From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-3992186-1523244686-2-13058258493831941104 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.25, MAILING_LIST_MULTI -1, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='US', FromHeader='com', MailFrom='org', XOriginatingCountry='US' X-Spam-charsets: plain='iso-8859-1' X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: stable-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=fm2; t= 1523244686; b=X7isVuJrG5GbDtLvIdID8vVmIzx1bAPyL965ky695f+TOSfpYI +kttfcgxJ32eph/GS2vH7mdHSIiVKSrqcLEQqN9KLrZ/Y5JrKeC8RNjii+a1wMRm UFn0JerNA95AaA0mvKp/bwSQkIB0jc1eeuD0bvJIMTCuCF6rWqWgZ4utE/kJNR64 wUCHnNz61qOoLWIxuwZ2wxPtbaf+p75sy6zd+J3+qSo1bY1jGQHWFR9x/QWaaDQV GvkmgUziI69BJbou5UWV1shDPwWmMj07DzJajP3Kwrhp9CrfgXdwsaXuSHoKTzAT +Kn1aibXfBDBEZPZHF36EpaZ33cHUj2HWpfg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:to:cc:subject:date:message-id :references:in-reply-to:content-type:content-transfer-encoding :mime-version:sender:list-id; s=fm2; t=1523244686; bh=L6FAVFfdLu yoiD+53t6MQiLkPza4klPuHWuTS7sLyBI=; b=qjoC3CTIPul59Q47PeuXCPJbqp G6opNnO66BdU0LWP47oT/ooB81Nl70WethF5W8T0VWMpIr+fGoZ2NZgRlFkRgdp5 YrQHgrzhIXo5izn94JqJKT+KkEXVoKQ8/izWXT3Yk4gQMA8Pv5kzPIH0qcrM+Eal CkidA+s4/FMB590RzallYWffkCTUp5go6xHmADaftb+xX+wp78bzNZwj/Wxv9YZR aPmPSf/dRFJeYb436w1SqZI7ifH2Di6eLn9wIQKaDOUvc/M9CueUeTIxBCy3/jPo uh0IUfuJ1ls4d1y7yXdSglp17HWzn7fPOC6FjFDzf2HcAIZzjl44MihX6bBQ== ARC-Authentication-Results: i=1; mx5.messagingengine.com; arc=none (no signatures found); dkim=pass (1024-bit rsa key sha256) header.d=microsoft.com header.i=@microsoft.com header.b=g+I+6M3w x-bits=1024 x-keytype=rsa x-algorithm=sha256 x-selector=selector1; dmarc=pass (p=reject,has-list-id=yes,d=none) header.from=microsoft.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-cm=none score=0; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=microsoft.com header.result=pass header_is_org_domain=yes; x-vs=clean score=-100 state=0 Authentication-Results: mx5.messagingengine.com; arc=none (no signatures found); dkim=pass (1024-bit rsa key sha256) header.d=microsoft.com header.i=@microsoft.com header.b=g+I+6M3w x-bits=1024 x-keytype=rsa x-algorithm=sha256 x-selector=selector1; dmarc=pass (p=reject,has-list-id=yes,d=none) header.from=microsoft.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-cm=none score=0; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=microsoft.com header.result=pass header_is_org_domain=yes; x-vs=clean score=-100 state=0 X-ME-VSCategory: clean X-CM-Envelope: MS4wfD5+6bBrS00eO55KHmJWpaLJkjL+GWPRCsJnuv/fM4bfLQQ5zlopyXgNFfYr9KF0l8Yc3nc/oDdGhFSST6RcXuZNYSoQURGNDLTsB2WAN7CNy4mW1+Fy nlnOZBV8fWgREFfXjAOXoT8VuR3wezgxUH1Jbds6107YDD4e3Fc/9JsR9DEIu8qNHHZA3i3z768WzvS9Ywki5sJ10rIpD+rc/zZmtRsTWhGyj0G6CizQ4shd X-CM-Analysis: v=2.3 