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Tue, 23 Jan 2018 23:18:24 -0500 Received: from mail-sn1nam02on0098.outbound.protection.outlook.com ([104.47.36.98]:53569 "EHLO NAM02-SN1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S933003AbeAXESM (ORCPT ); Tue, 23 Jan 2018 23:18:12 -0500 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Yisheng Xie , Michal Hocko , Andrew Morton , Linus Torvalds , Sasha Levin Subject: [PATCH AUTOSEL for 4.9 39/55] kmemleak: add scheduling point to kmemleak_scan() Thread-Topic: [PATCH AUTOSEL for 4.9 39/55] kmemleak: add scheduling point to kmemleak_scan() Thread-Index: AQHTlMoEExgOg3zbCEetGEgntXACMQ== Date: Wed, 24 Jan 2018 04:15:49 +0000 Message-ID: <20180124041521.32223-39-alexander.levin@microsoft.com> References: <20180124041521.32223-1-alexander.levin@microsoft.com> In-Reply-To: <20180124041521.32223-1-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;DM5PR2101MB0933;7:HlAx36wNe/tyt5wvfAOGcbe8m1aJQyGFZnsnCRimo6AcFb4X1GTb60PiQl1S+zlU6NTyoMPD1S4TunJEAf2jm22/Swv8rlkuusog1iYW9vwJVaWUgGntXvcHio4RqjGkL7zQRUsyjpJqtM707CnpbN9fhoi2paqm6cV8nBEG/MK8g9qjwNMd7E+k+MXfuRTOmoiGqjAhNbsD/yeHdsy8XjCDxiiP8ZMWufmVNoBDKA0UE7oW/C7fzK+RfnzuG0cI x-ms-office365-filtering-correlation-id: 5314fc44-c185-4825-3a3b-08d562e178f7 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(5600026)(4604075)(3008032)(48565401081)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603307)(7193020);SRVR:DM5PR2101MB0933; 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authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-message-info: RpQmhtaQDKh8GQphbmIDCD1OBoVD+vtCZG163Tigji0a8C1JUqDVLslxUCrxnNqbZCMOjdZV7JNXpeD1UfWOHA== 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: 5314fc44-c185-4825-3a3b-08d562e178f7 X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Jan 2018 04:15:49.7523 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB0933 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: Yisheng Xie [ Upstream commit bde5f6bc68db51128f875a756e9082a6c6ff7b4c ] kmemleak_scan() will scan struct page for each node and it can be really large and resulting in a soft lockup. We have seen a soft lockup when do scan while compile kernel: watchdog: BUG: soft lockup - CPU#53 stuck for 22s! [bash:10287] [...] Call Trace: kmemleak_scan+0x21a/0x4c0 kmemleak_write+0x312/0x350 full_proxy_write+0x5a/0xa0 __vfs_write+0x33/0x150 vfs_write+0xad/0x1a0 SyS_write+0x52/0xc0 do_syscall_64+0x61/0x1a0 entry_SYSCALL64_slow_path+0x25/0x25 Fix this by adding cond_resched every MAX_SCAN_SIZE. Link: http://lkml.kernel.org/r/1511439788-20099-1-git-send-email-xieyisheng= 1@huawei.com Signed-off-by: Yisheng Xie Suggested-by: Catalin Marinas Acked-by: Catalin Marinas Cc: Michal Hocko Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- mm/kmemleak.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/kmemleak.c b/mm/kmemleak.c index d1380ed93fdf..20cf3be9a5e8 100644 --- a/mm/kmemleak.c +++ b/mm/kmemleak.c @@ -1442,6 +1442,8 @@ static void kmemleak_scan(void) if (page_count(page) =3D=3D 0) continue; scan_block(page, page + 1, NULL); + if (!(pfn % (MAX_SCAN_SIZE / sizeof(*page)))) + cond_resched(); } } put_online_mems(); --=20 2.11.0