The bug
In a superflat world with soul soil, lava, and blue ice, replacing one blue ice block will cause all the generators to update. They will form in a straight line, preferring negative X, infinitely. The basalt for each generator forms at the same time, causing massive amounts of server lag. The updates are only stopped by unloaded chunks (not the worldborder, unlike cobblestone generators) and cause a recursive stacktrace to be printed.
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I disagree with this being a duplicate. The problem mainly lies in the fact that basalt generation isnβt dictated by something like fluid flow. Superflat generation is just one way to produce this bug, but simply having a non-updated row of basalt generators could cause this.