A signal delivery to a thread is not working
properly in the kernel when a signal 
handler is specified. Here is the case:
A process blocks all signals and registers
a handler for a signal. 
A newly created thread unblocks that signal.
When that signal is sent to a process, the 
sighandler is not getting called.
(if this signal is sent twice, it works)
  
I've attached a small test program to reproduce 
it using NPTL. 
The following patch fixes this problem in kernel.
Please apply.

Thanks,
Saurabh Desai