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 0/5] kill the racy EXIT_ZOMBIE->EXIT_DEAD->EXIT_ZOMBIE transition
Date: Thu, 20 Feb 2014 18:38:38 +0100 [thread overview]
Message-ID: <20140220173838.GA21825@redhat.com> (raw)
Hello.
1/7 cc's stable, and imo it is v3.14 material. This hack is reverted
by the next patch.
Many thanks to Michal and Jan for investigating.
And it seems that we need more (unrelated) changes in do_wait(), will
try to do this tomorrow.
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.
Oleg.
fs/proc/array.c | 4 +-
include/linux/sched.h | 5 ++-
kernel/exit.c | 51 +++++++++++++++++++++++-------------------------
3 files changed, 29 insertions(+), 31 deletions(-)
next reply other threads:[~2014-02-20 17:38 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-20 17:38 Oleg Nesterov [this message]
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 ` [PATCH 0/2] wait: WSTOPPED & ptrace fixes Oleg Nesterov
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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