Re: thread-debuging with gdbserver on ARM/NPTL

[Luotao Fu <l dot fu at pengutronix dot de>]

Hi,

On Wed, Oct 25, 2006 at 11:03:44AM -0400, Daniel Jacobowitz wrote:
> On Wed, Oct 25, 2006 at 04:45:29PM +0200, Robert Schwebel wrote:
> > Here are some more details about the problem. It turned out that it
> > works if you link against libpthread dynamically and doesn't with
> > -static.
> 
> Oh, right.  Thread debugging of static applications using NPTL is
> particularly problematic.  Take a look at this, for starters:
> 
>   http://sourceware.org/bugzilla/show_bug.cgi?id=2696

We built a Toolchain with gcc4.1.1+glibc2.5+gdb-6.5.50.20061025 using
the patch posted on
http://sourceware.org/ml/libc-alpha/2006-03/msg00014.html and did the
same test as already described in robert's mail again. Unluckiely the 
problems with static binary seems to still consist. On the host 
side gdb would stuck at first continue, while on the target side 
gdbserver prints something like "Cannot enable thread event reporting 
for [PID of the testapp]: generic error". 

I however noticed that the test can be run if there's no symboltable
given on the host side. (say gdb is started without any parameter or
arguments) In this case I can process between the continues sending 
SIGINT.

I logged the outputs and used commands to a log file and enclose it in
the attachment. 
> 
> -- 
> Daniel Jacobowitz
> CodeSourcery

Regards
Luotao Fu
-- 
     Dipl.-Ing. Luotao Fu | http://www.pengutronix.de
  Pengutronix - Linux Solutions for Science and Industry
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