At the bottom of anv_GetSemaphoreFdKHR:

   /* From the Vulkan 1.0.53 spec:
    *
    *    "Export operations have the same transference as the specified handle
    *    type’s import operations. [...] If the semaphore was using a
    *    temporarily imported payload, the semaphore’s prior permanent payload
    *    will be restored.
    */
   if (impl == &semaphore->temporary)
      anv_semaphore_impl_cleanup(device, impl);

If this happens, the underlying semaphore resource is released but the semaphore type is not updated to NONE.  

So, on Destroy, the semaphore resource will be released again.

I think instead it should be:

    anv_semaphore_reset_temporary(device, semaphore);