Comment 2 for bug 1067907

StacktraceTop:
 __libc_message (do_abort=2, fmt=0x7fb03587d028 "*** glibc detected *** %s: %s: 0x%s ***\n") at ../sysdeps/unix/sysv/linux/libc_fatal.c:201
 malloc_printerr (action=3, str=0x7fb035879933 "free(): invalid pointer", ptr=<optimized out>) at malloc.c:5007
 deallocate (__p=0x27d04b0, this=<optimized out>) at /usr/include/c++/4.7/ext/new_allocator.h:100
 deallocate (__p=0x27d04b0, __a=..., __n=<optimized out>) at /usr/include/c++/4.7/bits/alloc_traits.h:375
 delete_node (n=0x27d04b0, this=<optimized out>) at /usr/include/boost/unordered/detail/buckets.hpp:398