From: Oleg Nesterov <oleg@redhat.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Al Viro <viro@ZenIV.linux.org.uk>,
Jan Kratochvil <jan.kratochvil@redhat.com>,
Lennart Poettering <lpoetter@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Michal Schmidt <mschmidt@redhat.com>,
Roland McGrath <roland@hack.frob.com>, Tejun Heo <tj@kernel.org>,
linux-kernel@vger.kernel.org
Subject: [PATCH 0/2] wait: WSTOPPED & ptrace fixes
Date: Wed, 26 Feb 2014 17:55:04 +0100 [thread overview]
Message-ID: <20140226165504.GA22677@redhat.com> (raw)
In-Reply-To: <20140220173838.GA21825@redhat.com>
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.
next prev parent reply other threads:[~2014-02-26 16:55 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-20 17:38 [PATCH 0/5] kill the racy EXIT_ZOMBIE->EXIT_DEAD->EXIT_ZOMBIE transition Oleg Nesterov
2014-02-20 17:38 ` [PATCH 1/5] wait: fix reparent_leader() vs EXIT_DEAD->EXIT_ZOMBIE race Oleg Nesterov
2014-02-20 17:39 ` [PATCH 2/5] wait: introduce EXIT_TRACE to avoid the racy EXIT_DEAD->EXIT_ZOMBIE transition Oleg Nesterov
2014-02-20 17:39 ` [PATCH 3/5] wait: use EXIT_TRACE only if thread_group_leader(zombie) Oleg Nesterov
2014-02-20 17:39 ` [PATCH 4/5] wait: completely ignore the EXIT_DEAD tasks Oleg Nesterov
2014-02-20 17:39 ` [PATCH 5/5] wait: swap EXIT_ZOMBIE and EXIT_DEAD to hide EXIT_TRACE from user-space Oleg Nesterov
2014-02-20 19:48 ` [PATCH 0/5] kill the racy EXIT_ZOMBIE->EXIT_DEAD->EXIT_ZOMBIE transition Tejun Heo
2014-02-24 15:51 ` Oleg Nesterov
2014-02-26 16:55 ` Oleg Nesterov [this message]
2014-02-26 16:55 ` [PATCH 1/2] wait: WSTOPPED|WCONTINUED hangs if a zombie child is traced by real_parent Oleg Nesterov
2014-02-26 16:56 ` [PATCH 2/2] wait: WSTOPPED|WCONTINUED doesn't work if a zombie leader is traced by another process Oleg Nesterov
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