From: Eric W. Biederman Date: Tue, 26 Mar 2013 09:27:11 +0000 (-0700) Subject: pid: Handle the exit of a multi-threaded init. X-Git-Tag: v3.9-rc5~21^2~6 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=751c644b95bb48aaa8825f0c66abbcc184d92051;p=profile%2Fcommon%2Fkernel-common.git pid: Handle the exit of a multi-threaded init. When a multi-threaded init exits and the initial thread is not the last thread to exit the initial thread hangs around as a zombie until the last thread exits. In that case zap_pid_ns_processes needs to wait until there are only 2 hashed pids in the pid namespace not one. v2. Replace thread_pid_vnr(me) == 1 with the test thread_group_leader(me) as suggested by Oleg. Cc: stable@vger.kernel.org Cc: Oleg Nesterov Reported-by: Caj Larsson Signed-off-by: "Eric W. Biederman" --- diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c index c1c3dc1..bea15bd 100644 --- a/kernel/pid_namespace.c +++ b/kernel/pid_namespace.c @@ -181,6 +181,7 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns) int nr; int rc; struct task_struct *task, *me = current; + int init_pids = thread_group_leader(me) ? 1 : 2; /* Don't allow any more processes into the pid namespace */ disable_pid_allocation(pid_ns); @@ -230,7 +231,7 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns) */ for (;;) { set_current_state(TASK_UNINTERRUPTIBLE); - if (pid_ns->nr_hashed == 1) + if (pid_ns->nr_hashed == init_pids) break; schedule(); }