Specify a concrete stack size in channel tests #138720
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The channel-stack-overflow-issue-102246 regression test fails on platforms with a small default stack size (e.g. Fuchsia, with a default of 256KiB). Update the test to specify an exact stack size for both the sender and receiver operations, to ensure it is platform agnostic. Set the stack size to less than the total allocation size of the mpsc channel, to continue to prove that the allocation is on the heap.
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The channel-stack-overflow-issue-102246 regression test fails on platforms with a small default stack size (e.g. Fuchsia, with a default of 256KiB). Update the test to specify an exact stack size for both the sender and receiver operations, to ensure it is platform agnostic.
Set the stack size to less than the total allocation size of the mpsc channel, to continue to prove that the allocation is on the heap.