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Subject[PATCH] (for -mm only) put_pid: make sure we don't free the live pid
[PATCH] (for -mm only) put_pid: make sure we don't free the live pid

Add the temporary (for -mm only) debugging code to catch the unbalanced
put_pid()'s. At least those which can free the "live" pid.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>

--- MM/kernel/pid.c~ 2008-02-20 18:29:40.000000000 +0300
+++ MM/kernel/pid.c 2008-02-20 18:35:15.000000000 +0300
@@ -208,6 +208,10 @@ void put_pid(struct pid *pid)
ns = pid->numbers[pid->level].ns;
if ((atomic_read(&pid->count) == 1) ||
atomic_dec_and_test(&pid->count)) {
+ int type = PIDTYPE_MAX;
+ while (--type >= 0)
+ if (WARN_ON(!hlist_empty(&pid->tasks[type])))
+ return;
kmem_cache_free(ns->pid_cachep, pid);
put_pid_ns(ns);
}


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