[Rails] Ruby crashing: pointer being freed was not allocated

I starting seeing this error quite frequently the past couple of days:

$ rake routes
ruby(38294,0x7fff70ee6ca0) malloc: *** error for object 0x100000000:
pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
Abort trap

Rails server crashes, some rake tasks crash, but not consistently.

I have:
- removed ruby 1.9.2-p180 and reinstalled (via rvm)
- delete gemset and re-installed all gems

Any ideas why?

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