the "Follow Symbol Under Cursor" happens way before the segfault

backtrace
#0  0x00007fffcab5d7e8 in std::_Rb_tree<CPlusPlus::Name const*, 
std::pair<CPlusPlus::Name const* const, CPlusPlus::Declaration*>, 
std::_Select1st<std::pair<CPlusPlus::Name const* const, 
CPlusPlus::Declaration*> >, CPlusPlus::Name::Compare, 
std::allocator<std::pair<CPlusPlus::Name const* const, CPlusPlus::Declaration*> 
> >::_M_lower_bound(std::_Rb_tree_node<std::pair<CPlusPlus::Name const* const, 
CPlusPlus::Declaration*> >*, std::_Rb_tree_node<std::pair<CPlusPlus::Name 
const* const, CPlusPlus::Declaration*> >*, CPlusPlus::Name const* const&) () 
from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#1  0x00007fffcab592a8 in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#2  0x00007fffcab55bb7 in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#3  0x00007fffcab579f9 in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#4  0x00007fffcab57b18 in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#5  0x00007fffcab57913 in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#6  0x00007fffcab57b71 in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#7  0x00007fffcab57b18 in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#8  0x00007fffcab57b71 in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#9  0x00007fffcab57b71 in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#10 0x00007fffcab57b71 in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#11 0x00007fffcab5741d in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#12 0x00007fffcab5741d in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#13 0x00007fffcab57c53 in CPlusPlus::LookupScope::lookupType(CPlusPlus::Name 
const*) ()
   from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#14 0x00007fffcab5895f in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#15 0x00007fffcab58e95 in CPlusPlus::LookupScope::lookup(CPlusPlus::Name 
const*) ()
   from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#16 0x00007fffcab488db in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#17 0x00007fffcab49bee in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#18 0x00007fffcab52e98 in 
CPlusPlus::CreateBindings::resolveTemplateArgument(CPlusPlus::Clone&, 
CPlusPlus::Subst&, CPlusPlus::LookupScope*, CPlusPlus::Template const*, 
CPlusPlus::TemplateNameId const*, unsigned int) ()
   from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#19 0x00007fffcab531a5 in 
CPlusPlus::CreateBindings::initializeSubst(CPlusPlus::Clone&, 
CPlusPlus::Subst&, CPlusPlus::LookupScope*, CPlusPlus::Template const*, 
CPlusPlus::TemplateNameId const*) ()
   from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#20 0x00007fffcab5654a in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#21 0x00007fffcab56c70 in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#22 0x00007fffcab579f9 in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#23 0x00007fffcab57913 in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#24 0x00007fffcab57b71 in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#25 0x00007fffcab57b18 in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#26 0x00007fffcab57b71 in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#27 0x00007fffcab57b71 in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#28 0x00007fffcab57b71 in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#29 0x00007fffcab57c53 in CPlusPlus::LookupScope::lookupType(CPlusPlus::Name 
const*) ()
   from /usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#30 0x00007fffcab593ac in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#31 0x00007fffcab55bb7 in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#32 0x00007fffcab579f9 in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#33 0x00007fffcab57454 in ?? () from 
/usr/lib/x86_64-linux-gnu/qtcreator/plugins/../libCPlusPlus.so.1
#34 0x00007fffcab57c53 in CPlusPlus::LookupScope::lookupType(CPlusPlus::Name 
const*) ()

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https://bugs.launchpad.net/bugs/1561498

Title:
  QtCreator crashes on 16.04

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