Re: pthreads debug with gdbserver

Daniel Jacobowitz
2004-11-20T01:32:33Z

On Fri, Nov 19, 2004 at 04:41:15PM +0200, Vladimir Vorobyov wrote:
> On Friday 19 November 2004 04:22 pm, Daniel Jacobowitz wrote:
> > On Fri, Nov 19, 2004 at 12:33:22PM +0200, Vladimir Vorobyov wrote:
> > > I see that shlib breakpoint is set and hit but gdb does not load the
> > > libraries. I can see in strace that it successfully loads ld.so. What
> > > should I look at?
>
> > "info shared". Maybe strace GDB to see what it's opening and whether
> > it fails to find any files.
>
> info shared reports: "No shared libraries loaded at this time".
> Straces shows that gdb opens only ld.so file.
> When adding printf to solibopen it also shows only ld.so.
> Who is responsible for loading shared libs ? What file/function/event?

This usually means that the ld.so GDB has opened is not -exactly- the
same as the one on your target; and then it has set the solib event
breakpoint at the wrong location, and it hasn't been hit. Take a look
at solib-svr4.c if you want more details.

> Yes, the problem number one is that GDB does not auto loads shared libs.
> Is it not the same when I manually add-symbol-file lipthread.so? Can I do it
> to load shared libs ?
> When I do this I got "gbd: error initializing thread_db library." error on the
> target. When I add debug info to it, I see that error is "Incompatible
> versions of libpthread and libthread_db". But these two libs are from the
> same libc.
> It looks like this is my second problem. Or it depends on first one and may
> disappear when first problem is solved?

Are you sure you loaded the right copy?

--
Daniel Jacobowitz