Re: multithreaded remote debugging

[Daniel Jacobowitz <drow@mvista.com>]

On Fri, Jan 17, 2003 at 03:09:11PM +0100, Frank van Eijkelenburg wrote:
> > -----Original Message-----
> > From: gdb-owner@sources.redhat.com
> > [mailto:gdb-owner@sources.redhat.com]On Behalf Of Daniel Jacobowitz
> > Sent: vrijdag 17 januari 2003 14:54
> > To: Frank van Eijkelenburg
> > Cc: Gnu Debugger mailing list
> > Subject: Re: multithreaded remote debugging
> >
> >
> > On Fri, Jan 17, 2003 at 12:29:16PM +0100, Frank van Eijkelenburg wrote:
> > > Hi, I'm new to gdb. I try to remote debug an application:
> > >
> > > I have a linux machine with redhat installed (2.4.7-10), this
> > is the host.
> > > On the target an ARM processor is running with linux kernel 2.4.16. I
> > > compiled gdb on the host (with target arm-linux). I also cross-compiled
> > > gdbserver. My application (which I want to debug) is compiled
> > with compiler
> > > option -g. I can start the gdbserver on the target and gdb on
> > the host and
> > > have a connection by tcp/ip. The application is multithreaded
> > and uses the
> > > libpthread library. If I ignore the SIG32 signal (with "handle
> > SIG32 nostop"
> > > and "handle SIG32 noprint") I can run the application. However,
> > if I try to
> > > execute "info threads" I only get information about one thread (the main
> > > thread??). I can put breakpoints in the main thread and step through the
> > > code, but if I put a breakpoint in another thread, the debugger
> > will stop,
> > > but I cannot step through the code:
> > >
> > > Program received signal SIGTRAP, Trace/breakpoint trap.
> > > 0x400ab2e4 in ?? ()
> > > (gdb) n
> > > Cannot find bounds of current function
> > >
> > > What do I wrong or is it not possible to step through the code of other
> > > threads beside the main thread?
> >
> > You neglected to say what version you're using.  We only got support
> > for remote thread debugging between GDB 5.2 and 5.3; if you aren't
> > using 5.3, you should try it.
> >
> 
> Sorry about that. I am using GDB version 5.3 with the above described
> problems.

Do you have libthread_db installed on your target, and on your cross
development system so that gdbserver can link to it?  Look at the
output of "configure" in the gdbserver directory, or at config.log.


-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer