See http://www.delorie.com/djgpp/mail-archives/browse.cgi?p=djgpp/2015/05/24/04:17:40 >>>> (gdb) r >>>> Starting program: h:/l/bins/bin/a.exe >>>> Warning: >>>> Cannot insert breakpoint 1. >>>> Cannot access memory at address 0x1e04
Fixed by commits 99cee7b71f81a9d346fc1a2f4e678537f1bb945f (master) and f045cbadc7e222520eb457966ae739ff53ddfd76 (gdb-7.9-branch).