.
Thread 1 (process 10018):
#0  0x00002ae6673325d4 in pkgDepCache::CheckDep (this=0x8b3590, Dep={Dep = 0x2ae668b1d370, Type = pkgCache::DepIterator::DepVer, Owner = 0x8b3bd0}, Type=0, Res=@0x7fff44814890)
    at ../build/include/apt-pkg/cacheiterators.h:228
No locals.
#1  0x00002ae667332f5e in pkgDepCache::DependencyState (this=0x2ae668301360, D=@0x7fff44814940) at ../build/include/apt-pkg/depcache.h:306
	State = <value optimized out>
#2  0x00002ae667336ba4 in pkgDepCache::Update (this=0x8b3590, Prog=0x7fff44814b20) at depcache.cc:623
	State = (unsigned char &) @0x8d2db1: 0 '\0'
	Done = <value optimized out>
#3  0x00002ae6673370ea in pkgDepCache::Init (this=0x8b3590, Prog=0x7fff44814b20) at depcache.cc:154
	actions = {cache = @0x8b3590, released = false}
#4  0x00002ae6673548e2 in pkgCacheFile::Open (this=0x8b1ff0, Progress=@0x7fff44814b20, WithLock=<value optimized out>) at cachefile.cc:101
No locals.
#5  0x00002ae6670c3bcb in TmpGetCache (Self=<value optimized out>, Args=<value optimized out>) at python/cache.cc:972
	Prog = {<OpProgress> = {_vptr.OpProgress = 0x2ae6675baf90, Current = 29634, Total = 59268, Size = 29634, SubTotal = 29634, LastPercent = 52.0247002, LastTime = {
      tv_sec = 1190841676, tv_usec = 480168}, LastOp = {static npos = 18446744073709551615, 
      _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x7d4828 "Building dependency tree"}}, 
    LastSubOp = {static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
        _M_p = 0x8b37a8 "Dependency generation"}}, Op = {static npos = 18446744073709551615, 
      _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x8b3a88 "Building dependency tree"}}, SubOp = {
      static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
        _M_p = 0x8b37a8 "Dependency generation"}}, Percent = 52.2271729, MajorChange = false}, OldOp = {static npos = 18446744073709551615, 
    _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x8b3a88 "Building dependency tree"}}, 
  NoUpdate = false, NoDisplay = false, LastLen = 32}
	pyCallbackInst = (PyObject *) 0x0
	Cache = (pkgCacheFile *) 0x8b1ff0
	CacheFileObj = <value optimized out>
	CacheObj = <value optimized out>
#6  0x0000000000488af7 in PyEval_EvalFrameEx (f=0x7bdb10, throwflag=<value optimized out>) at ../Python/ceval.c:3564
	arg = <value optimized out>
	stack_pointer = <value optimized out>
	next_instr = (unsigned char *) 0x7d1fb9 "Z\030"
	opcode = 131
	oparg = <value optimized out>
	why = <value optimized out>
	err = 0
	x = <value optimized out>
	v = <value optimized out>
	w = <value optimized out>
	u = <value optimized out>
	t = <value optimized out>
	stream = <value optimized out>
	fastlocals = (PyObject **) 0x7bdc88
	freevars = (PyObject **) 0x7bdc88
	retval = (PyObject *) 0x0
	tstate = (PyThreadState *) 0x75a2e0
	co = (PyCodeObject *) 0x2ae66631d828
	instr_ub = -1
	instr_lb = 0
	instr_prev = -1
	first_instr = <value optimized out>
	names = (PyObject *) 0x7cfcc0
	consts = (PyObject *) 0x7cfa00
#7  0x0000000000489d60 in PyEval_EvalCodeEx (co=0x2ae66631d828, globals=<value optimized out>, locals=<value optimized out>, args=0x0, argcount=0, kws=0x0, kwcount=0, defs=0x0, 
    defcount=0, closure=0x0) at ../Python/ceval.c:2831
	f = (PyFrameObject *) 0x7bdb10
	retval = (PyObject *) 0x0
	fastlocals = (PyObject **) 0x7bdc88
	freevars = (PyObject **) 0x7bdc88
	tstate = (PyThreadState *) 0x75a2e0
	x = <value optimized out>
	u = (PyObject *) 0x0
#8  0x0000000000489da2 in PyEval_EvalCode (co=0x2ae668301360, globals=0x46027e99, locals=0x2ae6682f5000) at ../Python/ceval.c:494
No locals.
#9  0x00000000004ab4ee in PyRun_FileExFlags (fp=0x75a010, filename=0x7fff44816bd0 "/usr/lib/update-notifier/apt-check", start=<value optimized out>, globals=0x77d6a0, 
    locals=0x77d6a0, closeit=1, flags=0x7fff448150a0) at ../Python/pythonrun.c:1273
	ret = (PyObject *) 0x0
	mod = <value optimized out>
	arena = (PyArena *) 0x76b6c0
#10 0x00000000004ab780 in PyRun_SimpleFileExFlags (fp=0x75a010, filename=0x7fff44816bd0 "/usr/lib/update-notifier/apt-check", closeit=1, flags=0x7fff448150a0)
    at ../Python/pythonrun.c:879
	buf = "#!"
	m = <value optimized out>
	d = (PyObject *) 0x77d6a0
	v = <value optimized out>
	ext = 0x7fff44816bee "heck"
#11 0x0000000000414725 in Py_Main (argc=<value optimized out>, argv=0x7fff448151c8) at ../Modules/main.c:523
	v = <value optimized out>
	c = <value optimized out>
	sts = 0
	command = 0x0
	filename = 0x46027e99 <Address 0x46027e99 out of bounds>
	module = 0x0
	fp = (FILE *) 0x75a010
	p = <value optimized out>
	inspect = 0
	unbuffered = <value optimized out>
	skipfirstline = 0
	stdin_is_interactive = 0
	help = <value optimized out>
	version = <value optimized out>
	saw_inspect_flag = 0
	saw_unbuffered_flag = 0
	cf = {cf_flags = 0}
#12 0x00002ae666d71b44 in __libc_start_main () from /lib/libc.so.6
#13 0x0000000000413c69 in _start ()