releases/2.6.34.11/init-sched-Fix-race-between-init-and-kthreadd.patch

From 8b72ec6671d9b4a1a878e4d22ed4c2050d2480cd Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz@infradead.org>
Date: Mon, 28 Jun 2010 16:51:01 +0200
Subject: [PATCH] init, sched: Fix race between init and kthreadd

commit b433c3d4549ae74935b585115f076c6fb7bc48fe upstream.

Ilya reported that on a very slow machine he could reliably
reproduce a race between forking init and kthreadd. We first
fork init so that it  obtains pid-1, however since the scheduler
is already fully running at this point it can preempt and run
the init thread before we spawn and set kthreadd_task.

The init thread can then attempt spawning kthreads without
kthreadd being present which results in an OOPS.

Reported-by: Ilya Loginov <isloginov@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <1277736661.3561.110.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/init/main.c b/init/main.c
index 5c85402..df0e20b 100644
--- a/init/main.c
+++ b/init/main.c
@@ -421,18 +421,26 @@ static void __init setup_command_line(char *command_line)
  * gcc-3.4 accidentally inlines this function, so use noinline.
  */
 
+static __initdata DECLARE_COMPLETION(kthreadd_done);
+
 static noinline void __init_refok rest_init(void)
 	__releases(kernel_lock)
 {
 	int pid;
 
 	rcu_scheduler_starting();
+	/*
+	 * We need to spawn init first so that it obtains pid-1, however
+	 * the init task will end up wanting to create kthreads, which, if
+	 * we schedule it before we create kthreadd, will OOPS.
+	 */
 	kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
 	numa_default_policy();
 	pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
 	rcu_read_lock();
 	kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
 	rcu_read_unlock();
+	complete(&kthreadd_done);
 	unlock_kernel();
 
 	/*
@@ -853,6 +861,10 @@ static noinline int init_post(void)
 
 static int __init kernel_init(void * unused)
 {
+	/*
+	 * Wait until kthreadd is all set-up.
+	 */
+	wait_for_completion(&kthreadd_done);
 	lock_kernel();
 
 	/*
-- 
1.7.7