When using a QtWebEngine-based browser (such as a 2.x release of QupZilla, or the simplebrowser coming with QtWebEngine's source) and resizing the window a couple of times, I get various crashes.
IIRC, QtWebEngine uses multithreaded OpenGL, which might be related? What I've seen so far:

==========

    #0  0x00007fffd2bd0141 in brw_bo_unreference (bo=0x555500000005) at brw_bufmgr.c:650
    #1  0x00007fffd2c04f4d in intel_destroy_image (image=0x555559857230) at intel_screen.c:582
    #2  0x00007fffd868fedb in dri3_free_render_buffer (draw=draw@entry=0x5555567ccc68, buffer=buffer@entry=0x5555566233f0) at loader_dri3_helper.c:224
    #3  0x00007fffd8691d72 in dri3_get_buffer (driDrawable=driDrawable@entry=0x5555566718e0, format=format@entry=4098, buffer_type=buffer_type@entry=loader_dri3_buffer_back, draw=draw@entry=0x5555567ccc68) at loader_dri3_helper.c:1438
    #4  0x00007fffd8691f61 in loader_dri3_get_buffers (driDrawable=driDrawable@entry=0x5555566718e0, format=4098, stamp=stamp@entry=0x555556671910, loaderPrivate=loaderPrivate@entry=0x5555567ccc68, buffer_mask=buffer_mask@entry=1, buffers=buffers@entry=0x7fffffffc040) at loader_dri3_helper.c:1591
    #5  0x00007fffd2bd4491 in intel_update_image_buffers (brw=brw@entry=0x555557d70460, drawable=drawable@entry=0x5555566718e0) at brw_context.c:1678
    #6  0x00007fffd2bd6991 in intel_update_renderbuffers (context=context@entry=0x555556750ff0, drawable=drawable@entry=0x5555566718e0) at brw_context.c:1358
    #7  0x00007fffd2bd6a62 in intel_prepare_render (brw=brw@entry=0x555557d70460) at brw_context.c:1379
    #8  0x00007fffd2bd2094 in brw_clear (ctx=0x555557d70460, mask=2) at brw_clear.c:278
    #9  0x00007fffd2817136 in clear (no_error=false, mask=16384, ctx=0x555557d70460) at main/clear.c:221
    #10 0x00007fffd2817136 in _mesa_Clear (mask=<optimized out>) at main/clear.c:242
    #11 0x00007fffe96f7dac in QPlatformBackingStore::composeAndFlush(QWindow*, QRegion const&, QPoint const&, QPlatformTextureList*, QOpenGLContext*, bool) () at /home/florian/proj/qutebrowser/git/.tox/py36-pyqt59/lib/python3.6/site-packages/PyQt5/Qt/lib/libQt5Gui.so.5
    #12 0x00007fffd9a515e7 in  () at /home/florian/proj/qutebrowser/git/.tox/py36-pyqt59/lib/python3.6/site-packages/PyQt5/Qt/plugins/platforms/../../lib/libQt5XcbQpa.so.5
    #13 0x00007fffe73efb87 in  () at /home/florian/proj/qutebrowser/git/.tox/py36-pyqt59/lib/python3.6/site-packages/PyQt5/Qt/lib/libQt5Widgets.so.5
    #14 0x00007fffe73f102e in  () at /home/florian/proj/qutebrowser/git/.tox/py36-pyqt59/lib/python3.6/site-packages/PyQt5/Qt/lib/libQt5Widgets.so.5
    #15 0x00007fffe73f2cef in  () at /home/florian/proj/qutebrowser/git/.tox/py36-pyqt59/lib/python3.6/site-packages/PyQt5/Qt/lib/libQt5Widgets.so.5
    #16 0x00007fffe73f2f1a in  () at /home/florian/proj/qutebrowser/git/.tox/py36-pyqt59/lib/python3.6/site-packages/PyQt5/Qt/lib/libQt5Widgets.so.5
    #17 0x00007fffe740945f in QWidgetPrivate::syncBackingStore() () at /home/florian/proj/qutebrowser/git/.tox/py36-pyqt59/lib/python3.6/site-packages/PyQt5/Qt/lib/libQt5Widgets.so.5
    
