I also have frequent crashes due to a segmentation fault. My backtrace is a bit different: (gdb) bt #0 0x00007ffff619843c in _int_malloc (av=av@entry=0x7fff4c000020, bytes=bytes@entry=56) at malloc.c:3354 #1 0x00007ffff619a5a4 in __GI___libc_malloc (bytes=56) at malloc.c:2914 #2 0x00007ffff6783e78 in operator new(unsigned long) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6 #3 0x00007fffc792079e in CPlusPlus::CloneName::cloneName(CPlusPlus::Name const*, CPlusPlus::Subst*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #4 0x00007fffc7920a0d in CPlusPlus::CloneType::visit(CPlusPlus::NamedType*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #5 0x00007fffc791e09f in CPlusPlus::Type::accept(CPlusPlus::TypeVisitor*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #6 0x00007fffc791f6ca in CPlusPlus::CloneType::cloneType(CPlusPlus::FullySpecifiedType const&, CPlusPlus::Subst*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #7 0x00007fffc791f8d1 in CPlusPlus::Clone::type(CPlusPlus::FullySpecifiedType const&, CPlusPlus::Subst*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #8 0x00007fffc7920a49 in CPlusPlus::CloneType::visit(CPlusPlus::NamedType*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #9 0x00007fffc791e09f in CPlusPlus::Type::accept(CPlusPlus::TypeVisitor*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #10 0x00007fffc791f6ca in CPlusPlus::CloneType::cloneType(CPlusPlus::FullySpecifiedType const&, CPlusPlus::Subst*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #11 0x00007fffc791f8d1 in CPlusPlus::Clone::type(CPlusPlus::FullySpecifiedType const&, CPlusPlus::Subst*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #12 0x00007fffc791fbfb in CPlusPlus::CloneName::visit(CPlusPlus::TemplateNameId const*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #13 0x00007fffc78ec32c in CPlusPlus::Name::accept(CPlusPlus::NameVisitor*) const () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #14 0x00007fffc7920729 in CPlusPlus::CloneName::cloneName(CPlusPlus::Name const*, CPlusPlus::Subst*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #15 0x00007fffc7920b3b in CPlusPlus::CloneName::visit(CPlusPlus::QualifiedNameId const*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #16 0x00007fffc78ec32c in CPlusPlus::Name::accept(CPlusPlus::NameVisitor*) const () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #17 0x00007fffc7920729 in CPlusPlus::CloneName::cloneName(CPlusPlus::Name const*, CPlusPlus::Subst*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #18 0x00007fffc7920b59 in CPlusPlus::CloneName::visit(CPlusPlus::QualifiedNameId const*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #19 0x00007fffc78ec32c in CPlusPlus::Name::accept(CPlusPlus::NameVisitor*) const () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #20 0x00007fffc7920729 in CPlusPlus::CloneName::cloneName(CPlusPlus::Name const*, CPlusPlus::Subst*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #21 0x00007fffc7920a0d in CPlusPlus::CloneType::visit(CPlusPlus::NamedType*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #22 0x00007fffc791e09f in CPlusPlus::Type::accept(CPlusPlus::TypeVisitor*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #23 0x00007fffc791f6ca in CPlusPlus::CloneType::cloneType(CPlusPlus::FullySpecifiedType const&, CPlusPlus::Subst*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #24 0x00007fffc791f8d1 in CPlusPlus::Clone::type(CPlusPlus::FullySpecifiedType const&, CPlusPlus::Subst*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #25 0x00007fffc791fbfb in CPlusPlus::CloneName::visit(CPlusPlus::TemplateNameId const*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #26 0x00007fffc78ec32c in CPlusPlus::Name::accept(CPlusPlus::NameVisitor*) const () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #27 0x00007fffc7920729 in CPlusPlus::CloneName::cloneName(CPlusPlus::Name const*, CPlusPlus::Subst*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #28 0x00007fffc7920a0d in CPlusPlus::CloneType::visit(CPlusPlus::NamedType*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #29 0x00007fffc791e09f in CPlusPlus::Type::accept(CPlusPlus::TypeVisitor*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #30 0x00007fffc791f6ca in CPlusPlus::CloneType::cloneType(CPlusPlus::FullySpecifiedType const&, CPlusPlus::Subst*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #31 0x00007fffc791f8d1 in CPlusPlus::Clone::type(CPlusPlus::FullySpecifiedType const&, CPlusPlus::Subst*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #32 0x00007fffc791fbfb in CPlusPlus::CloneName::visit(CPlusPlus::TemplateNameId const*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #33 0x00007fffc78ec32c in CPlusPlus::Name::accept(CPlusPlus::NameVisitor*) const () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #34 0x00007fffc7920729 in CPlusPlus::CloneName::cloneName(CPlusPlus::Name const*, CPlusPlus::Subst*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #35 0x00007fffc7920b59 in CPlusPlus::CloneName::visit(CPlusPlus::QualifiedNameId const*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #36 0x00007fffc78ec32c in CPlusPlus::Name::accept(CPlusPlus::NameVisitor*) const () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #37 0x00007fffc7920729 in CPlusPlus::CloneName::cloneName(CPlusPlus::Name const*, CPlusPlus::Subst*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #38 0x00007fffc7920a0d in CPlusPlus::CloneType::visit(CPlusPlus::NamedType*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #39 0x00007fffc791e09f in CPlusPlus::Type::accept(CPlusPlus::TypeVisitor*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 ---Type to continue, or q to quit--- #40 0x00007fffc791f6ca in CPlusPlus::CloneType::cloneType(CPlusPlus::FullySpecifiedType const&, CPlusPlus::Subst*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #41 0x00007fffc791f8d1 in CPlusPlus::Clone::type(CPlusPlus::FullySpecifiedType const&, CPlusPlus::Subst*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #42 0x00007fffc79186a2 in CPlusPlus::Declaration::Declaration(CPlusPlus::Clone*, CPlusPlus::Subst*, CPlusPlus::Declaration*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #43 0x00007fffc791e80a in CPlusPlus::CloneSymbol::visit(CPlusPlus::Declaration*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #44 0x00007fffc7915c8c in CPlusPlus::Symbol::visitSymbol(CPlusPlus::SymbolVisitor*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #45 0x00007fffc791fecf in CPlusPlus::CloneSymbol::cloneSymbol(CPlusPlus::Symbol*, CPlusPlus::Subst*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #46 0x00007fffc794c1d5 in ?? () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #47 0x00007fffc794cb06 in ?? () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #48 0x00007fffc794c3ce in ?? () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #49 0x00007fffc794cb06 in ?? () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #50 0x00007fffc794c3ce in ?? () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #51 0x00007fffc794d5bc in ?? () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #52 0x00007fffc794e9f9 in ?? () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #53 0x00007fffc794e913 in ?? () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #54 0x00007fffc794eb71 in ?? () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #55 0x00007fffc794eb18 in ?? () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #56 0x00007fffc794eb71 in ?? () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #57 0x00007fffc794eb71 in ?? () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #58 0x00007fffc794eb71 in ?? () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #59 0x00007fffc794ec53 in CPlusPlus::LookupScope::lookupType(CPlusPlus::Name const*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #60 0x00007fffc79503ac in ?? () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #61 0x00007fffc794cbb7 in ?? () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #62 0x00007fffc794e9f9 in ?? () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #63 0x00007fffc794e454 in ?? () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 #64 0x00007fffc794ec53 in CPlusPlus::LookupScope::lookupType(CPlusPlus::Name const*) () from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1 It goes on like that, seems like infinite recursion?