[eigen] GTest occasionally segfaults with Quaterniond typedef?

Hi Eigen,

I've recently had some troubles that Gael G. and Christoph H. have patiently helped me with, (thank you both very much for your time), but I still have an issue that I wonder if anyone else might be seeing as well. Files are attached, the scenario is below, along with code you can copy/paste into files to attempt to reproduce my gremlin in case the attached files are stripped away.

I use GoogleTest for unit testing, and it works great, but a few weeks ago I started having trouble with segfault issues caused by misalignment in other parts of my project and I now see it in GTest unit tests as well... but the worst part is that the GTest segfault only happens about 50% of the time, to which I have no explanation.

If I employ the following test in addition to the other unit tests in the framework of my project, this test will segfault part of the time, not every time, just sometimes, which is what I am hoping to understand. However, if I simply test only the code below, using the CMakeLists.txt following and nothing else, I can't get it to fail even once.

If I uncomment the "EIGEN_MAKE_ALIGNED_OPERATOR_NEW" line, when this test is one of many other unit tests, it never segfaults within my unit test framework. It is clearly an alignment issue, however, I would love to know why it fails sometimes and not every time.

So my question is... Does anyone else see anomalous segfaults using Eigen and GoogleTest like this? If you add this unit test to your unit test suites, does it occasionally segfault but not always?

(Files are attached, but I don't know if they'll get stripped in the mailing list.)

Thanks for any advice Eigen!

-Mark Sauder

CODE:

Here is the unit test I can get to segfault about 50% of the time, it is simple enough and accomplished nothing outside of creating a Vector4d and a Quaterniond and initializing them. Following that is my
CMakeLists.txt file content, (just "mkdir build", "cd build", "cmake ..", "cd ..", "make" and the resulting unit test will always pass... but as one of your other unit tests as with my project, I would like to hear back if it segfaults occasionally. Thanks again.

______________________________________________________

#include "gtest/gtest.h"

#include <Eigen/Dense>
#include <Eigen/Geometry>
#include <iostream>

class QuaternionTest
    : public ::testing::Test
{
public:
    //EIGEN_MAKE_ALIGNED_OPERATOR_NEW
protected:

    virtual void SetUp()
    {
        vector1 = Eigen::Vector4d(1., 1., 1., 1.);
        quaternion1 = Eigen::Quaterniond::Identity();
    }

    Eigen::Vector4d vector1;
    Eigen::Quaterniond quaternion1;
};

TEST_F(QuaternionTest, assignment)
{
}

________________________________________________________

CMAKE_MINIMUM_REQUIRED(VERSION 3.0.2)

PROJECT(unitTesting)

INCLUDE(ExternalProject)

SET(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)

FIND_PACKAGE(Eigen3)
FIND_PACKAGE(Threads)

ADD_DEFINITIONS(
-O3
-DAPL=0
-DIBM=0
-DLIN=1
-DNDEBUG
-DXPLM200
-DXPLM210
-Wall
-Wextra
-fvisibility=hidden
-fPIC
-g
-march=native
-pedantic
-pthread
)

SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu11 -fms-extensions")
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11 -fms-extensions")

SET(GTEST_PREFIX "${CMAKE_CURRENT_BINARY_DIR}/gtest")
EXTERNALPROJECT_ADD(GTestExternal
PREFIX             "${GTEST_PREFIX}"
URL https://googletest.googlecode.com/files/gtest-1.7.0.zip
URL_HASH SHA1=f85f6d2481e2c6c4a18539e391aa4ea8ab0394af
INSTALL_COMMAND ""
)

SET(LIBPREFIX "${CMAKE_STATIC_LIBRARY_PREFIX}")
SET(LIBSUFFIX "${CMAKE_STATIC_LIBRARY_SUFFIX}")
SET(GTEST_LOCATION "${GTEST_PREFIX}/src/GTestExternal-build")
SET(GTEST_LIBRARY "${GTEST_LOCATION}/${LIBPREFIX}gtest${LIBSUFFIX}")
SET(GTEST_MAINLIB "${GTEST_LOCATION}/${LIBPREFIX}gtest_main${LIBSUFFIX}")

ADD_LIBRARY(GTest IMPORTED STATIC GLOBAL)
SET_TARGET_PROPERTIES(GTest PROPERTIES
    IMPORTED_LOCATION
    "${GTEST_LIBRARY}"
    IMPORTED_LINK_INTERFACE_LIBRARIES
    "${CMAKE_THREAD_LIBS_INIT}"
    )

ADD_LIBRARY(GTestMain IMPORTED STATIC GLOBAL)
SET_TARGET_PROPERTIES(GTestMain PROPERTIES
    IMPORTED_LOCATION
    "${GTEST_MAINLIB}"
    IMPORTED_LINK_INTERFACE_LIBRARIES
    "${GTEST_LIBRARY};${CMAKE_THREAD_LIBS_INIT}"
    )

ADD_DEPENDENCIES(GTest GTestExternal)
ADD_DEPENDENCIES(GTestMain GTestExternal)

EXTERNALPROJECT_GET_PROPERTY(GTestExternal source_dir)

INCLUDE_DIRECTORIES(
eigen
${EIGEN3_INCLUDE_DIR}
${source_dir}/include
)

SET(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

SET(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${LD_VERSION_SCRIPT_FLAG}")

ADD_EXECUTABLE(unitTests
QuaternionTest.cpp
)

TARGET_LINK_LIBRARIES(unitTests
GTestMain
)

_________________________________________________________________________