Created attachment 22027 [details]
reduced testcase.

(gdb) r
Starting program: /home/users/pawels/sandbox/src/gdb-printers-bugs/02/t

Breakpoint 1, main () at t.cpp:13
13              Bus bus;
(gdb) n
14              bus.c.insert( new Connection() );
(gdb)
15              bus.c.insert( new Connection() );
(gdb) p bus
$1 = (Bus) {
  _vptr.Bus = 0x418050,
  c = std::set with 1 elements = {
    [0] = 0x633c20
  }
}
(gdb) n
16              bus.c.insert( new Connection() );
(gdb) p bus
$2 = (Bus) {
  _vptr.Bus = 0x418050,
  c = std::set with 2 elementsTraceback (most recent call last):
  File "/local/devel/toolchain45/x86_64-gnu-linux.mt_alloc/share/gcc-4.5.2/python/libstdcxx/v6/printers.py", line 395, in next
    item = self.rbiter.next()
  File "/local/devel/toolchain45/x86_64-gnu-linux.mt_alloc/share/gcc-4.5.2/python/libstdcxx/v6/printers.py", line 297, in next
    if node.dereference()['_M_right']:
RuntimeError: Attempt to dereference a generic pointer.

}