linux-kernel - Re: slab: odd BUG on kzalloc

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Message-ID: <5123C558.5080909@oracle.com>
Date:	Tue, 19 Feb 2013 13:32:56 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Dave Jones <davej@...hat.com>, Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>, mpm@...enic.com,
	linux-mm <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: slab: odd BUG on kzalloc

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

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