https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81155
--- Comment #2 from Andrey Guskov <andrey.y.guskov at intel dot com> --- Well, it is actually a bisection. Do I need to rule out a GDB problem? GDB on our testing machine is as follows: $ gdb -v | grep GDB GNU gdb (GDB) Fedora 7.10.1-31.fc23 This GDB was configured as "x86_64-redhat-linux-gnu".