The mark callback for the ruby bindings calls rb_gc_mark on uninitialized data.

[abic]

At the following line the rb_sigar_mark call back doesn't check whether logger is pointing to a valid Ruby object or not.

sigar/bindings/ruby/rbsigar.c

Line 158 in 91aead2

rb_gc_mark(rbsigar->logger);

The following ruby code will segfault without the sigar.logger set:

require 'sigar'
require 'logger'

GC.disable

sigars = []

10.times do
  sigar = Sigar.new
  #sigar.logger = Logger.new(STDOUT)
  sigars << sigar
end

GC.enable
GC.start

sleep 2

[kostya]

got the same bug very often (with logger is ok)