From what I have learnt about Permian extinction, the oceans were hit terribly hard by it due to ocean acidification, high temperature (who don’t retain oxygen that good) and lot of euxinic and anoxic zones. This would have been ideal for microbes who thrived in such situations.
So, how did the oceans got oxygenated again even after wide-scale euxinia, especially considering that oceans remained in such state throughout the boring billion?
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How did the oxygen get there in the first place? Not all of the oxygen-producing creatures were killed off. After millions of years, they had enough time to come back.
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