Overview

This project rolls up a repeatable test case that non-deterministically causes the JVM to produce a segmentation fault of the following form:

#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x00007fcd15089da8, pid=26646, tid=140518304237312
#
# JRE version: 7.0_21-b02
# Java VM: OpenJDK 64-Bit Server VM (23.7-b01 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# J  org.apache.http.impl.cookie.BestMatchSpec.formatCookies(Ljava/util/List;)Ljava/util/List;
#
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# If you would like to submit a bug report, please include
# instructions on how to reproduce the bug and visit:
#   https://bugs.launchpad.net/ubuntu/+source/openjdk-7/
#

This appears to exhibit the same behavior as the bug reported here. Adding the -XX:-LoopUnswitching JVM argument fixes this issue, as referenced in a similar bug reported in here.

Upstream problem has been reported: java 7 branch and java 8 branch

How to run

git clone https://github.com/rholder/jvm-loop-unswitching-bug.git
cd jvm-loop-unswitching-bug
./gradlew clean test --info

You may need to repeat the test command a few times until the segmentation fault appears.

Failing JVM's Tested

• java full version "1.7.0_51-b13"
  • Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
  • Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)
• java full version "1.7.0_21-b02"
  • OpenJDK Runtime Environment (IcedTea 2.3.9) (7u21-2.3.9-1ubuntu1)
  • OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode)
• java full version "1.7.0_17-b02"
  • Java(TM) SE Runtime Environment (build 1.7.0_17-b02)
  • Java HotSpot(TM) 64-Bit Server VM (build 23.7-b01, mixed mode)
• java full version "1.7.0_15-b20"
  • OpenJDK Runtime Environment (IcedTea7 2.3.7) (7u15-2.3.7-0ubuntu1~12.04.1)
  • OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode)
• java full version "1.6.0_24-b24"
  • OpenJDK Runtime Environment (IcedTea6 1.11.5) (amazon-53.1.11.5.47.amzn1-x86_64)
  • OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)

Succeeding JVM's Tested

• java version "1.7.0_60-ea" (Early Access)
  • Java(TM) SE Runtime Environment (build 1.7.0_60-ea-b04)
  • Java HotSpot(TM) 64-Bit Server VM (build 24.60-b07, mixed mode)
• java version "1.8.0" (Early Access)
  • Java(TM) SE Runtime Environment (build 1.8.0-b129)
  • Java HotSpot(TM) 64-Bit Server VM (build 25.0-b69, mixed mode)

Additional Notes

Current testing indicates that both single and multi-core machines cause this bug to manifest itself.

Contributors

• Ray Holder (rholder)
• Chad Bayer (chadbay)
• Thibaud Lepretre (kakawait)