---Problem Description---
Gdb cant singlestep over pthread function
 
---uname output---
Linux devel 2.6.18-8.1.1.el5 #1 SMP Mon Feb 26 20:42:34 EST 2007 ppc64 ppc64
ppc64 GNU/Linux
 
---Steps to Reproduce---
[root@devel gdb]# cat test.c
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>

void *tf( void *ptr )
{
     char *ptr1;
     ptr1 = (char *) ptr;
     printf("%s \\n", ptr1);
}

main()
{
     pthread_t thread;
     char *ptr = "Thread";
     int  iret;

     iret = pthread_create( &thread, NULL, tf, (void*)ptr);

     pthread_join( thread, NULL);

     printf("Thread returns: %d\\n",iret);
     exit(0);
}

=== 32bit ===

[root@devel gdb]# gcc -g -o test.32 test.c -lpthread
[root@devel gdb]# gdb -q test.32
Using host libthread_db library "/lib64/libthread_db.so.1".
(gdb) b main
Breakpoint 1 at 0x100005ac: file test.c, line 15.
(gdb) b tf
Breakpoint 2 at 0x10000564: file test.c, line 8.
(gdb) r
Starting program: /home/public/test-tools/gdb/test.32
[Thread debugging using libthread_db enabled]
[New Thread 268377056 (LWP 32324)]
[Switching to Thread 268377056 (LWP 32324)]

Breakpoint 1, main () at test.c:15
15           char *ptr = "Thread";
(gdb) n
18           iret = pthread_create( &thread, NULL, tf, (void*)ptr);
(gdb) n
[New Thread 4160681152 (LWP 32327)]
20           pthread_join( thread, NULL);
(gdb) n
[Switching to Thread 4160681152 (LWP 32327)]

Breakpoint 2, tf (ptr=0x10000a68) at test.c:8
8            ptr1 = (char *) ptr;
(gdb) n
9            printf("%s \\n", ptr1);
(gdb) n
Thread
10      }
(gdb) n
0x0fcf66d4 in start_thread () from /lib/libpthread.so.0
(gdb) n
Single stepping until exit from function start_thread,
which has no line number information.
0x0fd02860 in call___do_global_ctors_aux () from /lib/libpthread.so.0
(gdb) n
Single stepping until exit from function call___do_global_ctors_aux,
which has no line number information.
0x0ffd4e1c in _dl_runtime_resolve () from /lib/ld.so.1
(gdb) n
Single stepping until exit from function _dl_runtime_resolve,
which has no line number information.
0x0ff7b5a0 in __libc_thread_freeres () from /lib/libc.so.6
(gdb) n
Single stepping until exit from function __libc_thread_freeres,
which has no line number information.
0x0fcf66e0 in start_thread () from /lib/libpthread.so.0
(gdb) n
Single stepping until exit from function start_thread,
which has no line number information.
                      ----------> hangs here

=== 64bit === 

[root@devel gdb]# gcc -g -m64 -o test.64 test.c -lpthread
[root@devel gdb]# gdb -q test.64
Using host libthread_db library "/lib64/libthread_db.so.1".
(gdb) b main
Breakpoint 1 at 0x100006e8: file test.c, line 15.
(gdb) b tf
Breakpoint 2 at 0x1000069c: file test.c, line 8.
(gdb) r
Starting program: /home/public/test-tools/gdb/test.64
[Thread debugging using libthread_db enabled]
[New Thread 553248246304 (LWP 32351)]
[Switching to Thread 553248246304 (LWP 32351)]

Breakpoint 1, main () at test.c:15
15           char *ptr = "Thread";
(gdb) n
18           iret = pthread_create( &thread, NULL, tf, (void*)ptr);
(gdb) n
[New Thread 4398057189936 (LWP 32356)]
20           pthread_join( thread, NULL);
(gdb) n
[Switching to Thread 4398057189936 (LWP 32356)]

Breakpoint 2, tf (ptr=0x10000958) at test.c:8
8            ptr1 = (char *) ptr;
(gdb) n
9            printf("%s \\n", ptr1);
(gdb) n
Thread
10      }
(gdb) n
0x00000080d057b808 in .start_thread () from /lib64/libpthread.so.0
(gdb) n
Single stepping until exit from function .start_thread,
which has no line number information.
                      ----------> hangs here

 
---GDB - Power Component Data---
Userspace tool common name: gdb

The userspace tool has the following bit modes: both 32 and 64-bit modes

Userspace rpm: gdb-6.5-16.el5

-- Additional comment on 2007-04-04 08:32 EST --
Sending up... This is reproducible. If a box on which this can be
reproduced is required, I can provide the details.