linux-kernel - [002/146] kmemleak: Initialise kmemleak after debug_objects_mem

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Message-Id: <20110601080227.610371509@blue.kroah.org>
Date:	Wed, 01 Jun 2011 16:58:58 +0900
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Catalin Marinas <catalin.marinas@....com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [002/146] kmemleak: Initialise kmemleak after debug_objects_mem_init()

2.6.38-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Catalin Marinas <catalin.marinas@....com>

commit 9b090f2da85bd0df5e1a1ecfe4120b7b50358f48 upstream.

Kmemleak frees objects via RCU and when CONFIG_DEBUG_OBJECTS_RCU_HEAD
is enabled, the RCU callback triggers a call to free_object() in
lib/debugobjects.c. Since kmemleak is initialised before debug objects
initialisation, it may result in a kernel panic during booting. This
patch moves the kmemleak_init() call after debug_objects_mem_init().

Reported-by: Marcin Slusarz <marcin.slusarz@...il.com>
Tested-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 init/main.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/init/main.c
+++ b/init/main.c
@@ -668,8 +668,8 @@ asmlinkage void __init start_kernel(void
 #endif
 	page_cgroup_init();
 	enable_debug_pagealloc();
-	kmemleak_init();
 	debug_objects_mem_init();
+	kmemleak_init();
 	setup_per_cpu_pageset();
 	numa_policy_init();
 	if (late_time_init)


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