chore: merge 1.29.x into master #5839
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This patch fixes a bug where nesting `block_in_place` with a `block_on` between could lead to a panic. This happened because the nested `block_in_place` would try to acquire a core on return when it should not attempt to do so. The `block_on` between the two nested `block_in_place` altered the thread-local state to lead to the incorrect behavior. The fix is for each call to `block_in_place` to track if it needs to try to steal a core back. Fixes #5239
carllerche
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Noah-Kennedy
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Jun 29, 2023
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