Pedro,
this is Alex's patch of 
https://sourceware.org/ml/gdb-patches/2017-09/msg00745.html cleaned up 
with changelog formatting.  Alex is a fellow FaceBooker.

The patch looks obvious to me, particularly as a few lines down we have:

       fprintf_unfiltered (gdb_stdlog,
			  "    %s CUs, %s TUs\n",
			  pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
			  pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));

to protect dump output from exactly this problem.

ok?

nathan
-- 
Nathan Sidwell