A couple of observations:
1. It seems that the crash occurs only when switching between Video- or Music- 
lens to any other lens.
2. There are a lot of qt-at-spi warnings related to unsupported events, e.g.
.....
unity-2d-shell: [WARNING] QSpiAccessible::accessibleEvent not handled:  "800b"  
obj:  QDeclarativeColumn(0x8c50ba8) "" 
unity-2d-shell: [WARNING] QSpiAccessible::accessibleEvent not handled:  "800b"  
obj:  TextCustom_QMLTYPE_29(0x902b8b8) "" 
unity-2d-shell: [WARNING] QSpiAccessible::accessibleEvent not handled:  "800b"  
obj:  TextCustom_QMLTYPE_29(0x90bc010) "" 
unity-2d-shell: [WARNING] QSpiAccessible::accessibleEvent not handled:  "800b"  
obj:  QDeclarativeItem_QML_60(0x90a9578) "" 
unity-2d-shell: [WARNING] QSpiAccessible::accessibleEvent not handled:  "800b"  
obj:  QDeclarativeColumn(0x90cf0a8) "" 
unity-2d-shell: [WARNING] QSpiAccessible::accessibleEvent not handled:  "800b"  
obj:  TextCustom_QMLTYPE_29(0x8ff8718) "" 
unity-2d-shell: [WARNING] QSpiAccessible::accessibleEvent not handled:  "800b"  
obj:  TextCustom_QMLTYPE_29(0x90d9478) "
......

if you look at stacktrace frame for
QDeclarativeAccessibilityUpdater::sendGeometryUpdate method call, its
'item' argument corresponds to one of the QDeclarativeColumn objects
displayed in qt-at-spi warnings, e.g.

#6  0xb6e6b163 in QDeclarativeAccessibilityUpdater::sendGeometryUpdate
(this=0x81b4c2c, item=0x90cf0a8)

and it's always QDeclarativeColumn for every crash I experienced.

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https://bugs.launchpad.net/bugs/918566

Title:
  unity-2d-places crashed with SIGSEGV in
  QCoreApplication::notifyInternal()

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