==========

    #0  0x00007fffd2bd1482 in brw_bo_get_tiling (bo=bo@entry=0x51, tiling_mode=tiling_mode@entry=0x7fffffffbf38, swizzle_mode=swizzle_mode@entry=0x7fffffffbf3c) at brw_bufmgr.c:1104
    #1  0x00007fffd2c01c9e in intel_miptree_create_for_bo (brw=brw@entry=0x555557d6fbc0, bo=0x51, format=format@entry=MESA_FORMAT_B8G8R8X8_UNORM, offset=3746450432, width=4294967295, height=4294967295, depth=1, pitch=1501472960, flags=MIPTREE_CREATE_DEFAULT) at intel_mipmap_tree.c:850
    #2  0x00007fffd2c01f9f in intel_miptree_create_for_dri_image (brw=brw@entry=0x555557d6fbc0, image=image@entry=0x555557ae89a0, target=target@entry=3553, format=MESA_FORMAT_B8G8R8X8_UNORM, is_winsys_image=is_winsys_image@entry=true) at intel_mipmap_tree.c:1039
    #3  0x00007fffd2bd42e6 in intel_update_image_buffer (intel=intel@entry=0x555557d6fbc0, drawable=drawable@entry=0x555556671180, rb=rb@entry=0x5555567e2680, buffer=0x555557ae89a0, buffer_type=buffer_type@entry=__DRI_IMAGE_BUFFER_BACK) at brw_context.c:1629
    #4  0x00007fffd2bd4521 in intel_update_image_buffers (brw=brw@entry=0x555557d6fbc0, drawable=drawable@entry=0x555556671180) at brw_context.c:1700
    #5  0x00007fffd2bd6991 in intel_update_renderbuffers (context=context@entry=0x555556750510, drawable=drawable@entry=0x555556671180) at brw_context.c:1358
    #6  0x00007fffd2bd6a62 in intel_prepare_render (brw=brw@entry=0x555557d6fbc0) at brw_context.c:1379
    #7  0x00007fffd2bd2094 in brw_clear (ctx=0x555557d6fbc0, mask=2) at brw_clear.c:278
    #8  0x00007fffd2817136 in clear (no_error=false, mask=16384, ctx=0x555557d6fbc0) at main/clear.c:221
    #9  0x00007fffd2817136 in _mesa_Clear (mask=<optimized out>) at main/clear.c:242
    (rest like above)

