From: Oleg Nesterov <oleg@tv-sign.ru>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
roland@redhat.com, linux-kernel@vger.kernel.org,
Pavel Emelyanov <xemul@openvz.org>,
Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
Valdis.Kletnieks@vt.edu
Subject: [PATCH] (for -mm only) put_pid: make sure we don't free the live pid
Date: Wed, 20 Feb 2008 19:14:39 +0300 [thread overview]
Message-ID: <20080220161439.GA146@tv-sign.ru> (raw)
In-Reply-To: <23492.1203464394@turing-police.cc.vt.edu>
[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);
}
next prev parent reply other threads:[~2008-02-20 16:33 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-15 18:02 [PATCH] do_signal_stop: use signal_group_exit() Oleg Nesterov
2008-02-16 3:37 ` Andrew Morton
2008-02-16 14:02 ` Oleg Nesterov
2008-02-17 23:10 ` Oleg Nesterov
2008-02-18 4:11 ` Eric W. Biederman
2008-02-19 23:39 ` Valdis.Kletnieks
2008-02-20 16:14 ` Oleg Nesterov [this message]
2008-02-20 16:18 ` tty && pid problems Oleg Nesterov
2008-02-20 16:19 ` Alan Cox
2008-02-22 1:39 ` Eric W. Biederman
2008-02-22 9:37 ` Alan Cox
2008-02-20 16:28 ` Oleg Nesterov
2008-02-20 19:00 ` Jiri Slaby
2008-02-20 2:32 ` [PATCH] do_signal_stop: use signal_group_exit() Eric W. Biederman
2008-02-16 15:09 ` [PATCH] free_pidmap: turn it into free_pidmap(struct upid *) Oleg Nesterov
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