Comment 2 for bug 1676269

StacktraceTop:
 __malloc_assert (assertion=assertion@entry=0x7f86e8b41348 "((size + offset) & (GLRO (dl_pagesize) - 1)) == 0", file=file@entry=0x7f86e8b3de6e "malloc.c", line=line@entry=2880, function=function@entry=0x7f86e8b41e68 <__func__.11331> "mremap_chunk") at malloc.c:301
 mremap_chunk (p=p@entry=0x7f86e9e10230 <initial>, new_size=new_size@entry=64) at malloc.c:2880
 __GI___libc_realloc (oldmem=0x7f86e9e10240 <empty>, bytes=52) at malloc.c:3060
 g_realloc () from /tmp/apport_sandbox_GLUOvA/lib/x86_64-linux-gnu/libglib-2.0.so.0
 gtk_css_node_declaration_make_writable_resize (decl=<optimized out>, offset=48, bytes_added=4, bytes_removed=0) at ././gtk/gtkcssnodedeclaration.c:98