Comment 5 for bug 628968

Thanks Radek. The backtrace looks pretty complete. Summary copied as follows:

#0 0x00007ffff1132c06 in GC_malloc (bytes=256) at thread_local_alloc.c:176
#1 0x000000000071bc9f in Inkscape::GC::Core::malloc (doc=0x1116320, default_ns=0x0) at ./gc-core.h:74
#2 operator new (doc=0x1116320, default_ns=0x0) at ./gc-core.h:148
#3 Inkscape::GC::Managed<(Inkscape::GC::ScanPolicy)0, (Inkscape::GC::CollectionPolicy)0>::operator new (doc=0x1116320, default_ns=0x0) at ./gc-managed.h:35
#4 sp_repr_do_read (doc=0x1116320, default_ns=0x0) at xml/repr-io.cpp:414
#5 0x000000000071bf24 in sp_repr_read_mem (buffer=<value optimized out>, length=16723, default_ns=0x0) at xml/repr-io.cpp:328
#6 0x000000000047f065 in Inkscape::Preferences::_loadDefaults (this=0x110d880) at preferences.cpp:119
#7 0x000000000048036c in Preferences (this=0x110d880) at preferences.cpp:97
#8 0x00000000006e0bc0 in Inkscape::Preferences::get () at ./preferences.h:434
#9 injectCustomSize () at widgets/icon.cpp:672
#10 0x00000000006e1105 in sp_icon_get_phys_size (size=-134557312) at widgets/icon.cpp:720
#11 0x00000000004537fd in sp_main_gui (argc=1, argv=0x7fffffffe888) at main.cpp:930
#12 0x0000000000452db9 in main (argc=1, argv=<value optimized out>) at main.cpp:685