Bug #3143

[Ruby 1.8.7] Segmentation fault / stack level too deep

Added by danielribeiro (Daniel Ribeiro) about 9 years ago. Updated almost 8 years ago.

ruby -v:
ruby 1.8.7 (2008-08-11 patchlevel 72) [i486-linux]


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)[1]

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.


easy_seg_fault.rb (1.28 KB) easy_seg_fault.rb Ruby file showing the bug danielribeiro (Daniel Ribeiro), 04/14/2010 12:01 AM



Updated by danielribeiro (Daniel Ribeiro) about 9 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.


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