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2015-09-23 04:34:56 +0200 | asked a question | Unhandled SIGSEGV in Sage 6.8 I am trying to use python multiprocessing to start worker threads that execute a complex algorithm and produce rows of a matrix. Along the way, worker threads attempt to row reduce the rows they have produced using the echelonize() method. This works in some cases. However, when working with a 9 x 860 matrix over QQ, the worker thread crashes with If I comment out the echelonize() call, the crash does not happen. I pickled the matrix and loaded into an interactive sage session and echelonize() succeeded. Any suggestions for how to debug this situation are appreciated. Vince |