Why won't gdb stop on packed (UPX) file breakpoint at entrypoint?

[Daniel Jacobowitz]

On Wed, Mar 26, 2008 at 04:57:02PM -0400, gdb guy wrote:
> (gdb) b *0xc07fd0
> Breakpoint 1 at 0xc07fd0
> (gdb) r

Known bug (well, sort of a bug, sort of a feature) in GDB.  Use x/2i
0xc07fd0 and set the breakpoint at the second instruction.

> Also, just for my own benefit, and those who google after me, on GDB
> 6.3 (which I have on another older VM) what does DSO stand for when it
> says "Loading system supplied DSO at 0xc00000"?

Dynamic Shared Object.  Google for vDSO.

-- 
Daniel Jacobowitz
CodeSourcery