"v8 received signal SIGSEGV, Segmentation fault" after execution timeout and call V8::TerminateExecution()

[nebulasio]

"v8 received signal SIGSEGV, Segmentation fault" after execution timeout and call V8::TerminateExecution()

[fbzhong]

Find the root cause: V8Engine.Dispose() must not be called until C.RunScriptSource() return. Otherwise, it will crash.

The fix should be:

	done := make(chan bool, 1)

	go func() {
		ret = C.RunScriptSource(e.v8engine, cSource, C.uintptr_t(e.lcsHandler),
			C.uintptr_t(e.gcsHandler))
		done <- true
	}()

	select {
	case <-done:
		if ret != 0 {
			err = ErrExecutionFailed
		}
	case <-time.After(10 * time.Second):
		C.TerminateExecution(e.v8engine)
		err = ErrExecutionTimeout

		// wait for C.RunScriptSource() returns.
		select {
		case <-done:
		}
	}

[fbzhong]

This 04ad5c6 commit fix this crash bug.