I've written a patch to improve this by making the call thread sit on a dedicated single-thread thread pool. Seems to help locally under rr. Checking tsan on try [here](https://treeherder.mozilla.org/#/jobs?repo=try&revision=2c2dd8b68afc2d57224747b15d2c7afc4c948360).
Bug 1729366 Comment 4 Edit History
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I've written a patch to improve this by making the call thread sit on a dedicated single-thread thread pool. Seems to help locally under rr. Checking tsan on try [here](https://treeherder.mozilla.org/#/jobs?repo=try&revision=cb3652112ad5b3ff7513c5d8c695034a1166066d).