Comment 2 for bug 1379769

StacktraceTop:
 __libc_message (do_abort=do_abort@entry=1, fmt=fmt@entry=0x7f785e05fa40 "*** Error in `%s': %s: 0x%s ***\n") at ../sysdeps/posix/libc_fatal.c:175
 malloc_printerr (ptr=<optimized out>, str=0x7f785e05fb28 "double free or corruption (!prev)", action=1) at malloc.c:4996
 _int_free (av=<optimized out>, p=<optimized out>, have_lock=0) at malloc.c:3840
 std::string::reserve(unsigned long) () from /tmp/apport_sandbox_676TYy/usr/lib/x86_64-linux-gnu/libstdc++.so.6
 push_back (__c=<optimized out>, this=<optimized out>) at /usr/include/c++/4.8/bits/basic_string.h:1056