From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755529AbcA1Ohl (ORCPT ); Thu, 28 Jan 2016 09:37:41 -0500 Received: from mail.windriver.com ([147.11.1.11]:45636 "EHLO mail.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751635AbcA1Ohj (ORCPT ); Thu, 28 Jan 2016 09:37:39 -0500 Date: Thu, 28 Jan 2016 09:37:23 -0500 From: Paul Gortmaker To: Christian Borntraeger CC: Hillf Danton , "'Andrew Morton'" , "'Nadia Yvette Chambers'" , "'Alexander Viro'" , "'Naoya Horiguchi'" , "'Mike Kravetz'" , "'David Rientjes'" , "'Davidlohr Bueso'" , "'Linux Kernel Mailing List'" Subject: Re: Regression: 4.5-rc1 (bisect: hugetlb: make mm and fs code explicitly non-modular vs CONFIG_TIMER_STATS) Message-ID: <20160128143723.GN8889@windriver.com> References: <56A9DC76.2030502@de.ibm.com> <059e01d159af$e4317390$ac945ab0$@alibaba-inc.com> <56A9E404.7000409@de.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <56A9E404.7000409@de.ibm.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [Re: Regression: 4.5-rc1 (bisect: hugetlb: make mm and fs code explicitly non-modular vs CONFIG_TIMER_STATS)] On 28/01/2016 (Thu 10:48) Christian Borntraeger wrote: > On 01/28/2016 10:40 AM, Hillf Danton wrote: > >> > >> Paul, > >> > >> the commit 3e89e1c5ea842 ("hugetlb: make mm and fs code explicitly non-modular") > >> triggers belows warning/oops, if CONFIG_TIMER_STATS is set. > >> > >> Looking at the patch the only "real" change is the init_call, > >> and indeed > >> --- a/mm/hugetlb.c > >> +++ b/mm/hugetlb.c > >> @@ -2653,7 +2653,7 @@ static int __init hugetlb_init(void) > >> mutex_init(&hugetlb_fault_mutex_table[i]); > >> return 0; > >> } > >> -subsys_initcall(hugetlb_init); > >> +device_initcall(hugetlb_init); > >> > >> /* Should be called on processing a hugepagesz=... option */ > >> void __init hugetlb_add_hstate(unsigned int order) > >> > >> makes the problem go away. > > > > Helps more if a patch is delivered. > > The problem is that the original change was intentional. So I do not not > what the right fix is. Thanks for the report ; let me see if I can work out what TIMER_STATS is doing to cause this sometime today. P. -- > > > > > > thanks > > Hillf > > > >> Not sure yet, what CONFIG_TIMER_STATS changes in terms of kobject, though. > >> > >> > >> > >> > >> [ 0.998607] kobject: '(null)' (0000000000000010): is not initialized, yet kobject_get() is being called. > >> [ 0.998620] ------------[ cut here ]------------ > >> [ 0.998621] WARNING: at lib/kobject.c:597 > >> [ 0.998622] Modules linked in: > >> [ 0.998625] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.5.0-rc1 #174 > >> [ 0.998626] task: 0000000232720000 ti: 000000023270c000 task.ti: 000000023270c000 > >> [ 0.998628] Krnl PSW : 0704c00180000000 000000000058276c (kobject_get+0x6c/0x90) > >> [ 0.998632] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 EA:3 > >> Krnl GPRS: 000000000000006c 0000000232720000 000000000000005c 0000000000000001 > >> [ 0.998635] 0000000000287e04 0000000000000000 0000000000dd99a8 0000000000000000 > >> [ 0.998636] 0000000000d86008 0000000000000000 0000000000000000 0000000000000000 > >> [ 0.998637] 0000000000000010 0000000000000010 0000000000582768 000000023270fbb0 > >> [ 0.998643] Krnl Code: 000000000058275c: c02000267259 larl %%r2,a50c0e > >> 0000000000582762: c0e5ffe82b17 brasl %%r14,287d90 > >> #0000000000582768: a7f40001 brc 15,58276a > >> >000000000058276c: a7f4ffe2 brc 15,582730 > >> 0000000000582770: c010003d24f3 larl %%r1,d27156 > >> 0000000000582776: 95001000 cli 0(%%r1),0 > >> 000000000058277a: a774ffe6 