Comment 6 for bug 1204996

Here is another one:

#0 0x00007ffff54b4037 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1 0x00007ffff54b7698 in __GI_abort () at abort.c:90
#2 0x00007ffff54f15ab in __libc_message (do_abort=do_abort@entry=2, fmt=fmt@entry=0x7ffff5604860 "*** Error in `%s': %s: 0x%s ***\n")
    at ../sysdeps/unix/sysv/linux/libc_fatal.c:199
#3 0x00007ffff54fda46 in malloc_printerr (ptr=0xa39730, str=0x7ffff5604a00 "free(): invalid next size (fast)", action=3) at malloc.c:4902
#4 _int_free (av=<optimized out>, p=0xa39720, have_lock=0) at malloc.c:3758
#5 0x00007ffff6c46bdf in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6 0x00007ffff6c4bccc in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7 0x00007ffff6c57de5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8 0x00007ffff6c58dfc in QQuickVisualDataModel::item(int, bool) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#9 0x00007ffff6c9d687 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#10 0x00007ffff6c4038e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007ffff6c9bed5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#12 0x00007ffff6ca13f8 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#13 0x00007ffff61393bc in QQmlVME::complete(QQmlVME::Interrupt const&) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#14 0x00007ffff6133eb6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#15 0x00007ffff61345e6 in QQmlEnginePrivate::incubate(QQmlIncubator&, QQmlContextData*) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#16 0x00007ffff6c58029 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#17 0x00007ffff6c58dfc in QQuickVisualDataModel::item(int, bool) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#18 0x00007ffff6c9d687 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#19 0x00007ffff6c4038e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#20 0x00007ffff6c9c01c in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#21 0x00007ffff6ca13f8 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#22 0x00007ffff61393bc in QQmlVME::complete(QQmlVME::Interrupt const&) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#23 0x00007ffff612ed26 in QQmlComponentPrivate::complete(QQmlEnginePrivate*, QQmlComponentPrivate::ConstructionState*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#24 0x00007ffff612ee17 in QQmlComponentPrivate::completeCreate() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#25 0x00007ffff612ec95 in QQmlComponent::create(QQmlContext*) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#26 0x0000000000408570 in WebBrowserApp::initialize() ()
#27 0x00000000004096b3 in main ()