linux-kernel - Re: [Problem] kernel hangs at boot (bisected 892d208bcf)

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Date:	Fri, 20 Jan 2012 11:01:11 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Dirk Gouders <gouders@...bocholt.fh-gelsenkirchen.de>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Problem] kernel hangs at boot (bisected 892d208bcf)

On Thu, Jan 19, 2012 at 08:52:44PM +0000, Dirk Gouders wrote:
> Dirk Gouders <gouders@...bocholt.fh-gelsenkirchen.de> writes:
> I want to note that in my config CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF is
> set which causes kmemleak_disable() to be called in kmemleak_init().

Thanks for the investigation. Could you please try the patch below?
Thanks.


>From 09e7bd41ff3fd07e4c5eea7bbb0a045921eb5944 Mon Sep 17 00:00:00 2001
From: Catalin Marinas <catalin.marinas@....com>
Date: Fri, 20 Jan 2012 10:42:40 +0000
Subject: [PATCH] kmemleak: Disable early logging when kmemleak is off by
 default

Commit b6693005 (kmemleak: When the early log buffer is exceeded, report
the actual number) deferred the disabling of the early logging to
kmemleak_init(). However, when CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF=y, the
early logging was no longer disabled causing __init kmemleak functions
to be called even after the kernel freed the init memory. This patch
disables the early logging during kmemleak_init() if kmemleak is left
disabled.

Reported-by: Dirk Gouders <gouders@...bocholt.fh-gelsenkirchen.de>
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
---
 mm/kmemleak.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index f9f7310..45eb621 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -1757,6 +1757,7 @@ void __init kmemleak_init(void)
 
 #ifdef CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF
 	if (!kmemleak_skip_disable) {
+		atomic_set(&kmemleak_early_log, 0);
 		kmemleak_disable();
 		return;
 	}

-- 
Catalin
--
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