[Ruby 1.8.7] Segmentation fault / stack level too deep
While playing around with the possibility of a simpler AOP library for ruby than Aquarium (and without using ParseTree), I've found a very strange segmentation fault. The attached code file shows it happing. As it is very exploratory code, it is filled with some very unusual meta-programming that, when cleaned up with proper modularization, prevent the bug from happening.
What is weird is that commenting a few lines of the code change the segmentation fault into the following error:
meta_define_inline_blockeasy_seg_fault.rb:46:in `new': stack level too deep (SystemStackError)
The commented lines are marked in the file, but I repeate them for completeness sake:
## Commenting the following two lines the seg fault turn into `new': stack level too deep
regex = /#<Module:0x(\w+)/
uniquename = regex.match(to_s)
Not a big issue, as the real library will not open Class and redefine new, but I found interestnig. And worried, since seg faults can sometimes be exploited into bigger issues.
Updated by danielribeiro (Daniel Ribeiro) over 10 years ago
Just tried on a newer patch of ruby 1.8.7:
$ ruby -v
ruby 1.8.7 (2009-04-08 patchlevel 160) [i686-linux]
The difference is that commenting the highlighted lines does not change the error from "seg fault" to "stack level too deep" anymore.