handle the multi-threaded init's exit() properly
With or without this patch, multi-threaded init's are not fully supported,
but do_exit() is completely wrong. This becomes a real problem when we
support pid namespaces.
1. do_exit() panics when the main thread of /sbin/init exits. It should not
until the whole thread group exits. Move the code below, under the
"if (group_dead)" check.
Note: this means that forget_original_parent() can use an already dead
child_reaper()'s task_struct. This is OK for /sbin/init because
- do_wait() from alive sub-thread still can reap a zombie, we iterate
over all sub-thread's ->children lists
- do_notify_parent() will wakeup some alive sub-thread because it sends
the group-wide signal
However, we should remove choose_new_parent()->BUG_ON(reaper->exit_state)
for this.
2. We are playing games with ->nsproxy->pid_ns. This code is bogus today, and
it has to be changed anyway when we really support pid namespaces, just
remove it.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Roland McGrath <roland@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Cc: Serge Hallyn <serue@us.ibm.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 file changed