linux-kernel - Re: [3.10] Oopses in kmem_cache_allocate() via prepare

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Date:	Sat, 30 Nov 2013 13:08:52 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Simon Kirby <sim@...tway.ca>
Cc:	Ian Applegate <ia@...udflare.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Christoph Lameter <cl@...two.org>,
	Pekka Enberg <penberg@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Chris Mason <chris.mason@...ionio.com>
Subject: Re: [3.10] Oopses in kmem_cache_allocate() via prepare_creds()

On Sat, Nov 30, 2013 at 1:43 AM, Simon Kirby <sim@...tway.ca> wrote:
>
> I turned on kmalloc-192 tracing to find what else is using it: struct
> nfs_fh, struct bio, and struct cred. Poking around those, struct bio has
> bi_cnt, but it is way down in the struct. struct cred has "usage", but it
> comes first.

You could also try to avoid the whole aliasing by using a separate
slab for just the pipe_inode_info.

Something like the attached patch (which also enables debugging just
for that slab).

I still don't see what could be wrong with the pipe_inode_info thing,
but the fact that it's been so consistent in your traces does make me
suspect it really is *that* particular slab. But I dunno, and this
would just confirm it.

                Linus

View attachment "patch.diff" of type "text/plain" (1901 bytes)