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[Bug gdb/15325] New: crashes with "segmentation fault" for self-created dwarf-file


http://sourceware.org/bugzilla/show_bug.cgi?id=15325

             Bug #: 15325
           Summary: crashes with "segmentation fault" for self-created
                    dwarf-file
           Product: gdb
           Version: 7.5
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
        AssignedTo: unassigned@sourceware.org
        ReportedBy: smarf@gmx.de
    Classification: Unclassified


Created attachment 6961
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6961
floppy disk image and dwarf debug info

I tried to build a dwarf-file for a bootable image (see attached file
floppy.img which can be started via "qemu -fda floppy.img -boot a -s"). This
dwarf-file (see attached file dwarf) seems to be ok for readelf and dwarfdump,
but not for gdb. 

Starting gdb with "gdb --se=dwarf" and connecting to qemu with "target remote
:1234", I get "0x001045ea in ?? (warning: (Internal error: pc 0x1045ea in read
in psymtab, but not in symtab.)" from gdb 7.1 and "Segmentation fault" from gdb
7.5.1 without anything else.

I would expect gdb to recognize 0x1045ea as being in Kernel.main as "dwarfdump
-a -vv" shows
<0><   11>    DW_TAG_compile_unit <abbrev 1>
        DW_AT_name                  Kernel
        DW_AT_producer              SJC
        DW_AT_language              DW_LANG_C
        DW_AT_low_pc                0x104320
        DW_AT_high_pc               0x108dd9
<0><   30>    DW_TAG_subprogram <abbrev 2>
        DW_AT_name                  main
        DW_AT_external              yes(1)
        DW_AT_low_pc                0x104320
        DW_AT_high_pc               0x1045ed

I think giving "Segmentation fault" is a bug in gdb. Additionally, if anyone
can suggest changes to get gdb accepting it, I would be very happy.

Thanks in advance! :-)

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