debugging threads

["Tim Michals" <tcmichals@verizon.net>]

Hello,

I'm trying to debug simple multithreaded app and get the following error:
[Thread debugging using libthread_db enabled]
Cannot find new threads: generic error

Can set break points and trace as shown below.
(gdb) 
Here is the info..

GNU gdb Red Hat Linux (6.6-15.fc7rh)
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This GDB was configured as "i386-redhat-linux-gnu"...
Using host libthread_db library "/lib/libthread_db.so.1".
(gdb) list
9       #include <iostream>
10
11      void helloworld(const char* who)
12      {
13          std::cout << who << "says, \"Hello World.\"" << std::endl;
14      }
15
16      int main()
17      {
18          boost::thread thrd(boost::bind(&helloworld, "Bob"));
(gdb) list
19          thrd.join();
20      }
21
(gdb) b main
Breakpoint 1 at 0x8048320: file ../helloworld.cpp, line 18.
(gdb) run
Starting program: /home/tcmichals/workspace/example/Debug/example
[Thread debugging using libthread_db enabled]
Cannot find new threads: generic error
(gdb) n
Single stepping until exit from function _start,
which has no line number information.
Cannot find user-level thread for LWP 3719: generic error
(gdb) n
Single stepping until exit from function _start,
which has no line number information.
Cannot find user-level thread for LWP 3719: generic error

The kernel version is:
Linux version 2.6.22.4-65.fc7 (kojibuilder@xenbuilder2.fedora.redhat.com)
(gcc v
ersion 4.1.2 20070502 (Red Hat 4.1.2-12)) #1 SMP Tue Aug 21 22:36:56 EDT
2007

Several posting on this issue i.e.
http://sourceware.org/ml/gdb/2007-08/msg00128.html