From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx109.postini.com [74.125.245.109]) by kanga.kvack.org (Postfix) with SMTP id 6894C6B0007 for ; Tue, 19 Feb 2013 13:33:17 -0500 (EST) Message-ID: <5123C558.5080909@oracle.com> Date: Tue, 19 Feb 2013 13:32:56 -0500 From: Sasha Levin MIME-Version: 1.0 Subject: Re: slab: odd BUG on kzalloc References: <5120FDA4.2060704@oracle.com> <0000013cefe056e0-daedd018-43cd-472f-9b20-27b2a897ae2a-000000@email.amazonses.com> <5123C1F1.6050102@oracle.com> <20130219182952.GB27141@redhat.com> In-Reply-To: <20130219182952.GB27141@redhat.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Dave Jones , Christoph Lameter , Pekka Enberg , mpm@selenic.com, linux-mm , "linux-kernel@vger.kernel.org" On 02/19/2013 01:29 PM, Dave Jones wrote: > On Tue, Feb 19, 2013 at 01:18:25PM -0500, Sasha Levin wrote: > > > >> [ 169.930103] ---[ end trace 4d135f3def21b4bd ]--- > > >> > > >> The code translates to the following in fs/pipe.c:alloc_pipe_info : > > >> > > >> pipe = kzalloc(sizeof(struct pipe_inode_info), GFP_KERNEL); > > >> if (pipe) { > > >> pipe->bufs = kzalloc(sizeof(struct pipe_buffer) * PIPE_DEF_BUFFERS, GFP_KERNEL); <=== this > > >> if (pipe->bufs) { > > >> init_waitqueue_head(&pipe->wait); > > > > Looks like it's not specific to pipe(). I've also got this one now: > > > > Since I've managed to reproduce it, I'll go ahead and add slub_debug and see what it tells us. > > I'm curious, did you recently upgrade gcc, or other parts of the toolchain ? > This, and one of the other 'weird' bugs you reported recently have me wondering > if perhaps you're seeing a compiler bug. It happened once on a kernel built on my gentoo box with is generally up to date, but the other time the kernel was built on my mini-server running ubuntu, which isn't updated that often. So I don't think compiler trickery is involved. Thanks, Sasha -- 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