cv=NPP7BXyg c=1 sm=1 tr=0 a=UK1r566ZdBxH71SXbqIOeA==:117 a=UK1r566ZdBxH71SXbqIOeA==:17 a=wRwT6uffUbIA:10 a=t_PdEiP4ckcA:10 a=mw6kJ3eo-EIA:10 a=8nJEP1OIZ-IA:10 a=xqWC_Br6kY4A:10 a=Kd1tUaAdevIA:10 a=Lf-vpJhqX20A:10 a=20KFwNOVAAAA:8 a=7CQSdrXTAAAA:8 a=yMhMjlubAAAA:8 a=-xatWzGfyKS8k81ClTMA:9 a=wPNLvfGTeEIA:10 a=a-qgeE7W1pNrGK8U0ZQC:22 X-ME-CMScore: 0 X-ME-CMCategory: none Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752107AbeDIDbJ (ORCPT ); Sun, 8 Apr 2018 23:31:09 -0400 Received: from mail-sn1nam02on0123.outbound.protection.outlook.com ([104.47.36.123]:35872 "EHLO NAM02-SN1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754539AbeDIAV4 (ORCPT ); Sun, 8 Apr 2018 20:21:56 -0400 From: Sasha Levin To: "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" CC: Mark Salter , Marc Zyngier , Sasha Levin Subject: [PATCH AUTOSEL for 4.15 189/189] irqchip/gic-v3: Change pr_debug message to pr_devel Thread-Topic: [PATCH AUTOSEL for 4.15 189/189] irqchip/gic-v3: Change pr_debug message to pr_devel Thread-Index: AQHTz5hmQGDu72S6K0K7uBH3TTss2w== Date: Mon, 9 Apr 2018 00:19:18 +0000 Message-ID: <20180409001637.162453-189-alexander.levin@microsoft.com> References: <20180409001637.162453-1-alexander.levin@microsoft.com> In-Reply-To: <20180409001637.162453-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB0936;7:bigFZzixCXt1E2rKLHtLQj0qAD+hJiAyQIFtw5v+2fs15UBNIN1+WtAuBpXtMckUV4s3TSSyhIG9iPtORh6xBl/vyiTbr2+DDsy/Q+9rLsK7cEGX9ywCelfgIcusI+v/maO5iEoHFCs5xKgsTQbTNoC5RSj9wO8TJqWMAVpdQ4fjMcD3nYH1oJg3xJUy8hjeM0+lI2bVaxnShMC6KBGp/94lJybGnzkC0Yz4Rwpl3Q6hiJA4xCyRtJybR7MdQu2k;20:0/c7mjxHafrBZwUV1Z+Lk8l0YukzFYFS2XCoe/JOU4IkNI6SrjvMvFXnjvU6wUj+UrYNnVHjjfMw/htbU/PNIW9luUIc8EcllCWPvPkqQ7gbgAEaztngRjBlqzM8cww82tfxE1mqBHW2CQRiNOpOFUiAUxEbq5LpRaIXFPwF6eY= x-ms-office365-filtering-ht: Tenant X-MS-Office365-Filtering-Correlation-Id: 2fa8a0f8-2d8a-451c-2dfe-08d59dafe57b x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB0936; x-ms-traffictypediagnostic: DM5PR2101MB0936: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(28532068793085)(180628864354917)(89211679590171); x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(8211001083)(61425038)(6040522)(2401047)(5005006)(8121501046)(93006095)(93001095)(3231221)(944501327)(52105095)(3002001)(10201501046)(6055026)(61426038)(61427038)(6041310)(20161123560045)(20161123564045)(20161123562045)(20161123558120)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(6072148)(201708071742011);SRVR:DM5PR2101MB0936;BCL:0;PCL:0;RULEID:;SRVR:DM5PR2101MB0936; x-forefront-prvs: 0637FCE711 