buffer overflow with gtags

I'm having a problem running gtags on a directory. It keeps saying:
     "input buffer overflow, can't enlarge buffer because scanner uses REJECT"
     "gtags: command failed in xargs_read()."

I have tried running it as:
     gtags.exe (in windows)
     gtags  (in linux)
     gtags -v (says it was able to extract tags from 533 files before dying)
     gtags -n 255
     gtags -f file_full_of_php_paths_only.txt

and all of the above commands crashed the same way.