Re: [RFC][PATCH] slub: Check for page NULL before doing the node_matchcheck

[Christoph Lameter]

On Thu, 17 Jan 2013, Steven Rostedt wrote:

> Anyway, looking at where this crashed, it seems that the page variable
> can be NULL when passed to the node_match() function (which does not
> check if it is NULL). When this happens we get the above panic.
>
> As page is only used in slab_alloc() to check if the node matches, if
> it's NULL I'm assuming that we can say it doesn't and call the
> __slab_alloc() code. Is this a correct assumption?

c->page should only be NULL when c->freelist == NULL but obviously there
are race conditions where c->freelist may not have been zapped but c->page
was.

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