Thread safety and class methods

[cipher_neo]

Hey guys, 

using passenger, is it possible that there could be thread safety issues when executing a class method on a model?

I am seeing some weird data in some of my model instances and I think it may be to do with concurrent processing of a class method in a model.

Is this possible, that variables get shared between all threads of execution, when you are accessing a class method? 

#example

def self.somemethod

end