Re: Cannot find new threads: generic error

[Laurent Carlier <lordheavym at gmail dot com>]

Le Thursday 28 August 2008 15:53:36 Laurent Carlier, vous avez Ãcrit :
> Sorry if i break the thread, i find these mails wihile seraching about this
> problem.
>
> I got the same problem when running gdb with a program using dlopen() too
> and under debian sid (the same problem occur under the last ubuntu release)
>
> I've filled a bug report on debian bug tracking system:
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=496494
>
> So the output from gdb is:
> lordh@debian:~/gb2projets/TunnelSDL$ gdb gbx3
> GNU gdb 6.8-debian
> Copyright (C) 2008 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later
> <http://gnu.org/licenses/gpl.html> This is free software: you are free to
> change and redistribute it. There is NO WARRANTY, to the extent permitted
> by law.  Type "show copying" and "show warranty" for details.
> This GDB was configured as "x86_64-linux-gnu"...
> (gdb) run -p
> Starting program: /usr/local/bin/gbx3 -p
> [Thread debugging using libthread_db enabled]
> Error while reading shared library symbols:
> Cannot find new threads: generic error
> Cannot find new threads: generic error
> (gdb) bt
> #0  0x00007ff0873787b7 in dl_open_worker () from
> /lib64/ld-linux-x86-64.so.2 #1  0x00007ff087374366 in _dl_catch_error ()
> from /lib64/ld-linux-x86-64.so.2 #2  0x00007ff0873780eb in _dl_open () from
> /lib64/ld-linux-x86-64.so.2 #3  0x00007ff086ee0fbb in dlopen_doit () from
> /lib/libdl.so.2
> #4  0x00007ff087374366 in _dl_catch_error () from
> /lib64/ld-linux-x86-64.so.2 #5  0x00007ff086ee136c in _dlerror_run () from
> /lib/libdl.so.2
> #6  0x00007ff086ee0f21 in dlopen@@GLIBC_2.2.5 () from /lib/libdl.so.2
> #7  0x0000000000420685 in LIBRARY_load (lib=0x15dd400) at gbx_library.c:468
> #8  0x0000000000441f4b in COMPONENT_load (comp=0x15dd3a0) at
> gbx_component.c:250
> #9  0x0000000000441b22 in COMPONENT_load_all () at gbx_component.c:110
> #10 0x000000000041fd5f in PROJECT_load () at gbx_project.c:456
> #11 0x0000000000432d2e in init (file=0x446378 ".") at gbx.c:85
> #12 0x00000000004332ef in main (argc=1, argv=0x7fff8f582968) at gbx.c:299
> (gdb)
>
> >>  [Thread debugging using libthread_db enabled]
> >>  Error while reading shared library symbols:
> >>  Cannot find new threads: generic error
> >>
> >> I'm using kernel 2.6.24 on a recent debian/unstable libc6.
> >>
> >> Where does that error come from?
> >
> >This is most often the result of either
> >A. mismatch between libc.so.6 and libthread_db.so.1, or
> >B. libpthread.so.0 being stripped.
> >
> >What does 'nm /lib/libpthread.so.0 | grep _version' say?
>
> The output is:
> lordh@debian:~$ nm /lib/libpthread.so.0 | grep _version
> 0000000000010420 r nptl_version
>
> Regards,

I've find a workaround, i've link the debugging app with libpthread and now gdb 
feels happy, and i can run it with gdb !

Does anybody got an idea how to fix definitivly this problem ?

Thank for your advices.

Regards,
Laurent Carlier