[root@foo jruby-1.7.25]# PATH=bin/:$PATH ./bin/irb
irb(main):001:0> JRUBY_VERSION
=> "1.7.25"
irb(main):002:0> require 'java'
=> false
irb(main):003:0> java_import java.lang.System
=> [Java::JavaLang::System]
irb(main):004:0> System.getProperties["java.runtime.version"]
=> "1.7.0_111-mockbuild_2016_07_27_10_50-b00"
irb(main):005:0> a = [2688,2765,2746,2764,1008,1077,2745,1338,1665,1135,1157,1158,1160,1395,1470,1018,1399,1307]
=> [2688, 2765, 2746, 2764, 1008, 1077, 2745, 1338, 1665, 1135, 1157, 1158, 1160, 1395, 1470, 1018, 1399, 1307]
irb(main):006:0> (0..2).each{|th| Thread.new { (0..100000).each{|rr| a.each{ |x| puts Etc.getgrgid(x.to_i).name}} }}
=> 0..2
... # Output removed to hide group names...
irb(main):007:0>
...
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x00007f840213b3e5, pid=29540, tid=140204612916992
#
# JRE version: OpenJDK Runtime Environment (7.0_99) (build 1.7.0_99-mockbuild_2016_03_25_01_00-b00)
# Java VM: OpenJDK 64-Bit Server VM (24.95-b01 mixed mode linux-amd64 compressed oops)
# Derivative: IcedTea 2.6.5
# Distribution: CentOS Linux release 7.2.1511 (Core) , package rhel-2.6.5.0.el7_2-x86_64 u99-b00
# Problematic frame:
# C  [libc.so.6+0x1633e5]  __strlen_sse2_pminub+0x35
#
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /tmp/jvm-29540/hs_error.log
#
# If you would like to submit a bug report, please include
# instructions on how to reproduce the bug and visit:
#   http://icedtea.classpath.org/bugzilla
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
Aborted