The patch titled
put_pid: make sure we don't free the live pid
has been removed from the -mm tree. Its filename was
put_pid-make-sure-we-dont-free-the-live-pid.patch
This patch was dropped because it was withdrawn
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: put_pid: make sure we don't free the live pid
From: Oleg Nesterov <oleg@xxxxxxxxxx>
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@xxxxxxxxxx>
Cc: Roland McGrath <roland@xxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxx>
Cc: Kamalesh Babulal <kamalesh@xxxxxxxxxxxxxxxxxx>
Cc: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
Cc: Valdis.Kletnieks@xxxxxx
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/pid.c | 4 ++++
1 file changed, 4 insertions(+)
diff -puN kernel/pid.c~put_pid-make-sure-we-dont-free-the-live-pid kernel/pid.c
--- a/kernel/pid.c~put_pid-make-sure-we-dont-free-the-live-pid
+++ a/kernel/pid.c
@@ -210,6 +210,10 @@ 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);
}
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
signals-fix-sigqueue_free-vs-__exit_signal-race.patch
uml-activate_mm-remove-the-dead-pf_borrowed_mm-check.patch
posix-timers-timer_delete-remove-the-bogus-it_process-=-null-check.patch
posix-timers-release_posix_timer-kill-the-bogus-put_task_struct-it_process.patch
signals-sigqueue_free-dont-free-sigqueue-if-it-is-queued.patch
signals-introduce-sigqueue_cancelled.patch
posix-timers-use-sigqueue_cancelled-when-the-timer-is-destroyed.patch
signals-collect_signal-remove-the-unneeded-sigismember-check.patch
signals-collect_signal-simplify-the-still_pending-logic.patch
put_pid-make-sure-we-dont-free-the-live-pid.patch
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