Using recent git 0070511, and similar kdevplatform/kdevelop.

On opening a group of files (over sftp, in case that matters), KDevelop crashed with this trace:

(gdb) bt full
#0  0x00007f1c861cd538 in KDevelop::AbstractType::d_func() const (this=0x0) at /home/flh/projects/kdevplatform/language/duchain/types/abstracttype.h:286
#1  0x00007f1c861cceb0 in KDevelop::AbstractType::modifiers() const (this=0x0) at /home/flh/projects/kdevplatform/language/duchain/types/abstracttype.cpp:52
#2  0x00007f1c56e59c59 in HighlightingInstance::typeForDeclaration(KDevelop::Declaration*, KDevelop::DUContext*) const (this=0x7f1c3c6c0110, decl=0x7f1c3c660a60, context=0x7f1c3c0f5d30)
    at /home/flh/projects/kdev-php/phphighlighting.cpp:45
#3  0x00007f1c86251520 in KDevelop::CodeHighlightingInstance::highlightUse(KDevelop::DUContext*, int, QColor const&) (this=0x7f1c3c6c0110, context=0x7f1c3c0f5d30, index=2, color=...)
    at /home/flh/projects/kdevplatform/language/highlighting/codehighlighting.cpp:474
        type = KDevelop::HighlightingEnumContainer::ErrorVariableType
        decl = 0x7f1c3c660a60
#4  0x00007f1c862508ed in KDevelop::CodeHighlightingInstance::highlightDUChain(KDevelop::DUContext*, QHash<KDevelop::Declaration*, unsigned int>, QVector<KDevelop::Declaration*>) (this=0x7f1c3c6c0110, context=0x7f1c3c0f5d30, colorsForDeclarations=..., declarationsForColors=...) at /home/flh/projects/kdevplatform/language/highlighting/codehighlighting.cpp:301
        decl = 0x7f1c3c660a60
        color =
              {cspec = QColor::Rgb, ct = {argb = {alpha = 65535, red = 12938, green = 32146, blue = 12578, pad = 0}, ahsv = {alpha = 65535, hue = 12938, saturation = 32146, value = 12578, pad = 0}, acmyk = {alpha = 65535, cyan = 12938, magenta = 32146, yellow = 12578, black = 0}, ahsl = {alpha = 65535, hue = 12938, saturation = 32146, lightness = 12578, pad = 0}, array = {65535, 12938, 32146, 12578, 0}}}
        a = 2
        lock = {m_lock = 0x7f1c869921e0 <KDevelop::(anonymous namespace)::Q_QGS_sdDUChainPrivate::innerFunction()::holder+32>, m_locked = true, m_timeout = 0}
        top = 0x7f1c3c02de60
        takeFreeColors =
            {<QListSpecialMethods<KDevelop::Declaration*>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {_q_value = {<std::__atomic_base<int>> = {static _S_alignment = 4, _M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x7f1c88f48c60 <QListData::shared_null>}, d = 0x7f1c88f48c60 <QListData::shared_null>}}
        children = {d = 0x7f1c88f46e80 <QArrayData::shared_null>}
#5  0x00007f1c86250aa9 in KDevelop::CodeHighlightingInstance::highlightDUChain(KDevelop::DUContext*, QHash<KDevelop::Declaration*, unsigned int>, QVector<KDevelop::Declaration*>) (this=0x7f1c3c6c0110, context=0x7f1c3c02de60, colorsForDeclarations=..., declarationsForColors=...) at /home/flh/projects/kdevplatform/language/highlighting/codehighlighting.cpp:314
        child = 0x7f1c3c0f5d30
        _container_ = {c = {d = 0x7f1c3c0f9bd0}, i = {i = 0x7f1c3c0f9fd0}, e = {i = 0x7f1c3c0fa0e8}, control = 1}
        lock = {m_lock = 0x7f1c869921e0 <KDevelop::(anonymous namespace)::Q_QGS_sdDUChainPrivate::innerFunction()::holder+32>, m_locked = false, m_timeout = 0}
        top = 0x7f1c3c02de60
        takeFreeColors =
            {<QListSpecialMethods<KDevelop::Declaration*>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {_q_value = {<std::__atomic_base<int>> = {static _S_alignment = 4, _M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x7f1c88f48c60 <QListData::shared_null>}, d = 0x7f1c88f48c60 <QListData::shared_null>}}
        children = {d = 0x7f1c3c0f9bd0}
#6  0x00007f1c8624fe34 in KDevelop::CodeHighlightingInstance::highlightDUChain(KDevelop::TopDUContext*) (this=0x7f1c3c6c0110, context=0x7f1c3c02de60)
    at /home/flh/projects/kdevplatform/language/highlighting/codehighlighting.cpp:212
#7  0x00007f1c8624fb05 in KDevelop::CodeHighlighting::highlightDUChain(KDevelop::ReferencedTopDUContext) (this=0x274f170, context=...)
    at /home/flh/projects/kdevplatform/language/highlighting/codehighlighting.cpp:193
        url = {m_index = 337154}
        urlLock = {m_url = {m_index = 337154}}
        lock = {m_lock = 0x7f1c869921e0 <KDevelop::(anonymous namespace)::Q_QGS_sdDUChainPrivate::innerFunction()::holder+32>, m_locked = false, m_timeout = 0}
        revision = 0
        __PRETTY_FUNCTION__ = "virtual void KDevelop::CodeHighlighting::highlightDUChain(KDevelop::ReferencedTopDUContext)"
        instance = 0x7f1c3c6c0110
        highlighting = 0x677dcf8
#8  0x00007f1c860a08c7 in KDevelop::ParseJob::highlightDUChain() (this=0x59293a0) at /home/flh/projects/kdevplatform/language/backgroundparser/parsejob.cpp:501
#9  0x00007f1c860a060e in KDevelop::ParseJob::isUpdateRequired(KDevelop::IndexedString const&) (this=0x59293a0, languageString=...)
    at /home/flh/projects/kdevplatform/language/backgroundparser/parsejob.cpp:477
        file = @0x7f1c3c6de240: {d = 0x7f1c3c002780}
        _container_ =
          {c = {<QListSpecialMethods<QExplicitlySharedDataPointer<KDevelop::ParsingEnvironmentFile> >> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {_q_value = {<std::__atomic_base<int>> = {static _S_alignment = 4, _M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x7f1c3c6de230}, d = 0x7f1c3c6de230}}, i = {i = 0x7f1c3c6de240}, e = {i = 0x7f1c3c6de248}, control = 1}
        lock = {m_lock = 0x7f1c869921e0 <KDevelop::(anonymous namespace)::Q_QGS_sdDUChainPrivate::innerFunction()::holder+32>, m_locked = false, m_timeout = 0}
        __PRETTY_FUNCTION__ = "bool KDevelop::ParseJob::isUpdateRequired(const KDevelop::IndexedString&)"
#10 0x00007f1c56e565a8 in Php::ParseJob::run(QSharedPointer<ThreadWeaver::JobInterface>, ThreadWeaver::Thread*) (this=0x59293a0) at /home/flh/projects/kdev-php/phpparsejob.cpp:87
        urlLock = {m_url = {m_index = 337154}}
        p = {d = 0x0}