From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail6.bemta8.messagelabs.com (mail6.bemta8.messagelabs.com [216.82.243.55]) by kanga.kvack.org (Postfix) with ESMTP id 4A61A6B004A for ; Wed, 20 Jul 2011 04:30:44 -0400 (EDT) Date: Wed, 20 Jul 2011 09:30:36 +0100 From: Catalin Marinas Subject: Re: kmemleak fails to report detected leaks after allocation failure Message-ID: <20110720083036.GG28726@e102109-lin.cambridge.arm.com> References: <20110719211438.GA21588@elliptictech.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20110719211438.GA21588@elliptictech.com> Sender: owner-linux-mm@kvack.org List-ID: To: Nick Bowler Cc: "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" On Tue, Jul 19, 2011 at 10:14:38PM +0100, Nick Bowler wrote: > I just ran into a somewhat amusing issue with kmemleak. After running > for a while (10 days), and detecting about 100 "suspected memory leaks", > kmemleak ultimately reported: > > kmemleak: Cannot allocate a kmemleak_object structure > kmemleak: Automatic memory scanning thread ended > kmemleak: Kernel memory leak detector disabled > > OK, so something failed and kmemleak apparently can't recover from > this. However, at this point, it appears that kmemleak has *also* > lost the ability to report the earlier leaks that it actually > detected. > > cat: /sys/kernel/debug/kmemleak: Device or resource busy > > It seems to me that kmemleak shouldn't lose the ability to report leaks > that it already detected after it disables itself due to an issue that > was potentially caused by the very leaks that it managed to detect > (unlikely in this instance, but still...). Very good point, I haven't thought of this. I'll try to improve this part. Thanks. -- Catalin -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org