On Mon, Sep 26, 2011 at 07:06:32PM +0200, Oleg Nesterov wrote:

> https://bugzilla.redhat.com/show_bug.cgi?id=740121

> 

> 1. Luke Macken triggered WARN_ON(!(group_stop & GROUP_STOP_SIGMASK))

>    in do_signal_stop().

> 

>    This is because do_signal_stop() clears GROUP_STOP_SIGMASK part

>    unconditionally but doesn't update it if task_is_stopped().

> 

> 2. Looking at this problem I noticed that WARN_ON_ONCE(!ptrace) is

>    not right, a stopped-but-resumed tracee can clone the untraced

>    thread in the SIGNAL_STOP_STOPPED group, the new thread can start

>    another group-stop.

> 

>    Remove this warning, we need more fixes to make it true.

> 

> Reported-by: Luke Macken <lmacken_at_redhat.com>

> Signed-off-by: Oleg Nesterov <oleg_at_redhat.com>

I still don't understand, did this fix ever get into Linus's tree?  If

so, what is the git commit id.

If not, why not?  I can't apply it to the 3.0-stable tree unless it is

there, or there is a very good reason why it isn't.

thanks,

greg k-h

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