How to reproduce:

 - build Fragmentarium (https://github.com/Syntopia/Fragmentarium)
 - run the binary
 - crash occurs when the rendering starts

Tested on Fedora 20 (mesa 9.2.3) and Ubuntu 13.10 (mesa 9.2.1).


Program received signal SIGSEGV, Segmentation fault.
0x00007fffdc660e25 in fs_visitor::visit (this=0x7ffffffdadf0, ir=0x16f0890) at brw_fs_visitor.cpp:1903
1903	      ir->counter->accept(this);
Missing separate debuginfos, use: debuginfo-install OpenEXR-libs-1.7.1-6.fc20.x86_64 appmenu-qt-0.2.6-4.fc20.x86_64 attica-0.4.2-2.fc20.x86_64 bzip2-libs-1.0.6-9.fc20.x86_64 dbus-libs-1.6.12-1.fc20.x86_64 dbusmenu-qt-0.9.2-5.fc20.x86_64 fontconfig-2.11.0-1.fc20.x86_64 freetype-2.5.0-4.fc20.x86_64 gamin-0.1.10-15.fc20.x86_64 glib2-2.38.2-1.fc20.x86_64 herqq-1.0.0-6.fc20.x86_64 ilmbase-1.0.3-7.fc20.x86_64 jasper-libs-1.900.1-25.fc20.x86_64 jbigkit-libs-2.0-9.fc20.x86_64 kde-runtime-libs-4.11.3-2.fc20.x86_64 kde-style-oxygen-4.11.3-1.fc20.x86_64 kdelibs-4.11.3-1.fc20.x86_64 keyutils-libs-1.5.8-1.fc20.x86_64 krb5-libs-1.11.3-33.fc20.x86_64 lcms-libs-1.19-10.fc20.x86_64 libICE-1.0.8-6.fc20.x86_64 libSM-1.2.1-6.fc20.x86_64 libX11-1.6.1-1.fc20.x86_64 libXau-1.0.8-2.fc20.x86_64 libXcursor-1.1.14-2.fc20.x86_64 libXdamage-1.1.4-4.fc20.x86_64 libXdmcp-1.1.1-5.fc20.x86_64 libXext-1.3.2-2.fc20.x86_64 libXfixes-5.0.1-2.fc20.x86_64 libXft-2.3.1-5.fc20.x86_64 libXi-1.7.2-2.fc20.x86_64 libXinerama-1.1.3-2.fc20.x86_64 libXpm-3.5.10-5.fc20.x86_64 libXrandr-1.4.1-2.fc20.x86_64 libXrender-0.9.8-2.fc20.x86_64 libXtst-1.2.2-2.fc20.x86_64 libXxf86vm-1.1.3-2.fc20.x86_64 libacl-2.2.52-4.fc20.x86_64 libattr-2.4.47-3.fc20.x86_64 libcom_err-1.42.8-3.fc20.x86_64 libicu-50.1.2-10.fc20.x86_64 libjpeg-turbo-1.3.0-1.fc20.x86_64 libmng-1.0.10-12.fc20.x86_64 libpciaccess-0.13.1-4.fc20.x86_64 libpng-1.6.3-3.fc20.x86_64 libtiff-4.0.3-12.fc20.x86_64 libuuid-2.24-2.fc20.x86_64 libwebp-0.3.1-2.fc20.x86_64 libxcb-1.9.1-3.fc20.x86_64 libxml2-2.9.1-2.fc20.x86_64 openssl-libs-1.0.1e-30.fc20.x86_64 pcre-8.33-2.fc20.1.x86_64 qca2-2.0.3-6.fc20.x86_64 qt-4.8.5-10.fc20.x86_64 qt-x11-4.8.5-10.fc20.x86_64 qtsoap-2.7-6.fc20.x86_64 soprano-2.9.4-2.fc20.x86_64 strigi-libs-0.7.8-2.fc20.x86_64 systemd-libs-208-6.fc20.x86_64 xz-libs-5.1.2-6alpha.fc20.x86_64
(gdb) bt
#0  0x00007fffdc660e25 in fs_visitor::visit (this=0x7ffffffdadf0, ir=0x16f0890) at brw_fs_visitor.cpp:1903
#1  0x00007fffdc671555 in fs_visitor::visit (this=0x7ffffffdadf0, ir=0x1644e10) at brw_fs_visitor.cpp:1875
#2  0x00007fffdc671555 in fs_visitor::visit (this=0x7ffffffdadf0, ir=0x133ca00) at brw_fs_visitor.cpp:1875
#3  0x00007fffdc6613dd in fs_visitor::visit (this=0x7ffffffdadf0, ir=<optimized out>) at brw_fs_visitor.cpp:1988
#4  0x00007fffdc64f301 in fs_visitor::run (this=this@entry=0x7ffffffdadf0) at brw_fs.cpp:2936
#5  0x00007fffdc64f7fe in brw_wm_fs_emit (brw=brw@entry=0x7ed3f0, c=c@entry=0x1553fa0, fp=fp@entry=0x1722730, prog=prog@entry=0x119b9c0, 
    final_assembly_size=final_assembly_size@entry=0x7fffffffbcb4) at brw_fs.cpp:3065
#6  0x00007fffdc6a811b in do_wm_prog (brw=0x7ed3f0, prog=0x119b9c0, fp=0x1722730, key=0x7fffffffbd00) at brw_wm.c:174
