gdb doesnt show nptl threads

[Michael Snyder]

On Wed, 2008-06-11 at 14:38 -0700, Srinivas Murthy wrote:

> (gdb) break main
> Breakpoint 1 at 0x4006e0: file main.c, line 29.
> (gdb) r
> Starting program: thread
> Failed to read a valid object file image from memory.

Well, there's the first thing I notice...

This code's completely unfamiliar to me, but I see some comments
about "try to add the symbols for the vsyscall page".

Anybody know about that?