From patchwork Mon Jun 12 05:24:51 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shuai Xue X-Patchwork-Id: 106257 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:994d:0:b0:3d9:f83d:47d9 with SMTP id k13csp2372702vqr; Sun, 11 Jun 2023 22:40:28 -0700 (PDT) X-Google-Smtp-Source: ACHHUZ4qsDAyT+FAA/XyMBYEqoR9zDFgwz/U6vYEsYTOlMjb/FLeAkPKjbKl/J7QgI748V60sZDN X-Received: by 2002:a17:906:6a1a:b0:97d:f8aa:6d51 with SMTP id qw26-20020a1709066a1a00b0097df8aa6d51mr5592202ejc.19.1686548428492; Sun, 11 Jun 2023 22:40:28 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1686548428; cv=none; d=google.com; s=arc-20160816; b=QqKKMgtLdRSeFW0J3hRXWjbRzPkYYTaHUWjZnjqUQThgCKmhqBaxIyjMsqLcdZ076m GDBiMs/+46rOvoyLKmI96fBAvARWxZYZPEVwkhRnEbv5C1uwMmewPosVyyjVMfSK+7zn qnxzES1q62TXpuYq6grdRwfLJSh9/rZr4bqQLDuSb9Ef3Hv1TeRMv+XfmrhW3pNQey/P qHJlrotW7X2QxQj0/pUDbZ+8mPnoDGqiCmZT5nYKBel3Mp2/kkQuRkjOOJpg9SdXEezw Po/2ZAj2hQFAnm16ZHprU6YyO+/y1keGJhl5yFZ1yGKth07BrohkPhiLuwVsOKM8EVvU xtkQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from; bh=Yu/YQZZWIPJ9mDrefEQN+9oO4iB4HniPHO5rTTSzPVI=; b=lcPUEAd3NdhJfETAFKeVYOq0g00Wru1jDFDRggJy08kNWIlTRzz29j52zPoQJ5MTvW KrsxaagrUYYbE8dGWcLC5by8hxc9FgTmbGn8iucAncmJseMtIwX5/zzJvpBZ9L0xkXx6 FwYD/l5jiR6VnIWLg85Kt8aXGlH/PS8dsp6kKefqGV7cT+masKD5YeJe39AEvh0LWdvu iol3AxT/coRfDNnAfu1aWmJDxBnUBhidgxzlVbhIUM9SZZuJdzm02r3+myzWh63CTmrc 7sb1ujUGFWc2Ls/y+zeMR12cNxTe3F6zxsXxVgJBW1vK0Fw3h2WpybRDe4JFHVlzPW6N yYvg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=alibaba.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id l14-20020a170906414e00b0094effaaa050si4628287ejk.50.2023.06.11.22.40.02; Sun, 11 Jun 2023 22:40:28 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=alibaba.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233584AbjFLFZT (ORCPT + 99 others); Mon, 12 Jun 2023 01:25:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35632 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231391AbjFLFZE (ORCPT ); Mon, 12 Jun 2023 01:25:04 -0400 Received: from out30-101.freemail.mail.aliyun.com (out30-101.freemail.mail.aliyun.com [115.124.30.101]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 09573DF; Sun, 11 Jun 2023 22:25:01 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R631e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018045176;MF=xueshuai@linux.alibaba.com;NM=1;PH=DS;RN=12;SR=0;TI=SMTPD_---0VkrnYGX_1686547497; Received: from localhost.localdomain(mailfrom:xueshuai@linux.alibaba.com fp:SMTPD_---0VkrnYGX_1686547497) by smtp.aliyun-inc.com; Mon, 12 Jun 2023 13:24:58 +0800 From: Shuai Xue To: alexander.shishkin@linux.intel.com, peterz@infradead.org Cc: mingo@redhat.com, acme@kernel.org, mark.rutland@arm.com, jolsa@kernel.org, namhyung@kernel.org, irogers@google.com, adrian.hunter@intel.com, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH 1/2] perf/core: Bail out early if the request AUX area is out of bound Date: Mon, 12 Jun 2023 13:24:51 +0800 Message-Id: <20230612052452.53425-2-xueshuai@linux.alibaba.