linux-kernel - Re: [slub] WARNING: CPU: 0 PID: 0 at mm/slub.c:1511 __kmem_cache

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Message-ID: <52D5746F.2040604@intel.com>
Date:	Tue, 14 Jan 2014 09:31:27 -0800
From:	Dave Hansen <dave.hansen@...el.com>
To:	Fengguang Wu <fengguang.wu@...el.com>,
	Peter Zijlstra <peterz@...radead.org>
CC:	Pekka Enberg <penberg@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [slub] WARNING: CPU: 0 PID: 0 at mm/slub.c:1511 __kmem_cache_create()

> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/?id=c65c1877bd6826ce0d9713d76e30a7bed8e49f38

I think the assert is just bogus at least in the early case.
early_kmem_cache_node_alloc() says:
 * No kmalloc_node yet so do it by hand. We know that this is the first
 * slab on the node for this slabcache. There are no concurrent accesses
 * possible.

Should we do something like the attached patch?  (very lightly tested)

View attachment "slub-lockdep-workaround.patch" of type "text/x-patch" (654 bytes)