[Bug gdb/16822] Segmentation fault on add-symbol-file command

["qiyao at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16822

Yao Qi <qiyao at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |qiyao at gcc dot gnu.org

--- Comment #1 from Yao Qi <qiyao at gcc dot gnu.org> ---
(In reply to Ulises Brindis from comment #0)
> Using GDB version 7.7 compiled with --host=arm-linux-gnueabi and
> --target=tic6x-ti-elf there is a segmentation fault when attempting to add a
> symbol file generated by TI C6x compiler version 7.4.4. I did not notice the
> segmentation fault in GDB version 7.2.

tic6x-*-* target was added in FSF GDB 7.4.  GDB 7.2 with tic6x target shouldn't
be an official FSF release.

> 
> Debugging into GDB a bit I notice that the seg fault comes from
> dwarf2read.c. On line 8464 the function dwarf2_attr returns a non-null but
> unusable attr. I have searched through my symbol file and I notice that for
> the specific DIE, there is no DW_AT_MIPS_linkage_name specified. I suspect
> that the null detecting condition needs reworking (line 8472 in
> dwarf2read.c). This then causes gdb_demangled to be called with a bad
> argument. I am not exactly sure how to fix this issue, so I am posting it
> here.

We need a reproducer to see the root cause of this problem.  It may be a GDB
problem or a compiler problem.  If possible, please attach a small executable
to cause GDB segmentation fault, and list your steps.

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