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230612052452.53425-1-xueshuai@linux.alibaba.com> References: <20230612052452.53425-1-xueshuai@linux.alibaba.com> MIME-Version: 1.0 X-Spam-Status: No, score=-9.9 required=5.0 tests=BAYES_00, ENV_AND_HDR_SPF_MATCH,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS, T_SCC_BODY_TEXT_LINE,UNPARSEABLE_RELAY,USER_IN_DEF_SPF_WL autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1768474204927598209?= X-GMAIL-MSGID: =?utf-8?q?1768474204927598209?= When perf-record with a large AUX area, e.g 4GB, it fails with: #perf record -C 0 -m ,4G -e arm_spe_0// -- sleep 1 failed to mmap with 12 (Cannot allocate memory) and it reveals a WARNING with __alloc_pages: [ 66.595604] ------------[ cut here ]------------ [ 66.600206] WARNING: CPU: 44 PID: 17573 at mm/page_alloc.c:5568 __alloc_pages+0x1ec/0x248 [ 66.608375] Modules linked in: ip6table_filter(E) ip6_tables(E) iptable_filter(E) ebtable_nat(E) ebtables(E) aes_ce_blk(E) vfat(E) fat(E) aes_ce_cipher(E) crct10dif_ce(E) ghash_ce(E) sm4_ce_cipher(E) sm4(E) sha2_ce(E) sha256_arm64(E) sha1_ce(E) acpi_ipmi(E) sbsa_gwdt(E) sg(E) ipmi_si(E) ipmi_devintf(E) ipmi_msghandler(E) ip_tables(E) sd_mod(E) ast(E) drm_kms_helper(E) syscopyarea(E) sysfillrect(E) nvme(E) sysimgblt(E) i2c_algo_bit(E) nvme_core(E) drm_shmem_helper(E) ahci(E) t10_pi(E) libahci(E) drm(E) crc64_rocksoft(E) i40e(E) crc64(E) libata(E) i2c_core(E) [ 66.657719] CPU: 44 PID: 17573 Comm: perf Kdump: loaded Tainted: G E 6.3.0-rc4+ #58 [ 66.666749] Hardware name: Default Default/Default, BIOS 1.2.M1.AL.P.139.00 03/22/2023 [ 66.674650] pstate: 23400009 (nzCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) [ 66.681597] pc : __alloc_pages+0x1ec/0x248 [ 66.685680] lr : __kmalloc_large_node+0xc0/0x1f8 [ 66.690285] sp : ffff800020523980 [ 66.693585] pmr_save: 000000e0 [ 66.696624] x29: ffff800020523980 x28: ffff000832975800 x27: 0000000000000000 [ 66.703746] x26: 0000000000100000 x25: 0000000000100000 x24: ffff8000083615d0 [ 66.710866] x23: 0000000000040dc0 x22: ffff000823d6d140 x21: 000000000000000b [ 66.717987] x20: 000000000000000b x19: 0000000000000000 x18: 0000000000000030 [ 66.725108] x17: 0000000000000000 x16: ffff800008f05be8 x15: ffff000823d6d6d0 [ 66.732229] x14: 0000000000000000 x13: 343373656761705f x12: 726e202c30206574 [ 66.739350] x11: 00000000ffff7fff x10: 00000000ffff7fff x9 : ffff8000083af570 [ 66.746471] x8 : 00000000000bffe8 x7 : c0000000ffff7fff x6 : 000000000005fff4 [ 66.753592] x5 : 0000000000000000 x4 : ffff000823d6d8d8 x3 : 0000000000000000 [ 66.760713] x2 : 0000000000000000 x1 : 0000000000000001 x0 : 0000000000040dc0 [ 66.767834] Call trace: [ 66.770267] __alloc_pages+0x1ec/0x248 [ 66.774003] __kmalloc_large_node+0xc0/0x1f8 [ 66.778259] __kmalloc_node+0x134/0x1e8 [ 66.782081] rb_alloc_aux+0xe0/0x298 [ 66.785643] perf_mmap+0x440/0x660 [ 66.789031] mmap_region+0x308/0x8a8 [ 66.792593] do_mmap+0x3c0/0x528 [ 66.795807] vm_mmap_pgoff+0xf4/0x1b8 [ 66.799456] ksys_mmap_pgoff+0x18c/0x218 [ 66.803365] __arm64_sys_mmap+0x38/0x58 [ 66.807187] invoke_syscall+0x50/0x128 [ 66.810922] el0_svc_common.constprop.0+0x58/0x188 [ 66.815698] do_el0_svc+0x34/0x50 [ 66.818999] el0_svc+0x34/0x108 [ 66.822127] el0t_64_sync_handler+0xb8/0xc0 [ 66.826296] el0t_64_sync+0x1a4/0x1a8 [ 66.829946] ---[ end trace 0000000000000000 ]--- The pages for AUX area are organized as rb->aux_pages[] which alloced by kcalloc_node() later. The kcalloc() family guarantees the pages are physically contiguous (and virtually contiguous) with an order of MAX_ORDER - 1 at maximum. So bail out early with -EINVAL if the request AUX area is out of bound, e.g.: #perf record -C 0 -m ,4G -e arm_spe_0// -- sleep 1 failed to mmap with 22 (Invalid argument) Signed-off-by: Shuai Xue --- kernel/events/core.c | 10 ++++++++++ tools/perf/Documentation/perf-record.txt | 3 ++- 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index 435815d..83d4e29 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -6404,6 +6404,16 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma) return -EINVAL; nr_pages = vma_size / PAGE_SIZE; + /* + * The pages for AUX area are organized as rb->aux_pages[] + * which alloced by kcalloc_node() later. The kcalloc() family + * guarantees the pages are physically contiguous (and + * virtually contiguous) with an order of MAX_ORDER - 1 at + * maximum MAX_ORDER. So bail out early if the request AUX area + * is out of bound. + */ + if (get_order(nr_pages * sizeof(void *)) >= MAX_ORDER) + return -EINVAL; mutex_lock(&event->mmap_mutex); ret = -EINVAL; diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index ff815c2..a50a426 100644 --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -236,7 +236,8 @@ OPTIONS specification with appended unit character - B/K/M/G. The size is rounded up to have nearest pages power of two value. Also, by adding a comma, the number of mmap pages for AUX - area tracing can be specified. + area tracing can be specified. With MAX_ORDER set as 11, the + maximum AUX area is limit to 2GB. -g:: Enables call-graph (stack chain/backtrace) recording for both From patchwork Mon Jun 12 05:24:52 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shuai Xue X-Patchwork-Id: 106258 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:994d:0:b0:3d9:f83d:47d9 with SMTP id k13csp2372708vqr; Sun, 11 Jun 2023 22:40:29 -0700 (PDT) X-Google-Smtp-Source: ACHHUZ6D3bdUYCpaC97li3T/49tdKcWoZK6qrrP/e3+wX02WofPF8XbU7Epto/Ebtd+FK9fP79t1 X-Received: by 2002:a05:6402:550:b0:514:9563:a32b with SMTP id i16-20020a056402055000b005149563a32bmr4317697edx.16.1686548429693; Sun, 11 Jun 2023 22:40:29 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1686548429; cv=none; d=google.com; s=arc-20160816; b=auJ5zqHq+74DlSkWDt2kmZFRT0tRZ6ApTtOK3rdNVn8bIuVGlX1ni9EdnKCiO/GohE ZFHNYh9f9bPROMdeLR5lYS8/G1F4F5b/G5uYYmjBeivTa5n0R80i65/Z3/SZ0OlStRUL 4SaZU10jMDh1GEPIGVcGWT5RPpNg720faNUo5qsl3663XMBUWeIlXJDvsGwMA9hSOSzN KBV+Z+yAqAAfzAZ1yDZpOChk4M+AtV1ry2aZ2gc8uAVPZIh1NKplxex5wq4vOgt+ZF9s 