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Violators will be prosecuted for from ; Wed, 22 Jun 2016 15:09:04 -0400 Received: from b01cxnp22033.gho.pok.ibm.com (b01cxnp22033.gho.pok.ibm.com [9.57.198.23]) by d01dlp02.pok.ibm.com (Postfix) with ESMTP id F06536E8045 for ; Wed, 22 Jun 2016 15:08:37 -0400 (EDT) Received: from d01av01.pok.ibm.com (d01av01.pok.ibm.com [9.56.224.215]) by b01cxnp22033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u5MJ8t2i48300174 for ; Wed, 22 Jun 2016 19:08:55 GMT Received: from d01av01.pok.ibm.com (localhost [127.0.0.1]) by d01av01.pok.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u5MJ8tI6021130 for ; Wed, 22 Jun 2016 15:08:55 -0400 Date: Wed, 22 Jun 2016 12:08:59 -0700 From: "Paul E. McKenney" Subject: Re: Boot failure on emev2/kzm9d (was: Re: [PATCH v2 11/11] mm/slab: lockless decision to grow cache) Reply-To: paulmck@linux.vnet.ibm.com References: <20160614081125.GA17700@js1304-P5Q-DELUXE> <20160615022325.GA19863@js1304-P5Q-DELUXE> <20160620063942.GA13747@js1304-P5Q-DELUXE> <20160620131254.GO3923@linux.vnet.ibm.com> <20160621064302.GA20635@js1304-P5Q-DELUXE> <20160621125406.GF3923@linux.vnet.ibm.com> <20160622005208.GB25106@js1304-P5Q-DELUXE> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Message-Id: <20160622190859.GA1473@linux.vnet.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: Geert Uytterhoeven Cc: Joonsoo Kim , Andrew Morton , Christoph Lameter , Pekka Enberg , David Rientjes , Jesper Dangaard Brouer , Linux MM , "linux-kernel@vger.kernel.org" , linux-renesas-soc@vger.kernel.org, "linux-arm-kernel@lists.infradead.org" On Wed, Jun 22, 2016 at 05:01:35PM +0200, Geert Uytterhoeven wrote: > On Wed, Jun 22, 2016 at 2:52 AM, Joonsoo Kim wrote: > > Could you try below patch to check who causes the hang? > > > > And, if sysalt-t works when hang, could you get sysalt-t output? I haven't > > used it before but Paul could find some culprit on it. :) > > > > Thanks. > > > > > > ----->8----- > > diff --git a/mm/slab.c b/mm/slab.c > > index 763096a..9652d38 100644 > > --- a/mm/slab.c > > +++ b/mm/slab.c > > @@ -964,8 +964,13 @@ static int setup_kmem_cache_node(struct kmem_cache *cachep, > > * guaranteed to be valid until irq is re-enabled, because it will be > > * freed after synchronize_sched(). > > */ > > - if (force_change) > > + if (force_change) { > > + if (num_online_cpus() > 1) > > + dump_stack(); > > synchronize_sched(); > > + if (num_online_cpus() > 1) > > + dump_stack(); > > + } > > I've only added the first one, as I would never see the second one. All of > this happens before the serial console is activated, earlycon is not supported, > and I only have remote access. > > Brought up 2 CPUs > SMP: Total of 2 processors activated (2132.00 BogoMIPS). > CPU: All CPU(s) started in SVC mode. > CPU: 0 PID: 1 Comm: swapper/0 Not tainted > 4.7.0-rc4-kzm9d-00404-g4a235e6dde4404dd-dirty #89 > Hardware name: Generic Emma Mobile EV2 (Flattened Device Tree) > [] (unwind_backtrace) from [] (show_stack+0x10/0x14) > [] (show_stack) from [] (dump_stack+0x7c/0x9c) > [] (dump_stack) from [] (setup_kmem_cache_node+0x140/0x170) > [] (setup_kmem_cache_node) from [] > (__do_tune_cpucache+0xf4/0x114) > [] (__do_tune_cpucache) from [] (enable_cpucache+0xf8/0x148) > [] (enable_cpucache) from [] > (__kmem_cache_create+0x1a8/0x1d0) > [] (__kmem_cache_create) from [] > (kmem_cache_create+0xbc/0x190) > [] (kmem_cache_create) from [] (shmem_init+0x34/0xb0) > [] (shmem_init) from [] (kernel_init_freeable+0x98/0x1ec) > [] (kernel_init_freeable) from [] (kernel_init+0x8/0x110) > [] (kernel_init) from [] (ret_from_fork+0x14/0x3c) > devtmpfs: initialized I don't see anything here that would prevent grace periods from completing. The CPUs are using the normal hotplug sequence to come online, correct? Thanx, Paul -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org