Comment 2 for bug 2006048

StacktraceTop:
 __libc_message (action=action@entry=do_abort, fmt=fmt@entry=0x7f845d7b95dc "%s\n") at ../sysdeps/posix/libc_fatal.c:155
 malloc_printerr (str=str@entry=0x7f845d7bc2d8 "double free or corruption (out)") at ./malloc/malloc.c:5660
 _int_free (av=0x7f845d7f6c60 <main_arena>, p=0x7f845bb5f540, have_lock=<optimized out>, have_lock@entry=0) at ./malloc/malloc.c:4584
 __GI___libc_free (mem=<optimized out>) at ./malloc/malloc.c:3385
 XFree (data=<optimized out>) at ../../src/XlibInt.c:1633