ FAIL getError expected: INVALID_ENUM. Was INVALID_OPERATION : Should not be able to read as SHORT
2021-04-05T11:57:00.5907965Z   │ FAIL getError expected: INVALID_ENUM. Was INVALID_OPERATION : Should not be able to read as BYTE
2021-04-05T11:57:00.5909316Z   │ FAIL getError expected: INVALID_ENUM. Was INVALID_OPERATION : Should not be able to read as UNSIGNED_INT
2021-04-05T11:57:00.5910667Z   │ FAIL getError expected: INVALID_ENUM. Was INVALID_OPERATION : Should not be able to read as 0x8368
2021-04-05T11:57:00.5911492Z   │ 
2021-04-05T11:57:00.5912155Z   │ check invalid combinations of format/type
2021-04-05T11:57:00.5920223Z   │ PASS getError was expected value: NO_ERROR : Should be able to read as RGBA / UNSIGNED_BYTE
2021-04-05T11:57:00.5921843Z   │ PASS getError was expected value: INVALID_OPERATION : Should not be able to read as RGB / UNSIGNED_BYTE
2021-04-05T11:57:00.5923254Z   │ PASS getError was expected value: INVALID_OPERATION : Should not be able to read as RGB / UNSIGNED_SHORT_5_6_5
2021-04-05T11:57:00.5924678Z   │ PASS getError was expected value: INVALID_OPERATION : Should not be able to read as RGBA / UNSIGNED_SHORT_5_5_5_1
2021-04-05T11:57:00.5926084Z   │ PASS getError was expected value: INVALID_OPERATION : Should not be able to read as RGBA / UNSIGNED_SHORT_4_4_4_4
2021-04-05T11:57:00.5927494Z   │ PASS getError was expected value: INVALID_OPERATION : Should not be able to read as ALPHA / UNSIGNED_BYTE
2021-04-05T11:57:00.5928348Z   │ 
2021-04-05T11:57:00.5929394Z   │ check reading with lots of drawing
2021-04-05T11:57:00.5930162Z   │ PASS actual is expected
2021-04-05T11:57:00.5930820Z   │ PASS actual is expected
2021-04-05T11:57:00.5931471Z   │ PASS actual is expected
2021-04-05T11:57:00.5932555Z   │ PASS getError was expected value: NO_ERROR : there should be no GL errors
2021-04-05T11:57:00.5933303Z   │ 
2021-04-05T11:57:00.5933962Z   │ PASS successfullyParsed is true

From: https://github.com/servo/servo/runs/2266054990?check_suite_focus=true

2021-04-04T21:54:53.1621682Z   [1067/1576] /_webgl/conformance/reading/read-pixels-test.html

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