linux-kernel - Re: lockdep question (was Re: IPoIB caused a kernel: BUG: softlockup detected on CPU#0!)

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Date:	Sun, 11 Mar 2007 19:48:19 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Michael S. Tsirkin" <mst@...lanox.co.il>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Roland Dreier <roland.list@...il.com>,
	Tziporet Koren <tziporet@...lanox.co.il>,
	Roland Dreier <rdreier@...co.com>,
	general@...ts.openfabrics.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: lockdep question (was Re: IPoIB caused a kernel: BUG: softlockup detected on CPU#0!)


* Michael S. Tsirkin <mst@...lanox.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
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