2oL5WyDfVUUbkGfBPGXBErew0+STn/SlNTFkL1XwBp6LJhb+gkeUYIxoMuHUX6WmIgrO qljw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from; bh=JQMbkzuOQ5kslAbCs/mvFCzCMlfNfOJ/3gBDG2ldZyc=; b=af/RaEC545V5Ev8G9uQmCY73/eD1+WEPFfTNeBPq49VPIPUodPzV68PXxTlXvXgZni ypmBAAQJR9yBmBAd/KUNEs9yhRqJE8l/L2OdsfBDEw+gLpOrATv7c3Jxg8kjruCwkdVL AEVGdeFCx1UcDV5aabMU1domHVEU0WKRmnoh5NIB+4BBKGJKEQ7/yLk60JNCacfl1yNR ++PUl4wo/geheVq87gecFgyCzzTCKxOEjM0o5RTbCAHVTLBucxyV95fy7UDmyQC2WFQ4 n5J4pJFT+pvOG3wrFxQUAsXbSDma3F/5VWvK4S1FHZ4XN3uqR9O6+q9V+w1TjdvINoo9 Ef2A== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=alibaba.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id x24-20020aa7dad8000000b0050d0ddf6582si5557425eds.474.2023.06.11.22.40.04; Sun, 11 Jun 2023 22:40:29 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=alibaba.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234150AbjFLFZa (ORCPT + 99 others); Mon, 12 Jun 2023 01:25:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35646 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234629AbjFLFZG (ORCPT ); Mon, 12 Jun 2023 01:25:06 -0400 Received: from out30-98.freemail.mail.aliyun.com (out30-98.freemail.mail.aliyun.com [115.124.30.98]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 417AAE1; Sun, 11 Jun 2023 22:25:04 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R191e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018045170;MF=xueshuai@linux.alibaba.com;NM=1;PH=DS;RN=12;SR=0;TI=SMTPD_---0VkrnYHA_1686547498; Received: from localhost.localdomain(mailfrom:xueshuai@linux.alibaba.com fp:SMTPD_---0VkrnYHA_1686547498) by smtp.aliyun-inc.com; Mon, 12 Jun 2023 13:25:00 +0800 From: Shuai Xue To: alexander.shishkin@linux.intel.com, peterz@infradead.org Cc: mingo@redhat.com, acme@kernel.org, mark.rutland@arm.com, jolsa@kernel.org, namhyung@kernel.org, irogers@google.com, adrian.hunter@intel.com, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH 2/2] perf/ring_buffer: Fix high-order allocations for AUX space with correct MAX_ORDER limit Date: Mon, 12 Jun 2023 13:24:52 +0800 Message-Id: <20230612052452.53425-3-xueshuai@linux.alibaba.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230612052452.53425-1-xueshuai@linux.alibaba.com> References: <20230612052452.53425-1-xueshuai@linux.alibaba.com> MIME-Version: 1.0 X-Spam-Status: No, score=-9.9 required=5.0 tests=BAYES_00, ENV_AND_HDR_SPF_MATCH,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS, T_SCC_BODY_TEXT_LINE,UNPARSEABLE_RELAY,USER_IN_DEF_SPF_WL autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1768474206277304510?= X-GMAIL-MSGID: =?utf-8?q?1768474206277304510?