This website, of dubious reliability, claims that Adi Shankaracharya lost in a debate against the Buddhist philosopher Vasubandhu:
Towards the end of his short life, defeated in debate by the Buddhist Mahapandita Vasubandhu, Adi Shankaracharya was compelled to embrace Buddhism once again, as was the norm then. He died out of the sheer shame of his defeat!
My question isn't about the claim concerning how he died; I'm pretty sure that at least Hindu sources say that he died by merging into the famous Lingam at Kedarnath to attain Moksha.
But I'm wondering whether it's true that Adi Shankaracharya had a debate with Vasubandhu. Are there any records of such a debate? If so, what were the points debated and what was the result? I highly doubt that the result would have been Adi Shankaracharya being forced to accept Buddhism.