linux-kernel - Re: docker crashes rcuos in __blkg_release

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Date:	Tue, 10 Jun 2014 14:52:15 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	Joe Lawrence <joe.lawrence@...atus.com>
cc:	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: docker crashes rcuos in __blkg_release_rcu

On Sun, 8 Jun 2014, Joe Lawrence wrote:

>
> .tickets is offset 0 from arch_spinlock_t, so RDI should be the
> arch_spinlock_t lock:
> RDI: 6b6b6b6b6b6b6b6b

Slub has overwritten the object when it was freed with 0x6b.
So this is an access after free.

It works without debug because the object may still linger around (but
there is no guarantee that the memory has not been reused).

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