<p>I think I've narrowed it down slightly:</p>

<p>Breakpoint 3, mlpack::regression::LogisticRegressionmlpack::optimization::L_BFGS::LogisticRegression (this=0x7fffffffd8a0, predictors=..., responses=..., lambda=0)<br>
    at /home/john/pangwas/code/mlpack/build_logit_debug/include/mlpack/methods/logistic_regression/logistic_regression_impl.hpp:32<br>
32    LogisticRegressionFunction errorFunction(predictors, responses, lambda);<br>
(gdb) p predictors.n_rows<br>
$15 = 3069</p>

<p>(gdb) s<br>
mlpack::regression::LogisticRegressionFunction::LogisticRegressionFunction (this=0x7fffffffcf00, predictors=..., responses=..., lambda=0)<br>
    at /home/john/pangwas/code/mlpack/src/mlpack/methods/logistic_regression/logistic_regression_function.cpp:25<br>
25      lambda(lambda)<br>
(gdb) p predictors.n_rows<br>
$18 = 4294970365</p>

<p>i.e. in the passing of predictors at line 32 of logistic_regression_impl.hpp to LogisiticRegressionFunction (defined at line 19 of logistic_regression_function.cpp) something I don't understand is happening</p>

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