5379edb62b
Detected by TSAN as a data race between the registration code and iteration code. Bug: https://github.com/dart-lang/sdk/issues/39611 Change-Id: Ic232e9382a775369ce5898f3c4e5a90e8c0160c0 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/139495 Reviewed-by: Martin Kustermann <kustermann@google.com> Commit-Queue: Ryan Macnak <rmacnak@google.com>