My cloud sql instance is stuck in Restart sate for a very long time. In the operations pane, the status of the Restart is showing as pending, and there was also an export happening whose state is still Running .
Is there an way i can force the restart or cancel the restart or recover the data from the regular backup ?
No, there is no way. If you pay Google for a premier account, you will be able to log a support ticket and they'll look into it and probably fix it.
There's not many options you have, maybe try restarting again?