From: Ingo Molnar <mingo@elte.hu>
To: "Michael S. Tsirkin" <mst@mellanox.co.il>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
Roland Dreier <roland.list@gmail.com>,
Tziporet Koren <tziporet@mellanox.co.il>,
Roland Dreier <rdreier@cisco.com>,
general@lists.openfabrics.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: lockdep question (was Re: IPoIB caused a kernel: BUG: softlockup detected on CPU#0!)
Date: Sun, 11 Mar 2007 19:48:19 +0100 [thread overview]
Message-ID: <20070311184819.GA2567@elte.hu> (raw)
In-Reply-To: <20070311161231.GC13817@mellanox.co.il>
* Michael S. Tsirkin <mst@mellanox.co.il> wrote:
> > So either there are other sites that instanciate those objects and
> > forget about the lock init, or the object is corrupted (use after free?)
>
> OK, thanks for the hint. So I added this:
> And sure enough it triggers:
>
> [ 858.503010] ipoib_neigh_destructor lock c0687880 wrong type 772 !!!!!!!!!!
could you turn on CONFIG_SLAB_DEBUG as well?
that should catch certain types of use-after-free accesses, and lockdep
will also warn if a still locked object is freed.
Ingo
next prev parent reply other threads:[~2007-03-11 18:49 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <45E552FC.4040305@mellanox.co.il>
[not found] ` <f8ca0a150703030937u61bcd9aj200415b76c00d151@mail.gmail.com>
2007-03-11 13:50 ` lockdep question (was Re: IPoIB caused a kernel: BUG: soft lockup detected on CPU#0!) Michael S. Tsirkin
2007-03-11 15:04 ` Michael S. Tsirkin
2007-03-11 15:22 ` Michael S. Tsirkin
2007-03-11 19:19 ` Ingo Molnar
2007-03-11 15:25 ` Peter Zijlstra
2007-03-11 16:12 ` lockdep question (was Re: IPoIB caused a kernel: BUG: softlockup " Michael S. Tsirkin
2007-03-11 18:48 ` Ingo Molnar [this message]
2007-03-12 13:29 ` Michael S. Tsirkin
2007-03-12 13:51 ` Ingo Molnar
2007-03-12 14:20 ` Michael S. Tsirkin
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