/path/to/.rvm/gems/ruby-1.9.3-p194@nameofgemset/gems/json-1.7.3/lib/json/ext/parser.bundle: [BUG] Segmentation fault ruby 1.8.7 (2010-04-19 patchlevel 253) [i686-darwin10.3.0], MBARI 0x6770, Ruby Enterprise Edition 2010.02

Error message:
/path/to/.rvm/gems/ruby-1.9.3-p194@nameofgemset/gems/json-1.7.3/lib/json/ext/parser.bundle: [BUG] Segmentation fault ruby 1.8.7 (2010-04-19 patchlevel 253) [i686-darwin10.3.0], MBARI 0x6770, Ruby Enterprise Edition 2010.02


Problem:
In my case the JSON gem has a compiled extension that might've been corrupted or rendered incompatible. I'm guessing this because of the error message in the passenger log file (error message above). This is possible for other gems as well not just JSON, basically any gem that requires a compiled extension.


Fix:
There are multiple possible fixes.
1. `gem install json`
2. (the one that worked for me) rebuild all gems with `gem pristine --all`


Good luck and hope this helps.