#0  ~basic_string (this=0x7fff36c4b210, __in_chrg=<optimized out>) at /usr/include/c++/4.7/bits/basic_string.h:536
No locals.
#1  pkgProblemResolver::DoUpgrade (this=0x7fff36c4b240, Pkg=<incomplete type>) at algorithms.cc:730
        P = <incomplete type>
        Start = {<pkgCache::Iterator<pkgCache::Dependency, pkgCache::DepIterator>> = {<std::iterator<std::forward_iterator_tag, pkgCache::Dependency, long, pkgCache::Dependency*, pkgCache::Dependency&>> = {<No data fields>}, _vptr.Iterator = 0x319, S = 0x4, Owner = 0x7fff36c4b2af}, Type = (unknown: 918860936)}
        End = {<pkgCache::Iterator<pkgCache::Dependency, pkgCache::DepIterator>> = {<std::iterator<std::forward_iterator_tag, pkgCache::Dependency, long, pkgCache::Dependency*, pkgCache::Dependency&>> = {<No data fields>}, _vptr.Iterator = 0x6102c6f020, S = 0x1074188, Owner = 0x6b1d58}, Type = (unknown: 14316704)}
        D = {<pkgCache::Iterator<pkgCache::Dependency, pkgCache::DepIterator>> = {<std::iterator<std::forward_iterator_tag, pkgCache::Dependency, long, pkgCache::Dependency*, pkgCache::Dependency&>> = {<No data fields>}, _vptr.Iterator = 0x1b1b090, S = 0x1c95d50, Owner = 0xeda880}, Type = (unknown: 4466924)}
        group = {cache = @0x27a6e70, released = 128}
        WasKept = false
        Fail = <optimized out>
#2  0x00007f031e1b0580 in __GI___libc_malloc (bytes=18321984) at malloc.c:2859
        ar_ptr = 0x0
        victim = 0x27a6e70
        __func__ = "__libc_malloc"
#3  0x00000000018f7480 in ?? ()
No symbol table info available.
#4  0x0000000000db9b40 in ?? ()
No symbol table info available.
#5  0x0000000000000000 in ?? ()
No symbol table info available.