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Date: Sat, 08 Jun 2002 00:11:21 +0200
From: Kasper Dupont <kasperd@daimi.au.dk>
Organization: daimi.au.dk
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To: Anna Riley <ariley@ignitesports.com>
CC: linux-kernel@vger.kernel.org
Subject: Re: kernel meltdown
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Anna Riley wrote:
> 
> Hi there,
> I am hoping someone can help me. This morning one of our web servers
> crapped itself and I don't know why. It's running RedHat 7.2 kernel
> version 2.4.9-31smp. I couldn't login from the console so I had to
> reset it. When it came back up it was fine. This is what I am seeing
> in the messages log: 
> 
> Jun 7 02:57:43 web02 kernel: kernel BUG at slab.c:1767!

I looked up that line in the source and found this piece of code:

		full_free = 0;
		p = searchp->slabs_free.next;
		while (p != &searchp->slabs_free) {
			slabp = list_entry(p, slab_t, list);
			if (slabp->inuse)
				BUG();
			full_free++;
			p = p->next;
		}

Could it be a race with this particular slabp being taken in use
by another CPU at this very moment?

-- 
Kasper Dupont -- der bruger for meget tid p? usenet.
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