==========
    
    #0  0x00007fffcf858f23 in intel_miptree_create_for_dri_image (brw=brw@entry=0x55555731d880, image=image@entry=0x555558de4340, target=target@entry=3553, format=MESA_FORMAT_B8G8R8X8_UNORM, is_winsys_image=is_winsys_image@entry=true) at intel_mipmap_tree.c:991
    #1  0x00007fffcf82b2e6 in intel_update_image_buffer (intel=intel@entry=0x55555731d880, drawable=drawable@entry=0x5555572f0c30, rb=rb@entry=0x5555584243a0, buffer=0x555558de4340, buffer_type=buffer_type@entry=__DRI_IMAGE_BUFFER_BACK) at brw_context.c:1629
    #2  0x00007fffcf82b521 in intel_update_image_buffers (brw=brw@entry=0x55555731d880, drawable=drawable@entry=0x5555572f0c30) at brw_context.c:1700
    #3  0x00007fffcf82d991 in intel_update_renderbuffers (context=context@entry=0x5555572fa460, drawable=drawable@entry=0x5555572f0c30) at brw_context.c:1358
    #4  0x00007fffcf82da62 in intel_prepare_render (brw=brw@entry=0x55555731d880) at brw_context.c:1379
    #5  0x00007fffcf829094 in brw_clear (ctx=0x55555731d880, mask=2) at brw_clear.c:278
    #6  0x00007fffcf46e136 in clear (no_error=false, mask=16384, ctx=0x55555731d880) at main/clear.c:221
    #7  _mesa_Clear (mask=<optimized out>) at main/clear.c:242
    #8  0x00007fffe5b8e8c1 in QOpenGLFunctions::glClear (mask=16384, this=0x555558422440) at ../../include/QtGui/../../src/gui/opengl/qopenglfunctions.h:643
    #9  QPlatformBackingStore::composeAndFlush (this=this@entry=0x555555aa8660, window=window@entry=0x555555abb120, region=..., offset=..., textures=textures@entry=0x555558db7ea0, translucentBackground=translucentBackground@entry=false) at painting/qplatformbackingstore.cpp:349
    #10 0x00007fffd85de383 in QXcbBackingStore::composeAndFlush (this=this@entry=0x555555aa8660, window=0x555555abb120, region=..., offset=..., textures=textures@entry=0x555558db7ea0, translucentBackground=translucentBackground@entry=false) at qxcbbackingstore.cpp:711
    #11 0x00007fffe5eeb7a2 in QWidgetBackingStore::qt_flush (widget=widget@entry=0x5555559e6000, region=..., backingStore=backingStore@entry=0x7fffd0007c60, tlw=tlw@entry=0x5555559e6000, widgetTextures=widgetTextures@entry=0x555558db7ea0, widgetBackingStore=widgetBackingStore@entry=0x555555acbc50)
        at kernel/qwidgetbackingstore.cpp:146
    #12 0x00007fffe5eef479 in QWidgetBackingStore::sync (this=0x555555acbc50, exposedWidget=0x5555559e6000, exposedRegion=...) at kernel/qwidgetbackingstore.cpp:1120
    #13 0x00007fffe5f0ec1c in QWidgetPrivate::syncBackingStore (this=this@entry=0x5555555e7610, region=...) at kernel/qwidget.cpp:1968
    #14 0x00007fffe5f48a49 in QWidgetWindow::handleExposeEvent (this=this@entry=0x555555abb120, event=event@entry=0x7fffffffda10) at kernel/qwidgetwindow.cpp:954

==========

I'm running Archlinux on a Thinkpad X1 Yoga with an i7-6600U. `glxinfo -B` output:

    name of display: :0
    display: :0  screen: 0
    direct rendering: Yes
    Extended renderer info (GLX_MESA_query_renderer):
        Vendor: Intel Open Source Technology Center (0x8086)
        Device: Mesa DRI Intel(R) HD Graphics 520 (Skylake GT2)  (0x1916)
        Version: 17.3.0
        Accelerated: yes
        Video memory: 3072MB
        Unified memory: yes
        Preferred profile: core (0x1)
        Max core profile version: 4.5
        Max compat profile version: 3.0
        Max GLES1 profile version: 1.1
        Max GLES[23] profile version: 3.2
    OpenGL vendor string: Intel Open Source Technology Center
    OpenGL renderer string: Mesa DRI Intel(R) HD Graphics 520 (Skylake GT2) 
    OpenGL core profile version string: 4.5 (Core Profile) Mesa 17.3.0
    OpenGL core profile shading language version string: 4.50
    OpenGL core profile context flags: (none)
    OpenGL core profile profile mask: core profile
    
    OpenGL version string: 3.0 Mesa 17.3.0
    OpenGL shading language version string: 1.30
    OpenGL context flags: (none)
    
    OpenGL ES profile version string: OpenGL ES 3.2 Mesa 17.3.0
    OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20


lspci: 00:02.0 VGA compatible controller: Intel Corporation HD Graphics 520 (rev 07) (prog-if 00 [VGA controller])
uname -a: Linux hooch 4.14.6-1-ARCH #1 SMP PREEMPT Thu Dec 14 21:26:16 UTC 2017 x86_64 GNU/Linux

Let me know if you need more information!