Re: kernel meltdown

From: Kasper Dupont (kasperd@daimi.au.dk)
Date: Fri Jun 07 2002 - 17:11:21 EST

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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 på usenet.
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Next message: Adam J. Richter: "Re: Patch??: linux-2.5.20/fs/bio.c - ll_rw_kio could generate bio's bigger than queue could handle"
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In reply to: Anna Riley: "kernel meltdown"
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