lldb-mi-git r74.89945aa I worked around https://bugs.kde.org/show_bug.cgi?id=413372 by editing /usr/share/kdevlldb/formatters/qt.py with - from urlparse import urlsplit, urlunsplit + from urllib.parse import urlsplit, urlunsplit Just mentioning it because I don't know if python3 is the problem. Setting lldb as debugger for a crashing program seems to halt the program fine at the crash but the Frame Stack tab is empty. When going to the LLDB Console tab and running backtrace, the Frame Stack tab gets populated with frame info, but the entire tab is disabled and unclickable.