From: Oleg Nesterov <oleg@redhat.com>
Date: Thu, 2 Apr 2009 23:58:17 +0000 (-0700)
Subject: reparent_thread: fix a zombie leak if /sbin/init ignores SIGCHLD
X-Git-Tag: v2.6.30-rc1~327
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7f5d3652d469cdf9eb2365dfea7ce3fb9e1409cc;p=pandora-kernel.git

reparent_thread: fix a zombie leak if /sbin/init ignores SIGCHLD

If /sbin/init ignores SIGCHLD and we re-parent a zombie, it is leaked.
reparent_thread() does do_notify_parent() which sets ->exit_signal = -1 in
this case.  This means that nobody except us can reap it, the detached
task is not visible to do_wait().

Change reparent_thread() to return a boolean (like __pthread_detach) to
indicate that the thread is dead and must be released.  Also change
forget_original_parent() to add the child to ptrace_dead list in this
case.

The naming becomes insane, the next patch does the cleanup.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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