From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933968AbcKJOzc (ORCPT ); Thu, 10 Nov 2016 09:55:32 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:56890 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S933859AbcKJOzR (ORCPT ); Thu, 10 Nov 2016 09:55:17 -0500 Date: Thu, 10 Nov 2016 06:54:56 -0800 From: "Paul E. McKenney" To: Sergey Senozhatsky Cc: Josh Triplett , Steven Rostedt , Mathieu Desnoyers , Andy Lutomirski , linux-kernel@vger.kernel.org, linux-next@vger.kernel.org, Sergey Senozhatsky Subject: Re: [linux-next] RCU: dyntick_idle warnings Reply-To: paulmck@linux.vnet.ibm.com References: <20161110075719.GA502@swordfish> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20161110075719.GA502@swordfish> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-GCONF: 00 X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16111014-0024-0000-0000-000014FED9C9 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00006052; HX=3.00000240; KW=3.00000007; PH=3.00000004; SC=3.00000189; SDB=6.00779115; UDB=6.00375336; IPR=6.00556476; BA=6.00004868; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00013284; XFM=3.00000011; UTC=2016-11-10 14:54:59 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16111014-0025-0000-0000-00004608D267 Message-Id: <20161110145456.GA4127@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-11-10_07:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1609300000 definitions=main-1611100270 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Nov 10, 2016 at 04:57:19PM +0900, Sergey Senozhatsky wrote: > Hello Paul, > > x86_64, linux-next 20161110 > > WARN_ON_ONCE(!(special & RCU_DYNTICK_CTRL_CTR)); > > [ 0.436242] ------------[ cut here ]------------ > [ 0.436307] WARNING: CPU: 3 PID: 0 at kernel/rcu/tree.c:380 rcu_momentary_dyntick_idle+0xa7/0xb8 > [ 0.436381] Modules linked in: > [ 0.436437] CPU: 3 PID: 0 Comm: swapper/3 Not tainted 4.9.0-rc4-next-20161110-dbg-00001-g0d7df5d-dirty #863 > [ 0.436513] Hardware name: SAMSUNG ELECTRONICS CO.,LTD Samsung DeskTop System/Samsung DeskTop System, BIOS 05CC 04/09/2010 > [ 0.436595] Call Trace: > [ 0.436651] dump_stack+0x4d/0x63 > [ 0.436706] __warn+0xb8/0xd3 > [ 0.436760] warn_slowpath_null+0x18/0x1a > [ 0.436815] rcu_momentary_dyntick_idle+0xa7/0xb8 > [ 0.436872] rcu_note_context_switch+0x2c8/0x2d5 > [ 0.436930] __schedule+0x62/0x3b6 > [ 0.436984] schedule+0x84/0x95 > [ 0.437038] schedule_preempt_disabled+0x10/0x19 > [ 0.437095] cpu_startup_entry+0x18c/0x191 > [ 0.437152] start_secondary+0xef/0xf2 > [ 0.437207] start_cpu+0x5/0x14 > [ 0.437263] ---[ end trace c0bbb435a1f86b8a ]--- > > > > WARN_ON_ONCE(!(atomic_read(&rdtp->dynticks) & 0x1)); > > [ 0.895911] ------------[ cut here ]------------ > [ 0.895966] WARNING: CPU: 0 PID: 1 at kernel/rcu/tree.c:1116 rcu_nmi_exit+0x63/0x82 > [ 0.896026] Modules linked in:^Ac > [ 0.896078] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 4.9.0-rc4-next-20161110-dbg-00001-g0d7df5d-dirty #863 > [ 0.896157] Hardware name: SAMSUNG ELECTRONICS CO.,LTD Samsung DeskTop System/Samsung DeskTop System, BIOS 05CC 04/09/2010 > [ 0.896236] Call Trace: > [ 0.896287] > [ 0.896338] dump_stack+0x4d/0x63 > [ 0.896390] __warn+0xb8/0xd3 > [ 0.896442] warn_slowpath_null+0x18/0x1a > [ 0.896495] rcu_nmi_exit+0x63/0x82 > [ 0.896548] do_nmi+0x2b4/0x31f > [ 0.896600] end_repeat_nmi+0x1a/0x1e > [ 0.896652] RIP: 0010:ioread32+0xb/0x2f > [ 0.896705] RSP: 0000:ffffc900000176c0 EFLAGS: 00000296^Ac > [ 0.896762] RAX: 0000000000000004 RBX: ffff880132868a80 RCX: 0000000000000000 > [ 0.896820] RDX: 0000000000000003 RSI: ffffc9000100e180 RDI: ffffc9000100e180 > [ 0.896879] RBP: ffffc900000176c8 R08: 000000000000000a R09: 000000000000b885 > [ 0.896938] R10: ffffc900000178e8 R11: ffff8801330b0080 R12: 00000000fffb6f2e > [ 0.896996] R13: 0000000000000006 R14: 000000000000005b R15: ffff88013288f848 > [ 0.897055] ? ioread32+0xb/0x2f > [ 0.897107] ? ioread32+0xb/0x2f > [ 0.897160] > [ 0.897210] ? nv50_i2c_bus_sense_scl+0x1f/0x24 > [ 0.897265] nvkm_i2c_bus_getscl+0xa/0xc > [ 0.897318] sclhi+0x36/0x6a > [ 0.897369] i2c_outb+0x49/0xcf > [ 0.897422] try_address+0x30/0x6f > [ 0.897475] bit_xfer+0x23a/0x402 > [ 0.897527] __i2c_transfer+0x156/0x18b > [ 0.897581] i2c_transfer+0x6e/0x8c > [ 0.897634] ? nvkm_fantog_create+0xcd/0xcd > [ 0.897688] nvkm_i2c_bus_probe+0x141/0x200 > [ 0.897741] ? extdev_table+0xa7/0xc6 > [ 0.897793] nvkm_therm_ic_ctor+0x141/0x14f > [ 0.897847] ? nvkm_therm_ic_ctor+0x141/0x14f > [ 0.897900] ? nvbios_rd08+0x1a/0x30 > [ 0.897953] ? nvbios_therm_sensor_parse+0x97/0x1ca > [ 0.898008] nvkm_therm_oneinit+0x19/0x3b > [ 0.898061] nvkm_subdev_init+0x89/0x195 > [ 0.898114] nvkm_device_init+0x145/0x204 > [ 0.898167] nvkm_udevice_init+0x2f/0x4a > [ 0.898220] nvkm_object_init+0x71/0x15d > [ 0.898273] nvkm_ioctl_new+0x1aa/0x27a > [ 0.898326] ? nvkm_client_notify+0x22/0x22 > [ 0.898380] ? nvkm_udevice_rd08+0x1f/0x1f > [ 0.898434] nvkm_ioctl+0x174/0x1d0 > [ 0.898487] nvkm_client_ioctl+0xd/0xf > [ 0.898540] nvif_object_ioctl+0x42/0x44 > [ 0.898594] nvif_object_init+0xc4/0x104 > [ 0.898647] nvif_device_init+0xd/0x2b > [ 0.898700] nouveau_drm_load+0x269/0x89e > [ 0.898753] drm_dev_register+0x7f/0xc0 > [ 0.898806] drm_get_pci_dev+0xf3/0x1bd > [ 0.898860] nouveau_drm_probe+0x1a2/0x1c1 > [ 0.898913] pci_device_probe+0x7e/0xe6 > [ 0.898966] driver_probe_device+0x130/0x284 > [ 0.899020] __driver_attach+0x6a/0x8c > [ 0.899074] ? driver_probe_device+0x284/0x284 > [ 0.899128] bus_for_each_dev+0x68/0x80 > [ 0.899181] driver_attach+0x19/0x1b > [ 0.899234] bus_add_driver+0xe9/0x1d9 > [ 0.899287] driver_register+0x83/0xba > [ 0.899340] ? ttm_init+0x5d/0x5d > [ 0.899393] __pci_register_driver+0x47/0x49 > [ 0.899446] drm_pci_init+0x47/0xc8 > [ 0.899500] ? ttm_init+0x5d/0x5d > [ 0.899552] ? set_debug_rodata+0x12/0x12 > [ 0.899605] nouveau_drm_init+0x1db/0x1dd > [ 0.899658] do_one_initcall+0x8b/0x10e > [ 0.899711] ? set_debug_rodata+0x12/0x12 > [ 0.899765] kernel_init_freeable+0x123/0x1ab > [ 0.899819] ? rest_init+0x7d/0x7d > [ 0.899871] kernel_init+0x9/0xeb > [ 0.899924] ret_from_fork+0x22/0x30 > [ 0.899977] ---[ end trace c0bbb435a1f86b8b ]--- Hello, Sergey, Should be fixed by 0ea13930e9a8 ("rcu: Maintain special bits at bottom of ->dynticks counter"), which should be in -next today. And thank you for your testing efforts! Thanx, Paul