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Date: Thu, 19 Jun 2014 10:03:04 -0500 (CDT)
From: Christoph Lameter <cl@gentwo.org>
Subject: Re: slub/debugobjects: lockup when freeing memory
In-Reply-To: <53A2F406.4010109@oracle.com>
Message-ID: <alpine.DEB.2.11.1406191001090.2785@gentwo.org>
References: <53A2F406.4010109@oracle.com>
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Sender: owner-linux-mm@kvack.org
List-ID: <linux-mm.kvack.org>
To: Sasha Levin <sasha.levin@oracle.com>
Cc: Pekka Enberg <penberg@kernel.org>, Thomas Gleixner <tglx@linutronix.de>, Matt Mackall <mpm@selenic.com>, Andrew Morton <akpm@linux-foundation.org>, Dave Jones <davej@redhat.com>, "linux-mm@kvack.org" <linux-mm@kvack.org>, "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>Dave Jones <davej@redhat.com>, LKML <linux-kernel@vger.kernel.org>

On Thu, 19 Jun 2014, Sasha Levin wrote:

> [  690.770137] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63)
> [  690.770137] __slab_alloc (mm/slub.c:1732 mm/slub.c:2205 mm/slub.c:2369)
> [  690.770137] ? __lock_acquire (kernel/locking/lockdep.c:3189)
> [  690.770137] ? __debug_object_init (lib/debugobjects.c:100 lib/debugobjects.c:312)
> [  690.770137] kmem_cache_alloc (mm/slub.c:2442 mm/slub.c:2484 mm/slub.c:2489)
> [  690.770137] ? __debug_object_init (lib/debugobjects.c:100 lib/debugobjects.c:312)
> [  690.770137] ? debug_object_activate (lib/debugobjects.c:439)
> [  690.770137] __debug_object_init (lib/debugobjects.c:100 lib/debugobjects.c:312)
> [  690.770137] debug_object_init (lib/debugobjects.c:365)
> [  690.770137] rcuhead_fixup_activate (kernel/rcu/update.c:231)
> [  690.770137] debug_object_activate (lib/debugobjects.c:280 lib/debugobjects.c:439)
> [  690.770137] ? discard_slab (mm/slub.c:1486)
> [  690.770137] __call_rcu (kernel/rcu/rcu.h:76 (discriminator 2) kernel/rcu/tree.c:2585 (discriminator 2))

__call_rcu does a slab allocation? This means __call_rcu can no longer be
used in slab allocators? What happened?

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