Profiling data:
IC2 Rubber Tree Endless Loop.zip

IC2 Rubber Trees generation stuck in endless loop and halt a client?

From what I saw in the profiling data I cannot determine if we have a loop or just recursive method calls. But yes it is stuck while generating rubber trees resulting in no chunks being generated to a stage at which they are saved

IC2's worldgen was coded to be suitable with other height extension mods hence this happens. Source: Barteks

Fixed in 30fc76e