Re: Q: GDB - Threads

[Hui Zhu <teawater@gmail.com>]

http://sourceware.org/gdb/current/onlinedocs/gdb_5.html#SEC28
http://sourceware.org/gdb/wiki/FAQ

GDB does not see any threads besides the one in which crash occurred;
or SIGTRAP kills my program when I set a breakpoint.

    * This frequently happen on Linux, especially on embedded targets.
There are two common causes:
          o

            you are using glibc, and you have stripped libpthread.so.0
          o

            mismatch between libpthread.so.0 and libthread_db.so.1

      GDB itself does not know how to decode "thread control blocks"
maintained by glibc and considered to be glibc private implementation
detail. It uses libhread_db.so.1 (part of glibc) to help it do so.
Therefore, libthread_db.so.1 and libpthread.so.0 must match in version
and compilation flags.

      In addition, libthread_db.so.1 requires certain non-global
symbols to be present in libpthread.so.0.

      Solution: use strip --strip-debug libpthread.so.0 instead of
strip libpthread.so.0.




On Wed, May 27, 2009 at 00:02, Vellemans, Noel
<Noel.Vellemans@visionbms.com> wrote:
>
> Hi,
>
> Somebody who can point me to a document (URL) that contains some info
> about GDB-(server)debugging with threads ?
>
> I'm having problems debugging multithread applications (compiled for
> ARM).
>
>
> Ref to :  http://sourceware.org/ml/gdb/2009-05/msg00137.html
>
>
>
> GDB-6.8 (for ARM).
>
> /toolchain_build_arm/gdbhost-6.8/gdb$ ./gdb --v
> GNU gdb 6.8
> 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 "--host=i386-pc-linux-gnu
> --target=arm-linux-uclibc".
>
>
>
>
>
>
>
>
> Kind Regards,
> Noel.
>
>
>