14b : Gzeirah Shava lo gamar. Rashi says Reish Lakish didn't hear it from his Rebbi, Rabi Yochanan, so he could not learn the gzeira shava.. But Rabi Yochanan was the Rebbi of Reish Lakish! See Bava Metzia 84a.
The book Mareh Hamakom on Makos answers on p. 171 that Tosfos in B"M there, and Yevamos 57a s.v. asa says that Reish Lakish originally learned Torah from Rav Oshia, then he became a bandit, then Rabi Yochanan convinced hm to leave banditry and return to Torah. So Rabi
Yochanan wasn't Reish Lakish's only Rebbi. (To Rashi, who holds holds Reish Lakish was a bandit from his youth and didn't learn Torah until he encountered Rabi Yochanan, I don't know how to answer this question.)