Bug #9151: Segfault in Ruby head

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby-head
• Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN

[sam.saffron (Sam Saffron)]

Following code causes a segfault in ruby head on x64:

class A
attr_accessor :b

def hash
[b,""].hash
end
end

class B
attr_accessor :a

def hash
[a,""].hash
end
end

a = A.new
b = B.new
a.b = b
b.a = a

p a.hash
p b.hash

p [a,"hello"].hash == [b,"world"].hash

[nobu (Nobuyoshi Nakada)]

It's a simple machine stack overflow.
What's your platform?

[Hanmac (Hans Mackowiak)]

its a similar error to #9003

p a.hash # raises Stack Error
p b.hash # Segmentation fault: 11

happens for:
ruby 2.1.0dev (2013-11-26 trunk 43854) [x86_64-darwin12.0]

does not happen for:
ruby 2.1.0dev (2013-09-22 trunk 43011) [i686-linux]

[sam.saffron (Sam Saffron)]

@nobu (Nobuyoshi Nakada) running in ubuntu latest x64

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed
• % Done changed from 0 to 100

This issue was solved with changeset r43859.
Sam, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

---

hash.c: cut off if recursion

• hash.c (rb_hash): cut off if recursion detected to get rid of stack
  overflow. [ruby-core:58567] [Bug #9151]