Re: [PATCH 02/10] job control: introduce JOBCTL_TRAP_STOP and useit for group stop trap

From: Oleg Nesterov
Date: Wed May 18 2011 - 12:58:56 EST

On 05/18, Oleg Nesterov wrote:
> So far I can't really understand why do we have both JOBCTL_TRAP_STOP and
> and JOBCTL_TRAPPING... Please ignore, I didn't read other patches yet.


> Hmm. And afaics there is a bug in do_signal_stop(), after
> "[PATCH 6/9] job control: make task_clear_jobctl_pending() clear TRAPPING automatically"
> ->jobctl &= ~JOBCTL_STOP_SIGMASK is no longer safe. We can clear _TRAPPING
> without wakeup.

And this also affects ptrace_attach(PTRACE_SEIZE), TRAP_STOP is cleared
as well.


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