From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AD6E6C433B4 for ; Fri, 2 Apr 2021 01:49:41 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 178BD610CF for ; Fri, 2 Apr 2021 01:49:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 178BD610CF Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=e16-tech.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 5BAAA6B0070; Thu, 1 Apr 2021 21:49:40 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 543E36B0071; Thu, 1 Apr 2021 21:49:40 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3E6BC6B0073; Thu, 1 Apr 2021 21:49:40 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0093.hostedemail.com [216.40.44.93]) by kanga.kvack.org (Postfix) with ESMTP id 1B4856B0070 for ; Thu, 1 Apr 2021 21:49:40 -0400 (EDT) Received: from smtpin31.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id CA2F1F045 for ; Fri, 2 Apr 2021 01:49:39 +0000 (UTC) X-FDA: 77985745278.31.C2E02B9 Received: from out20-75.mail.aliyun.com (out20-75.mail.aliyun.com [115.124.20.75]) by imf07.hostedemail.com (Postfix) with ESMTP id CCC70A0000FA for ; Fri, 2 Apr 2021 01:49:37 +0000 (UTC) X-Alimail-AntiSpam:AC=CONTINUE;BC=0.05719094|-1;CH=green;DM=|CONTINUE|false|;DS=CONTINUE|ham_system_inform|0.0164868-0.000325774-0.983187;FP=0|0|0|0|0|-1|-1|-1;HT=ay29a033018047193;MF=wangyugui@e16-tech.com;NM=1;PH=DS;RN=2;RT=2;SR=0;TI=SMTPD_---.JtsLBbF_1617328173; Received: from 192.168.2.112(mailfrom:wangyugui@e16-tech.com fp:SMTPD_---.JtsLBbF_1617328173) by smtp.aliyun-inc.com(10.147.42.198); Fri, 02 Apr 2021 09:49:33 +0800 Date: Fri, 02 Apr 2021 09:49:40 +0800 From: Wang Yugui To: linux-mm@kvack.org, Wang Yugui Subject: Re: unexpected -ENOMEM from percpu_counter_init() In-Reply-To: <20210401185158.3275.409509F4@e16-tech.com> References: <20210401185158.3275.409509F4@e16-tech.com> Message-Id: <20210402094939.E35D.409509F4@e16-tech.com> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Becky! ver. 2.75.03 [en] X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: CCC70A0000FA X-Stat-Signature: 5a4g6mkc4a1cqmnuuiaewoznfo6dxobx Received-SPF: none (e16-tech.com>: No applicable sender policy available) receiver=imf07; identity=mailfrom; envelope-from=""; helo=out20-75.mail.aliyun.com; client-ip=115.124.20.75 X-HE-DKIM-Result: none/none X-HE-Tag: 1617328177-387419 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hi, This problem happend in 5.12.0-0.rc5.20210331git2bb25b3a748a too. https://kojipkgs.fedoraproject.org/packages/kernel/5.12.0/0.rc5.20210331git2bb25b3a748a.181.eln110/ Best Regards Wang Yugui (wangyugui@e16-tech.com) 2021/04/02 > Hi, > > an unexpected -ENOMEM from percpu_counter_init() happened when xfstest > with kernel 5.11.10 and 5.10.27 > > direct caller: > int btrfs_drew_lock_init(struct btrfs_drew_lock *lock) > { > int ret; > > ret = percpu_counter_init(&lock->writers, 0, GFP_KERNEL); > if (ret) > return ret; > > atomic_set(&lock->readers, 0); > init_waitqueue_head(&lock->pending_readers); > init_waitqueue_head(&lock->pending_writers); > > return 0; > } > > upper caller: > nofs_flag = memalloc_nofs_save(); > ret = btrfs_drew_lock_init(&root->snapshot_lock); > memalloc_nofs_restore(nofs_flag); > if (ret == -ENOMEM) printk("ENOMEM btrfs_drew_lock_init\n"); > if (ret) > goto fail; > > The hardware of this server: > CPU: Xeon(R) CPU E5-2660 v2(10 core) *2 > memory: 192G, no swap > > Only one xfstests job is running in this server, and about 7% of memory > is used. > > Any advice please. > > Best Regards > Wang Yugui (wangyugui@e16-tech.com) > 2021/04/01