[TSan] Do not report benign race on _swiftEmptyArrayStorage
#28529
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A previous commit [1] identified and fixed a benign race on `_swiftEmptyArrayStorage`. Unfortunately, we have some code duplication and the fix was not applied to all the necessary places. Essentially, we need to ensure that the "empty array storage" object that backs many "array like types" is never written to. I tried to improve the test to capture this, however, it is very finicky. Currently, it does not go red on my system even when I remove the check to avoid the benign race in Release mode. Relevant classes: Array, ArraySlice, ContiguousArray, ArrayBuffer, ContiguousArrayBuffer, SliceBuffer. [1] b9b4c78 rdar://55161564 (cherry picked from commit 381dcc2)
Remove the argument label to reduce the verbosity in the test. (cherry picked from commit ada44cb)
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@swift-ci Please test |
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Build failed |
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@swift-ci Please test Linux |
mikeash
approved these changes
Dec 3, 2019
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@apple/swift5-branch-managers |
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It's too late in the integration cycle. |
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Cherry-picks for rdar://55161564 (Unexpected TSAN error against _swiftEmptyArrayStorage).
#27808