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• If the Debug Agent gets a BREAKPOINT event from JVMTI on a carrier thread, it will deliver that event to the debugger on the Fiber instead.
• If you single step in a Fiber, this results in the Debug Agent enabling single stepping on the Carrier Thread that the Fiber is running on. When the JVMTI delivers the SINGLE_STEP event to the Debug Agent on the Carrier Thread, it is relayed to the debugger on the Fiber instead of the Carrier Thread.

In the future, we may decide to allow debuggers to be Fiber aware, possibly allowing for improved fiber debugging support. This would also require changes to JDI, JDWP, the Debug Agent, and JVMTI. We expect these design decisions to be driven by a combination of debugger user needs and what debugger vendors are willing to implement support for.