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

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Message-ID: <20070312135112.GA18158@elte.hu>
Date:	Mon, 12 Mar 2007 14:51:12 +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:

> > 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.
> 
> Hmm, no, this does not look like use-after-free. I enabled 
> CONFIG_SLAB_DEBUG, and I still see the same message, so the memory was 
> not overwritten by slab debugger.

that's still not conclusive - the memory might not have been allocated 
by slab again to detect it. Your magic-number check definitely shows 
some sort of corruption going on, right?

	Ingo
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