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authorEric W. Biederman <ebiederm@xmission.com>2013-03-26 02:27:11 -0700
committerEric W. Biederman <ebiederm@xmission.com>2013-03-26 03:41:23 -0700
commit751c644b95bb48aaa8825f0c66abbcc184d92051 (patch)
treeac5fa98b0281b5c8db1ac5859d15ac5c2b22e5f4
parent92f28d973cce45ef5823209aab3138eb45d8b349 (diff)
downloadlinux-751c644b95bb48aaa8825f0c66abbcc184d92051.tar.bz2
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 <oleg@redhat.com> Reported-by: Caj Larsson <caj@omnicloud.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
-rw-r--r--kernel/pid_namespace.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index c1c3dc1c6023..bea15bdf82b0 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();
}