Bug #9589: Stack level too deep during eval causes segmentation fault

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: 1.9.3

[carlosayam (carlos aya)]

The following silly code, which imho should generate a " stack level too deep (SystemStackError)", segfaults

$ echo 'eval($)' | ruby -n -e 'eval($)'

I thought it may be a bug, not sure.

My version:
carlos-mac$ ruby -v
ruby 1.9.3p327 (2012-11-10) [x86_64-darwin12.2.0]

[Cezary (Cezary Baginski)]

Not sure if it's related, but I'm getting segfaults instead of SystemStackErrors with recursive lambda calls from:

example_spec.rb:

describe Fixnum do subject { subject } it { should be } end

by running:

rspec example_spec.rb

using this version of rspec:

rspec (2.14.1) rspec-core (2.14.8)

Both on:

ruby 2.1.1p76 (2014-02-24 revision 45161) [x86_64-linux]

and:

ruby 2.2.0dev (2014-03-04 trunk 45264) [x86_64-linux]

but the debug build of 2.2.0 (-O0 and -ggdb3) gives SystemStackError as expected.

(all examples compiled with gcc (Ubuntu/Linaro 4.7.3-1ubuntu1) 4.7.3)

[carlosayam (carlos aya)]

Interesting, I searched the rspec-core code and it uses instance_eval/class_eval. That prompted me to try these faulty snippets...

b = Proc.new do b.instance_eval(&b) end b.instance_eval(&b)

and this one too...

b = Proc.new do Proc.class_eval(&b) end Proc.class_eval(&b)

Both segfault. I suspect eval, instance_eval and class_eval are not guarded against stack errors (again v.1.9.3 not sure about 2.x).

[runephilosof (Rune Philosof)]

This bug should be against the newest ruby stable 2.1.2, but I cannot change that.
I just encountered it in a spec that looks like this:
require 'spec_helper'

describe "test" do
let(:die) { "this is fine" }
context "with bad context" do
let(:die) { die + ", but this will fail" }
it "it throws segmentation fault" do
expect { die }.to raise_error("Segmentation Fault")
end
end
end

This is with ruby 2.1.2 and rspec-core 2.14.8

[decuplet (Nikita Shilnikov)]

This command fails with segfault on 2.1.1 and 2.1.2:
ruby -e 'define_method(:bar) {send(:bar)}; bar'
It's OK on 2.0.0 and below.

[jeremyevans0 (Jeremy Evans)]

• Status changed from Open to Closed
• Backport deleted (1.9.3: UNKNOWN, 2.0.0: UNKNOWN, 2.1: UNKNOWN)

From my testing with class Object; define_method(:bar) {send(:bar)}; bar end:

1.9-2.1: SystemStackError
2.2-2.4: segfault
2.5-master: SystemStackError

As this issue appears to have been fixed, closing. If you can reproduce with a currently supported Ruby version, please post back here.