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(346002)(39380400002)(39860400002)(396003)(376002)(366004)(199004)(189003)(3660700001)(36756003)(2501003)(76176011)(10290500003)(2616005)(5250100002)(3280700002)(478600001)(1076002)(72206003)(6436002)(53936002)(486006)(476003)(4326008)(6486002)(107886003)(5660300001)(54906003)(110136005)(102836004)(2906002)(6116002)(15650500001)(3846002)(86612001)(81156014)(81166006)(6666003)(8936002)(305945005)(8676002)(2900100001)(6506007)(68736007)(14454004)(106356001)(105586002)(25786009)(6512007)(86362001)(99286004)(446003)(59450400001)(10090500001)(11346002)(316002)(26005)(7736002)(66066001)(186003)(22452003)(97736004)(22906009)(217873001);DIR:OUT;SFP:1102;SCL:1;SRVR:DM5PR2101MB0936;H:DM5PR2101MB1032.namprd21.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; x-microsoft-antispam-message-info: sW5fU8fimFDsHxb4B4ROIcwF9/QoNVMEAO3mzKRPGWlKyLnTsOuQDv/2IGvsZL9wb8tIpfT3+sSunyF2m/IZ+M7FlTWqPpV3sYl0UFuba/bkFHxIXQNxpMlD0crVN2GrJuAv2tmlvHr44qdmgewnZ6bGlNwwu/gr/u5vEWFfbjOArrDsBvFyi18GZ+dbVu9s+fO+qWtkDrFjkm5mmYo8ln+v/0Jrh1PUgJtrMFh2+oUXLfI2s/2oGd4O8eziyENhSxng6Mzj+a2CNoa2o80fNHE3npy1VjAbPegtdALaB0gevY15hvHuODLrMsMvOTXtaJYJ2qOLIDu93dvxFu67fu14VaUkbTH4CjPh1EiMXlv4L7B2DEDET37RNs+JEizhspI/EO6e/pf6Lkw0BjKYFBqLv+eKCbPASwl9XCwvs1A= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 2fa8a0f8-2d8a-451c-2dfe-08d59dafe57b X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Apr 2018 00:19:18.7829 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB0936 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Mark Salter [ Upstream commit b6dd4d83dc2f78cebc9a7e6e7e4bc2be4d29b94d ] The pr_debug() in gic-v3 gic_send_sgi() can trigger a circular locking warning: GICv3: CPU10: ICC_SGI1R_EL1 5000400 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D WARNING: possible circular locking dependency detected 4.15.0+ #1 Tainted: G W ------------------------------------------------------ dynamic_debug01/1873 is trying to acquire lock: ((console_sem).lock){-...}, at: [<0000000099c891ec>] down_trylock+0x20/0x= 4c but task is already holding lock: (&rq->lock){-.-.}, at: [<00000000842e1587>] __task_rq_lock+0x54/0xdc which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&rq->lock){-.-.}: __lock_acquire+0x3b4/0x6e0 lock_acquire+0xf4/0x2a8 _raw_spin_lock+0x4c/0x60 task_fork_fair+0x3c/0x148 sched_fork+0x10c/0x214 copy_process.isra.32.part.33+0x4e8/0x14f0 _do_fork+0xe8/0x78c kernel_thread+0x48/0x54 rest_init+0x34/0x2a4 start_kernel+0x45c/0x488 -> #1 (&p->pi_lock){-.-.}: __lock_acquire+0x3b4/0x6e0 lock_acquire+0xf4/0x2a8 _raw_spin_lock_irqsave+0x58/0x70 try_to_wake_up+0x48/0x600 wake_up_process+0x28/0x34 __up.isra.0+0x60/0x6c up+0x60/0x68 __up_console_sem+0x4c/0x7c console_unlock+0x328/0x634 vprintk_emit+0x25c/0x390 dev_vprintk_emit+0xc4/0x1fc dev_printk_emit+0x88/0xa8 __dev_printk+0x58/0x9c _dev_info+0x84/0xa8 usb_new_device+0x100/0x474 hub_port_connect+0x280/0x92c hub_event+0x740/0xa84 process_one_work+0x240/0x70c worker_thread+0x60/0x400 kthread+0x110/0x13c ret_from_fork+0x10/0x18 -> #0 ((console_sem).lock){-...