brc 7,582746 > >> 000000000058277e: a7f40001 brc 15,582780 > >> [ 0.998653] Call Trace: > >> [ 0.998655] ([<0000000000582768>] kobject_get+0x68/0x90) > >> [ 0.998657] [<000000000058318e>] kobject_add_internal+0x46/0x2e8 > >> [ 0.998658] [<0000000000583684>] kobject_add+0x7c/0xd0 > >> [ 0.998660] [<0000000000583722>] kobject_create_and_add+0x4a/0x98 > >> [ 0.998662] [<00000000002e8ee0>] hugetlb_register_node+0x68/0x130 > >> [ 0.998663] [<0000000000d59ef0>] hugetlb_init+0x4f0/0x600 > >> [ 0.998665] [<00000000001001da>] do_one_initcall+0xa2/0x1b8 > >> [ 0.998666] [<0000000000d3ae52>] kernel_init_freeable+0x232/0x2e0 > >> [ 0.998668] [<00000000008312d2>] kernel_init+0x2a/0x120 > >> [ 0.998670] [<000000000083d332>] kernel_thread_starter+0x6/0xc > >> [ 0.998671] [<000000000083d32c>] kernel_thread_starter+0x0/0xc > >> [ 0.998673] no locks held by swapper/0/1. > >> [ 0.998673] Last Breaking-Event-Address: > >> [ 0.998675] [<0000000000582768>] kobject_get+0x68/0x90 > >> [ 0.998678] ---[ end trace cae7490da7950580 ]--- > >> [ 0.998679] Unable to handle kernel pointer dereference in virtual kernel address space > >> [ 0.998681] failing address: 0000000000000000 TEID: 0000000000000483 > >> [ 0.998681] Fault in home space mode while using kernel ASCE. > >> [ 0.998684] AS:0000000000fb1007 R3:000000023ffcf007 S:000000023fff8000 P:000000000000003d > >> [ 0.998719] Oops: 0004 ilc:3 [#1] SMP DEBUG_PAGEALLOC > >> [ 0.998721] Modules linked in: > >> [ 0.998723] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 4.5.0-rc1 #174 > >> [ 0.998725] task: 0000000232720000 ti: 000000023270c000 task.ti: 000000023270c000 > >> [ 0.998726] Krnl PSW : 0704c00180000000 0000000000582734 (kobject_get+0x34/0x90) > >> [ 0.998729] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 EA:3 > >> Krnl GPRS: 000000000000006c 0000000200000001 000000000000005c 0000000000000001 > >> [ 0.998731] 0000000000287e04 0000000000000000 0000000000dd99a8 0000000000000000 > >> [ 0.998733] 0000000000d86008 0000000000000000 0000000000000000 0000000000000000 > >> [ 0.998734] 0000000000000010 0000000000000010 0000000000582768 000000023270fbb0 > >> [ 0.998739] Krnl Code: 0000000000582728: 9180203c tm 60(%%r2),128 > >> 000000000058272c: a7840013 brc 8,582752 > >> #0000000000582730: a7180001 lhi %%r1,1 > >> >0000000000582734: eb11d03800f8 laa %%r1,%%r1,56(%%r13) > >> 000000000058273a: 07e0 bcr 14,%%r0 > >> 000000000058273c: a71a0001 ahi %%r1,1 > >> 0000000000582740: ec1c0018017e cij %%r1,1,12,582770 > >> 0000000000582746: b904002d lgr %%r2,%%r13 > >> [ 0.998839] Call Trace: > >> [ 0.998841] ([<0000000000582768>] kobject_get+0x68/0x90) > >> [ 0.998843] [<000000000058318e>] kobject_add_internal+0x46/0x2e8 > >> [ 0.998844] [<0000000000583684>] kobject_add+0x7c/0xd0 > >> [ 0.998846] [<0000000000583722>] kobject_create_and_add+0x4a/0x98 > >> [ 0.998847] [<00000000002e8ee0>] hugetlb_register_node+0x68/0x130 > >> [ 0.998849] [<0000000000d59ef0>] hugetlb_init+0x4f0/0x600 > >> [ 0.998850] [<00000000001001da>] do_one_initcall+0xa2/0x1b8 > >> [ 0.998852] [<0000000000d3ae52>] kernel_init_freeable+0x232/0x2e0 > >> [ 0.998853] [<00000000008312d2>] kernel_init+0x2a/0x120 > >> [ 0.998855] [<000000000083d332>] kernel_thread_starter+0x6/0xc > >> [ 0.998856] [<000000000083d32c>] kernel_thread_starter+0x0/0xc > >> [ 0.998857] INFO: lockdep is turned off. > >> [ 0.998858] Last Breaking-Event-Address: > >> [ 0.998859] [<000000000058276c>] kobject_get+0x6c/0x90 > >> [ 0.998861] > >> [ 0.998863] Kernel panic - not syncing: Fatal exception: panic_on_oops > > >