IMHO the problem here can be using a very outdated libLLVM version (which is even not in unstable). The things I don't understand are:
1) Why Qt Creator is still using this old version? According to the stack trace, libLLVM 7 is triggered, but then it starts calling functions from an older library 2) Why this version is still in use and cannot be automatically removed? > For some reason unknown to me there are several packages still depending on this special version of libLLVM. When I try to remove it, qtcreator is listed among them. As is xorg - which prevents me from performing the `apt-get remove`. What is the output of `apt rdepends libllvm3.7`? -- Alexander Kernozhitsky