Dear Maintainer, I tried to find out when this started to happen.
And I found this issue in releases 11-bullseye, 10-buster and 9-stretch. In 8-jessie such a vgcore shows in gdb the correct line information. Further looking brought me to stretch/testing as of 29.10.2016, where the issue starts to be visible. At that date the gcc-6 version changed from 6.2.0-6 to 6.2.0-9. The changelog [1] entries between these versions mention a "--enable-default-pie". So I tested to build the executable with the option "-no-pie" in buster/stable which made the vgcore work. Therefore this PIE option might be related. Kind regards, Bernhard [1] https://metadata.ftp-master.debian.org/changelogs//main/g/gcc-6/gcc-6_6.3.0-18+deb9u1_changelog
