Running command cscope -b -q
When ncscope.out file size reaches 644177920 Byte, the command exits with segmentation fault.
This is running on Ubuntu machine v8.1 and cscope version 16.0a
640 MB of cscope.out --- what are you indexing: the entire source code of Linux, KDE and X11 combined?
And which command exactly is that? Are you sure it's not just exhausting your main memory?