Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754256AbaJ1OcK (ORCPT ); Tue, 28 Oct 2014 10:32:10 -0400 Received: from mailapp01.imgtec.com ([195.59.15.196]:20361 "EHLO mailapp01.imgtec.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752994AbaJ1OcI (ORCPT ); Tue, 28 Oct 2014 10:32:08 -0400 Message-ID: <544FA8E2.3050404@imgtec.com> Date: Tue, 28 Oct 2014 14:32:02 +0000 From: Markos Chandras User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 MIME-Version: 1.0 To: Joonsoo Kim CC: Joonsoo Kim , Christoph Lameter , Pekka Enberg , David Rientjes , Andrew Morton , LKML , Subject: Re: Boot problems on Malta with EVA (bisected to 12220dea07f1 "mm/slab: support slab merge") References: <544F73CD.1010409@imgtec.com> <544F97D4.4030408@imgtec.com> <544F991E.3070500@imgtec.com> In-Reply-To: Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Originating-IP: [192.168.154.149] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/28/2014 02:21 PM, Joonsoo Kim wrote: > 2014-10-28 22:48 GMT+09:00 Joonsoo Kim : >> 2014-10-28 22:24 GMT+09:00 Markos Chandras : >>> On 10/28/2014 01:19 PM, Markos Chandras wrote: >>>> On 10/28/2014 01:01 PM, Joonsoo Kim wrote: >>>>> 2014-10-28 19:45 GMT+09:00 Markos Chandras : >>>>>> Hi, >>>>>> >>>>>> It seems I am unable to boot my Malta with EVA. The problem appeared in >>>>>> the 3.18 merge window. I bisected the problem (between v3.17 and >>>>>> v3.18-rc1) and I found the following commit responsible for the broken boot. >>>>> >>>>> Hello, >>>>> >>>>> Did you start to bisect from v3.18-rc1? >>>>> I'd like to be sure that this is another bug which is fixed by following commit. >>>>> >>>>> commit 85c9f4b04a08f6bc770b77530c22d04103468b8f >>>>> Author: Joonsoo Kim >>>>> Date: Mon Oct 13 15:51:01 2014 -0700 >>>>> >>>>> mm/slab: fix unaligned access on sparc64 >>>>> >>>>> This fix is merged into v3.18-rc1 sometime later that >>>>> 'support slab merge' is merged. >>>>> >>>>> Thanks. >>>>> >>>> Hi, >>>> >>>> I bisected from v3.17 until 3.18-rc1. But 3.18-rc2 and the latest >>>> mainline (f7e87a44ef60ad379e39b45437604141453bf0ec) still have the same >>>> problem >>>> >>>> btw i did more tests and this is not EVA specific. A maltaup_defconfig >>>> fails in the same way. I suspect all malta*_defconfigs will fail in a >>>> similar way which makes it probably easier for you to reproduce it on a >>>> QEMU. >>>> >>> >>> sorry maltaup_defconfig does not fail. maltasmvp_defconfig does. So it >>> might be a similar problem like the one fixed in >>> 85c9f4b04a08f6bc770b77530c22d04103468b8f >> >> Oops. Sorry. Above commit ('mm/slab: fix unaligned access on sparc64') >> is irrelevant to this problem. >> >> Anyway, your problem would be related to merging with incompatible slab cache. >> Best way to debug is printing source/target slab cache's object size and >> alignment and find the problem. I will try to reproduce it using QEMU. > > I found that cross compile for MIPS isn't easy job. :) You could grab the following toolchain https://sourcery.mentor.com/GNUToolchain/release2791 (get the IA32 linux tar) unpack it somewhere (eg /tmp) and then make ARCH=mips maltasmvp_defconfig make ARCH=mips CROSS_COMPILE=/tmp/mips-2014.05/bin/mips-linux-gnu- -j8 or something :) > Could you help me to debug the problem with below patch? (there are a few build warnings with your patch mm/slab.c:2065:4: warning: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'size_t' [-Wformat=] mm/slab.c:2065:4: warning: format '%lu' expects argument of type 'long unsigned int', but argument 7 has type 'unsigned int' [-Wformat=] mm/slab.c:2065:4: warning: format '%lu' expects argument of type 'long unsigned int', but argument 8 has type 'int' [-Wformat=] mm/slab.c:2065:4: warning: format '%lu' expects argument of type 'long unsigned int', but argument 9 has type 'int' [-Wformat=] ) but here is the output from a QEMU boot right before the crash CPU frequency 200.00 MHz Calibrating delay loop... 1087.89 BogoMIPS (lpj=5439488) pid_max: default: 32768 minimum: 301 __kmem_cache_alias: (cred_jar 92 0) to (kmalloc-128 128 128 128) __kmem_cache_alias: (files_cache 256 0) to (kmalloc-256 256 128 256) __kmem_cache_alias: (fs_cache 36 0) to (pid 64 64 44) __kmem_cache_alias: (names_cache 4096 0) to (kmalloc-4096 4096 128 4096) __kmem_cache_alias: (mnt_cache 160 0) to (filp 192 64 160) Mount-cache hash table entries: 4096 (order: 0, 16384 bytes) Mountpoint-cache hash table entries: 4096 (order: 0, 16384 bytes) __kmem_cache_alias: (pool_workqueue 256 256) to (kmalloc-256 256 128 256) Kernel bug detected[#1]: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.18.0-rc2-00043-gf7e87a44ef60-dirty #1647 task: 8704b5d8 ti: 8704c000 task.ti: 8704c000 -- markos -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/