From: Christoph Lameter <cl@gentwo.org>
To: Joe Lawrence <joe.lawrence@stratus.com>
Cc: linux-kernel@vger.kernel.org, Tejun Heo <tj@kernel.org>,
Vivek Goyal <vgoyal@redhat.com>
Subject: Re: docker crashes rcuos in __blkg_release_rcu
Date: Tue, 10 Jun 2014 14:52:15 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.10.1406101449150.18982@gentwo.org> (raw)
In-Reply-To: <alpine.DEB.2.02.1406081816540.17948@jlaw-desktop.mno.stratus.com>
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).
prev parent reply other threads:[~2014-06-10 20:09 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-08 22:22 Joe Lawrence
2014-06-09 17:47 ` Vivek Goyal
2014-06-09 18:27 ` Vivek Goyal
2014-06-10 18:39 ` Joe Lawrence
2014-06-10 19:14 ` Vivek Goyal
2014-06-11 16:32 ` Vivek Goyal
2014-06-19 20:26 ` Tejun Heo
2014-06-19 21:42 ` [PATCH block/for-linus] blkcg: fix use-after-free in __blkg_release_rcu() by making blkcg_gq refcnt an atomic_t Tejun Heo
2014-06-20 14:39 ` Vivek Goyal
2014-06-20 18:50 ` Jens Axboe
2014-06-20 18:50 ` Joe Lawrence
2014-06-10 19:52 ` Christoph Lameter [this message]
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