Comment 2 for bug 1276753

StacktraceTop:
 _int_malloc (av=av@entry=0x7f1a97513760 <main_arena>, bytes=bytes@entry=72) at malloc.c:3263
 __libc_calloc (n=<optimized out>, elem_size=<optimized out>) at malloc.c:3191
 g_malloc0 (n_bytes=72) at /build/buildd/glib2.0-2.39.4/./glib/gmem.c:127
 g_closure_new_simple (sizeof_closure=<optimized out>, data=0x152e8b10) at /build/buildd/glib2.0-2.39.4/./gobject/gclosure.c:199
 g_cclosure_new (callback_func=0x7f1a99208cf0 <gtk_style_context_cascade_changed>, user_data=0x152e8b10, destroy_data=0x0) at /build/buildd/glib2.0-2.39.4/./gobject/gclosure.c:910