From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail191.messagelabs.com (mail191.messagelabs.com [216.82.242.19]) by kanga.kvack.org (Postfix) with SMTP id D2F656B004F for ; Sun, 13 Sep 2009 19:11:45 -0400 (EDT) Subject: Re: [GIT BISECT] BUG kmalloc-8192: Object already free from kmem_cache_destroy From: Eric Paris In-Reply-To: <1252866835.13780.37.camel@dhcp231-106.rdu.redhat.com> References: <1252866835.13780.37.camel@dhcp231-106.rdu.redhat.com> Content-Type: text/plain; charset="UTF-8" Date: Sun, 13 Sep 2009 19:11:33 -0400 Message-Id: <1252883493.16335.8.camel@dhcp231-106.rdu.redhat.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: cl@linux-foundation.org Cc: dfeng@redhat.com, penberg@cs.helsinki.fi, mingo@elte.hu, linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: On Sun, 2009-09-13 at 14:33 -0400, Eric Paris wrote: > 2a38a002fbee06556489091c30b04746222167e4 is first bad commit > commit 2a38a002fbee06556489091c30b04746222167e4 > Author: Xiaotian Feng > Date: Wed Jul 22 17:03:57 2009 +0800 > > slub: sysfs_slab_remove should free kmem_cache when debug is enabled > > kmem_cache_destroy use sysfs_slab_remove to release the kmem_cache, > but when CONFIG_SLUB_DEBUG is enabled, sysfs_slab_remove just release > related kobject, the whole kmem_cache is missed to release and cause > a memory leak. > > Acked-by: Christoph Lameer > Signed-off-by: Xiaotian Feng > Signed-off-by: Pekka Enberg > > CONFIG_SLUB_DEBUG=y > CONFIG_SLUB=y > CONFIG_SLUB_DEBUG_ON=y > # CONFIG_SLUB_STATS is not set I also had problems destroying a kmem_cache in a security_initcall() function which had a different backtrace (it's what made me create the module and bisect.) So be sure to let me know what you find so I can be sure that we fix that place as well (I believe that was a kref problem rather than a double free) -Eric -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org