What does "Dwarf Error: Cannot find type of die" mean?

[Duncan Sands <baldrick@xxxxxxx>]

I sometimes see this kind of mysterious message in gdb when debugging code
compiled with gcc from CVS head.  Does anyone know what it could mean?

Die: DW_TAG_subrange_type (abbrev = 5, offset = 11562)
        has children: FALSE
        attributes:
                DW_AT_name (DW_FORM_string) string: "system__tasking__task_entry_index___XDLU_0__2147483647"
                DW_AT_lower_bound (DW_FORM_data1) constant: 0
                DW_AT_upper_bound (DW_FORM_data4) constant: 2147483647
                DW_AT_type (DW_FORM_ref4) constant: 1046
Dwarf Error: Cannot find type of die [in module /home/duncan/tmp/dbg2]

Thanks,

Duncan.