heibel@homer ~/external/eigen/eigen_bin/gcc $ gdb ./test/householder_1 GNU gdb 6.8.0.20080328-cvs (cygwin-special) Copyright (C) 2008 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "i686-pc-cygwin"... (gdb) run Starting program: /cygdrive/c/Users/heibel/Documents/work/external/eigen/eigen_bin/gcc/test/householder_1 [New thread 3772.0x1b50] Error: dll starting at 0x77a60000 not found. Error: dll starting at 0x77960000 not found. Error: dll starting at 0x77a60000 not found. Error: dll starting at 0x77b80000 not found. [New thread 3772.0x1514] Initializing random number generator with seed 1287662742 Repeating each test 10 times Program received signal SIGSEGV, Segmentation fault. Eigen::MatrixBase >::applyHouseholderOnTheLeft > (this=0x28cb20, essential=@0x28cbd0, tau=@0x28cbe0, workspace=0x28cb30) at /home/heibel/external/eigen/eigen/Eigen/src/Core/Product.h:199 199 Base::coeffRef(0,0) = (lhs.transpose().cwiseProduct(rhs)).sum(); (gdb) bt #0 Eigen::MatrixBase >::applyHouseholderOnTheLeft > (this=0x28cb20, essential=@0x28cbd0, tau=@0x28cbe0, workspace=0x28cb30) at /home/heibel/external/eigen/eigen/Eigen/src/Core/Product.h:199 #1 0x00402178 in householder > (m=@0x28cc30) at /home/heibel/external/eigen/eigen/test/householder.cpp:61 #2 0x00401570 in test_householder () at /home/heibel/external/eigen/eigen/test/householder.cpp:124 #3 0x0040183f in _fu21___ZSt4cout () at /home/heibel/external/eigen/eigen/test/main.h:531 (gdb)