}: validate_chain.isra.34+0x6e4/0xa20 __lock_acquire+0x3b4/0x6e0 lock_acquire+0xf4/0x2a8 _raw_spin_lock_irqsave+0x58/0x70 down_trylock+0x20/0x4c __down_trylock_console_sem+0x3c/0x9c console_trylock+0x20/0xb0 vprintk_emit+0x254/0x390 vprintk_default+0x58/0x90 vprintk_func+0xbc/0x164 printk+0x80/0xa0 __dynamic_pr_debug+0x84/0xac gic_raise_softirq+0x184/0x18c smp_cross_call+0xac/0x218 smp_send_reschedule+0x3c/0x48 resched_curr+0x60/0x9c check_preempt_curr+0x70/0xdc wake_up_new_task+0x310/0x470 _do_fork+0x188/0x78c SyS_clone+0x44/0x50 __sys_trace_return+0x0/0x4 other info that might help us debug this: Chain exists of: (console_sem).lock --> &p->pi_lock --> &rq->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rq->lock); lock(&p->pi_lock); lock(&rq->lock); lock((console_sem).lock); *** DEADLOCK *** 2 locks held by dynamic_debug01/1873: #0: (&p->pi_lock){-.-.}, at: [<000000001366df53>] wake_up_new_task+0x40/= 0x470 #1: (&rq->lock){-.-.}, at: [<00000000842e1587>] __task_rq_lock+0x54/0xdc stack backtrace: CPU: 10 PID: 1873 Comm: dynamic_debug01 Tainted: G W 4.15.0+= #1 Hardware name: GIGABYTE R120-T34-00/MT30-GS2-00, BIOS T48 10/02/2017 Call trace: dump_backtrace+0x0/0x188 show_stack+0x24/0x2c dump_stack+0xa4/0xe0 print_circular_bug.isra.31+0x29c/0x2b8 check_prev_add.constprop.39+0x6c8/0x6dc validate_chain.isra.34+0x6e4/0xa20 __lock_acquire+0x3b4/0x6e0 lock_acquire+0xf4/0x2a8 _raw_spin_lock_irqsave+0x58/0x70 down_trylock+0x20/0x4c __down_trylock_console_sem+0x3c/0x9c console_trylock+0x20/0xb0 vprintk_emit+0x254/0x390 vprintk_default+0x58/0x90 vprintk_func+0xbc/0x164 printk+0x80/0xa0 __dynamic_pr_debug+0x84/0xac gic_raise_softirq+0x184/0x18c smp_cross_call+0xac/0x218 smp_send_reschedule+0x3c/0x48 resched_curr+0x60/0x9c check_preempt_curr+0x70/0xdc wake_up_new_task+0x310/0x470 _do_fork+0x188/0x78c SyS_clone+0x44/0x50 __sys_trace_return+0x0/0x4 GICv3: CPU0: ICC_SGI1R_EL1 12000 This could be fixed with printk_deferred() but that might lessen its usefulness for debugging. So change it to pr_devel to keep it out of production kernels. Developers working on gic-v3 can enable it as needed in their kernels. Signed-off-by: Mark Salter Signed-off-by: Marc Zyngier Signed-off-by: Sasha Levin --- drivers/irqchip/irq-gic-v3.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c index 980ae8e7df30..0b73cbae9dae 100644 --- a/drivers/irqchip/irq-gic-v3.c +++ b/drivers/irqchip/irq-gic-v3.c @@ -673,7 +673,7 @@ static void gic_send_sgi(u64 cluster_id, u16 tlist, uns= igned int irq) MPIDR_TO_SGI_RS(cluster_id) | tlist << ICC_SGI1R_TARGET_LIST_SHIFT); =20 - pr_debug("CPU%d: ICC_SGI1R_EL1 %llx\n", smp_processor_id(), val); + pr_devel("CPU%d: ICC_SGI1R_EL1 %llx\n", smp_processor_id(), val); gic_write_sgi1r(val); } =20 --=20 2.15.1