Looks like the sawdust from a borer, like a powder post beetle. What is your location?

This is from my good friend’s avocado. It is in San Diego, California.

Could be polyphagous shot hole borer. Avocados are a host for them. You have to scrape off the white stuff (sugary exudate) to see how big the hole is. That will help identify the pest.

https://ucanr.edu/sites/pshb/id-mgmt/

Yes, that's exactly why we need a location. That shot hole borer is a big pest in that part of California.