Ship hard drives across the ocean instead. At 11 Mbps with full utilization, you’re looking at just shy of 90 days to transfer 10 TB. 11 Mbps = 1.375 MBps = 116.015 GB/day. 10240 GB / 116.015 GB/day = ~88.3 days.
This happens when a python extension (written in C) tries to access a memory beyond reach. You can trace it in following ways. Add sys.settrace at the very first line of the code. Use gdb as described by Mark in this answer.. At the command promptgdb python (gdb) run /path/to/script.py ## wait for segfault ## (gdb) backtrace ## stack trace of the c code