= When perf-record with a large AUX area, e.g 2GB: #perf record -C 0 -m ,2G -e arm_spe_0// -- sleep 1 it reveals a WARNING with __alloc_pages: [ 48.888553] ------------[ cut here ]------------ [ 48.888559] WARNING: CPU: 39 PID: 17438 at mm/page_alloc.c:5568 __alloc_pages+0x1ec/0x248 [ 48.888569] Modules linked in: ip6table_filter(E) ip6_tables(E) iptable_filter(E) ebtable_nat(E) ebtables(E) vfat(E) fat(E) aes_ce_blk(E) aes_ce_cipher(E) crct10dif_ce(E) ghash_ce(E) sm4_ce_cipher(E) sm4(E) sha2_ce(E) sha256_arm64(E) sha1_ce(E) acpi_ipmi(E) sbsa_gwdt(E) sg(E) ipmi_si(E) ipmi_devintf(E) ipmi_msghandler(E) ip_tables(E) sd_mod(E) ast(E) drm_kms_helper(E) syscopyarea(E) sysfillrect(E) nvme(E) sysimgblt(E) i2c_algo_bit(E) nvme_core(E) drm_shmem_helper(E) ahci(E) t10_pi(E) libahci(E) drm(E) crc64_rocksoft(E) i40e(E) crc64(E) libata(E) i2c_core(E) [ 48.888610] CPU: 39 PID: 17438 Comm: perf Kdump: loaded Tainted: G E 6.3.0-rc4+ #56 [ 48.888613] Hardware name: Default Default/Default, BIOS 1.2.M1.AL.P.139.00 03/22/2023 [ 48.888614] pstate: 23400009 (nzCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) [ 48.888616] pc : __alloc_pages+0x1ec/0x248 [ 48.888619] lr : rb_alloc_aux_page+0x78/0xe0 [ 48.888622] sp : ffff800037c5b9e0 [ 48.888623] pmr_save: 000000e0 [ 48.888624] x29: ffff800037c5b9e0 x28: ffff00082743b800 x27: 0000000000000000 [ 48.888627] x26: 0000000000080000 x25: ffff000000000000 x24: ffff000860b21380 [ 48.888629] x23: ffff8000093fd3c0 x22: ffff00081a4a2080 x21: 000000000000000b [ 48.888631] x20: 0000000000000000 x19: 000000000000000b x18: 0000000000000020 [ 48.888634] x17: 0000000000000000 x16: ffff800008f05be8 x15: ffff00081a4a2610 [ 48.888636] x14: 0000000000000000 x13: 323173656761705f x12: ffff00477fffeb90 [ 48.888638] x11: 0000000000000000 x10: 0000000000000000 x9 : ffff8000083608a0 [ 48.888641] x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000040 [ 48.888643] x5 : 000000000007f400 x4 : 0000000000000000 x3 : 0000000000000000 [ 48.888645] x2 : 0000000000000000 x1 : 0000000000000001 x0 : 0000000000012dc0 [ 48.888648] Call trace: [ 48.888650] __alloc_pages+0x1ec/0x248 [ 48.888653] rb_alloc_aux_page+0x78/0xe0 [ 48.888654] rb_alloc_aux+0x13c/0x298 [ 48.888656] perf_mmap+0x468/0x688 [ 48.888659] mmap_region+0x308/0x8a8 [ 48.888662] do_mmap+0x3c0/0x528 [ 48.888664] vm_mmap_pgoff+0xf4/0x1b8 [ 48.888666] ksys_mmap_pgoff+0x18c/0x218 [ 48.888668] __arm64_sys_mmap+0x38/0x58 [ 48.888671] invoke_syscall+0x50/0x128 [ 48.888673] el0_svc_common.constprop.0+0x58/0x188 [ 48.888674] do_el0_svc+0x34/0x50 [ 48.888676] el0_svc+0x34/0x108 [ 48.888679] el0t_64_sync_handler+0xb8/0xc0 [ 48.888681] el0t_64_sync+0x1a4/0x1a8 [ 48.888686] ---[ end trace 0000000000000000 ]--- The problem is that the high-order pages for AUX area is allocated with an order of MAX_ORDER. Obviously, this is a bogus. Fix it with an order of MAX_ORDER - 1 at maximum. Fixes: 0a4e38e64f5e ("perf: Support high-order allocations for AUX space") Signed-off-by: Shuai Xue Reviewed-by: Leo Yan --- kernel/events/ring_buffer.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c index 273a0fe..d6bbdb7 100644 --- a/kernel/events/ring_buffer.c +++ b/kernel/events/ring_buffer.c @@ -609,8 +609,8 @@ static struct page *rb_alloc_aux_page(int node, int order) { struct page *page; - if (order > MAX_ORDER) - order = MAX_ORDER; + if (order >= MAX_ORDER) + order = MAX_ORDER - 1; do { page = alloc_pages_node(node, PERF_AUX_GFP, order);