a problem with gdb?

[Erming Pei]

Hi,
 When I was debuging a program withe gdb, it reported a problem as the 
following:
....
warning: Unexpected waitpid result 03057f when waiting for vfork-done
../../gdb-6.3/gdb/linux-nat.c:520: internal-error: unknown ptrace event 5
A problem internal to GDB has been detected,
further debugging may prove unreliable.
---Type <return> to continue, or q <return> to quit---
Quit this debugging session? (y or n) y

../../gdb-6.3/gdb/linux-nat.c:520: internal-error: unknown ptrace event 5
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Create a core file of GDB? (y or n) y
Abort

I've no idea on it----Is there anything wrong with my program or with GDB?
Could anyone give me a hint? Thanks a lot in advance.

my gdb version:
GNU gdb Red Hat Linux (6.3.0.0-0.30.1rh)


Erming