#7  0x00007fffdc64f6da in brw_fs_precompile (ctx=ctx@entry=0x7ed3f0, prog=prog@entry=0x119b9c0) at brw_fs.cpp:3180
#8  0x00007fffdc67ceb3 in brw_shader_precompile (prog=0x119b9c0, ctx=0x7ed3f0) at brw_shader.cpp:69
#9  brw_link_shader (ctx=0x7ed3f0, shProg=0x119b9c0) at brw_shader.cpp:281
#10 0x00007fffdc254e42 in _mesa_glsl_link_shader (ctx=ctx@entry=0x7ed3f0, prog=prog@entry=0x119b9c0) at ../../../src/mesa/program/ir_to_mesa.cpp:3120
#11 0x00007fffdc1103d3 in link_program (ctx=0x7ed3f0) at ../../../src/mesa/main/shaderapi.c:819
#12 0x00007ffff78e4389 in QGLShaderProgram::link() () from /lib64/libQtOpenGL.so.4
#13 0x00000000004243fa in Fragmentarium::GUI::DisplayWidget::setupFragmentShader() ()
#14 0x000000000042736e in Fragmentarium::GUI::DisplayWidget::setFragmentShader(Fragmentarium::Parser::FragmentSource) ()
#15 0x0000000000435d37 in Fragmentarium::GUI::MainWindow::render() ()
#16 0x00000000004701a2 in Fragmentarium::GUI::MainWindow::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) [clone .part.0] ()
#17 0x00007ffff6843fa8 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /lib64/libQtCore.so.4
#18 0x00007ffff6d5a7a2 in QAction::triggered(bool) () from /lib64/libQtGui.so.4
#19 0x00007ffff6d5c357 in QAction::activate(QAction::ActionEvent) () from /lib64/libQtGui.so.4
#20 0x00007ffff71282f6 in QAbstractButtonPrivate::click() () from /lib64/libQtGui.so.4
#21 0x00007ffff712843c in QAbstractButton::mouseReleaseEvent(QMouseEvent*) () from /lib64/libQtGui.so.4
#22 0x00007ffff71e9c8a in QToolButton::mouseReleaseEvent(QMouseEvent*) () from /lib64/libQtGui.so.4
#23 0x00007ffff6db3d1a in QWidget::event(QEvent*) () from /lib64/libQtGui.so.4
#24 0x00007ffff6d60dac in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQtGui.so.4
#25 0x00007ffff6d67899 in QApplication::notify(QObject*, QEvent*) () from /lib64/libQtGui.so.4
#26 0x00007ffff682f5ed in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /lib64/libQtCore.so.4
#27 0x00007ffff6d66fc7 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) ()
   from /lib64/libQtGui.so.4
#28 0x00007ffff6ddc77b in QETWidget::translateMouseEvent(_XEvent const*) () from /lib64/libQtGui.so.4
#29 0x00007ffff6ddb1ec in QApplication::x11ProcessEvent(_XEvent*) () from /lib64/libQtGui.so.4
#30 0x00007ffff6e02be4 in x11EventSourceDispatch(_GSource*, int (*)(void*), void*) () from /lib64/libQtGui.so.4
#31 0x00007ffff28b82a6 in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#32 0x00007ffff28b8628 in g_main_context_iterate.isra.24 () from /lib64/libglib-2.0.so.0
#33 0x00007ffff28b86dc in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#34 0x00007ffff685e185 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtCore.so.4
#35 0x00007ffff6e02d66 in QGuiEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtGui.so.4
#36 0x00007ffff682e12f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtCore.so.4
#37 0x00007ffff682e47d in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtCore.so.4
#38 0x00007ffff68339bb in QCoreApplication::exec() () from /lib64/libQtCore.so.4
#39 0x0000000000415dae in main ()