linux-kernel - [PATCH 0/2] wait: WSTOPPED & ptrace fixes

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Message-ID: <20140226165504.GA22677@redhat.com>
Date:	Wed, 26 Feb 2014 17:55:04 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	Jan Kratochvil <jan.kratochvil@...hat.com>,
	Lennart Poettering <lpoetter@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Michal Schmidt <mschmidt@...hat.com>,
	Roland McGrath <roland@...k.frob.com>,
	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] wait: WSTOPPED & ptrace fixes

On 02/20, Oleg Nesterov wrote:
>
> Tejun, unless I missed something WSTOPPED logic is broken if a process
> has a zombie/ptraced leader, "A zombie ptracee is only visible to its
> ptracer" is wrong in this case. Plus perhaps some cleanups make sense.

In fact it is broken even if it the child/tracee is single-threaded.

And I failed to find a simple fix which is not visible to user-space.
It would be nice if you can ack/nack at least the changelog in 1/2,
I mean the note about SIGNAL_STOP_CONTINUED.

And unless I missed something WEXITED is broken too, so I'll probably
send more changes.

Oleg.

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