Diagnosing and Fixing Isolate Deadlocks in Dart Applications
A step‑by‑step diagnostic guide for spotting and resolving Dart isolate deadlocks, with concrete verification code, ordered checks, targeted fixes, and escalation paths.
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V8 SnapshotCreator pause: can heap serialization happen without stopping the isolate?
I'm evaluating V8's snapshot API ( v8::SnapshotCreator / SnapshotBlob ) as a way to migrate a small embedded JavaScript application from one process to another with no observable downtime. The plan is to serialize the isolate's heap, ship the blob to a new process, and resume execution there. From the documented behavior, snapshot creation appears to require
Change in Isolate.kill() behavior leaves finalizers unrun on uncaught asynchronous errors
Goal Verify whether the Dart VM executes an isolate’s finalizers when the isolate terminates because of an uncaught asynchronous error, and determine which native memory or thread resources may remain allocated. Constraint In Dart SDK 2.19 and later, Isolate.kill() triggers a graceful shutdown that runs finalizers and releases native memory. However, the VM’
Does V8’s Isolate::TerminateExecution cancel pending timers and promise reactions?
When a host invokes V8’s Isolate::TerminateExecution to enforce a timeout, the API halts the running script and clears the current microtask queue. However, the specification does not state whether timers ( setTimeout / setInterval ) or promise reactions that have already been queued but not yet executed are also cancelled. Clarifying this behavior is import
v8Vitest isolate false cross-file module state cleanup boundary
Goal: Run multiple test files in the same Vitest worker while keeping isolate: false for faster startup, without shared module state leaking between files. Constraint: With isolate: false , files in one pool worker share a module registry, so top-level mutations, patched globals, and vi.mock registrations can persist into later files. Vitest does not automat