Bug #3690: method_missing in a BasicObject's singleton class - infinite recursion segfaults

• Status: Rejected
• Assignee: -
• Target version: -
• ruby -v: ruby 1.9.3dev (2010-05-26 trunk 28028) [i686-linux]

[rbjl (Jan Lelis)]

=begin

segfaults with all versions that I tested (1.9.3, 1.9.2, 1.9.1)

obj = BasicObject.new

def obj.method_missing(m, *args, &block)
send( m, *args, &block )
end

puts obj.seg
=end

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Rejected

=begin
Yes, it does recurse infinitely with any objects.
That's what you code does.

=end

[rbjl (Jan Lelis)]

=begin
But it does not throw a SystemStackError
=end

[RickDeNatale (Rick DeNatale)]

=begin
Well it does on my Mac

→ rvm use 1.9.2
Using ruby 1.9.2 preview1

~
→ ruby -e'obj = BasicObject.new
quote>
quote> def obj.method_missing(m, *args, &block)
quote> send( m, *args, &block )
quote> end
quote>
quote> puts obj.seg'
-e:4:in method_missing': stack level too deep (SystemStackError) from -e:4:in method_missing'
from -e:4:in method_missing' from -e:4:in method_missing'
from -e:4:in method_missing' from -e:4:in method_missing'
from -e:4:in method_missing' from -e:4:in method_missing'
from -e:4:in method_missing' ... 1253 levels... from -e:4:in method_missing'
from -e:4:in method_missing' from -e:4:in method_missing'
from -e:7:in `'

=end

[runpaint (Run Paint Run Run)]

• File segfault segfault added

=begin
I can reproduce on ruby 1.9.3dev (2010-08-13 trunk 28973) [i686-linux] with the OP's script. Attached the output.
=end

[Eregon (Benoit Daloze)]

=begin
On 14 August 2010 17:34, Jan Lelis [e-mail] wrote:

Issue #3690 has been updated by Jan Lelis.

But it does not throw a SystemStackError

At me (OS X), it depends quite much.
(ruby 1.9.3dev (2010-08-13) [x86_64-darwin10.4.0], ruby 1.9.2dev
(2010-08-09 revision 28936) [x86_64-darwin10.4.0])

Running with 1.9.{2,3} as a script produce a SystemStackError.

However, sometimes, running in IRB or with 'GC.stress = true' cause
segfault, with 1.9.3.

So it is a 1.9.3-specific problem at me. (1.9.2 with GC.stress take a
while so I suppose there is no problem)

B.D.

=end

[rbjl (Jan Lelis)]

• File seg.txt seg.txt added

=begin

=end