Comment 2 for bug 1495173

StacktraceTop:
 g_bit_lock (address=address@entry=0x20, lock_bit=lock_bit@entry=0) at /build/glib2.0-hcw3A1/glib2.0-2.45.7/./glib/gbitlock.c:214
 g_variant_lock (value=0x0) at /build/glib2.0-hcw3A1/glib2.0-2.45.7/./glib/gvariant-core.c:221
 g_variant_fill_gvs (serialised=0x7ffe529046f0, data=0x0) at /build/glib2.0-hcw3A1/glib2.0-2.45.7/./glib/gvariant-core.c:399
 gvs_variable_sized_array_needed_size (n_children=2, children=0x1b916e0, gvs_filler=0x7f33bc8e9700 <g_variant_fill_gvs>, type_info=<optimized out>) at /build/glib2.0-hcw3A1/glib2.0-2.45.7/./glib/gvariant-serialiser.c:709
 g_variant_serialiser_needed_size (type_info=<optimized out>, gvs_filler=gvs_filler@entry=0x7f33bc8e9700 <g_variant_fill_gvs>, children=0x1b916e0, n_children=2) at /build/glib2.0-hcw3A1/glib2.0-2.45.7/./glib/gvariant-serialiser.c:1434