Re: Beginner question regarding gdb symbol files

["luca regini" <luca.regini@gmail.com>]

The server is an openldap server. The binary comes directly from the
fedora package for it. My plugin is a custom openldap backend that is
loaded into the server using a libtool facility: lt_dlopenext.
This is the output that i get when i try run gdb slapd immediatly:

gdb slapd
(gdb) start
Breakpoint 1 at 0x14bc7: file ../../../servers/slapd/main.c, line 304.
Starting program: /opt/six/sbin/slapd
Warning:
Cannot insert breakpoint 1.
Error accessing memory address 0x14bc7: Input/output error.

This is what i got when i try to attach to the process:

 (gdb) attach 29764
Attaching to process 29764
Reading symbols from /opt/six/sbin/slapd...Reading symbols from
/opt/six/sbin/slapd.dbg...done.
Using host libthread_db library "/lib/tls/libthread_db.so.1".
done.
0x00116c68 in hex ()
(gdb)
.

If i compile openldap directly from the sources i don't have any
problem. These problems show up when i use the fedora openldap rpm
also with the debug-info package is installed.
Thanks in advance.
Luca

On Thu, Feb 28, 2008 at 8:35 PM, Michael Snyder <msnyder@specifix.com> wrote:
>
> On Thu, 2008-02-28 at 11:59 -0500, Daniel Jacobowitz wrote:
>  > On Thu, Feb 28, 2008 at 05:52:42PM +0100, luca regini wrote:
>  > > >
>  > > >  --add-gnu-debuglink is not related to this situation.  GDB should
>  > > >  automatically load symbols for your plugin when the application loads
>  > > >  it.  What doesn't work?
>  > > >
>  > >
>  > > The plug-in is loaded dynamically by the server application so it runs
>  > > in the server application address space. When i try to attach to the
>  > > server application gdb displays a message about a successeful load of
>  > > the symbols but then complains about missing source files, then i am
>  > > not able to set a breakpoint in the source of the plug-in.
>  >
>  > Sorry, this is not enough information.  We need the exact output from
>  > GDB to help you.
>
>  Yes, please attach a log of your gdb session.
>  Thanks.
>
>  You say you're using attach?
>  What happens if you launch the server under gdb?
>  What happens if you attach to the server before it dlopens the plugin?
>  (I assume you're using dlopen...)
>
>
>