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=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,URIBL_BLOCKED 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 6D1BAC2D0C6 for ; Wed, 11 Dec 2019 18:16:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3D19C206C3 for ; Wed, 11 Dec 2019 18:16:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="eweFvSjh" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729797AbfLKSQx (ORCPT ); Wed, 11 Dec 2019 13:16:53 -0500 Received: from userp2120.oracle.com ([156.151.31.85]:48406 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731241AbfLKSQw (ORCPT ); Wed, 11 Dec 2019 13:16:52 -0500 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.27/8.16.0.27) with SMTP id xBBIFGoU084367; Wed, 11 Dec 2019 18:16:39 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=content-type : mime-version : subject : from : in-reply-to : date : cc : content-transfer-encoding : message-id : references : to; s=corp-2019-08-05; bh=i4xH7e27QyZ1npVo22sCczCev25jOEy12OEbRMrDjaY=; b=eweFvSjhyQa/FhN8VVDZ4DHXz2fbKk9ehZZLXKsSdZph/2J0/J12zw5IrzhcLsAiuctR xvJ0dhvC/ZoLzhXSU/6sivCfVklDw5WtDbQCuSvY9fxcgcPfbMvlrqMdEV6wdOnssyOL 7IvkzDyHoInb6BIZS6ocAtR2uOzC+fMkz+dkPunun+K4Vz9/WmHxBEnH/ycvQLBabr63 HTkIT9D8pk8DHw3lLDDhK4EYXeeUdDwywNdBTaNrvu7/01D+MJmu+imaYc1bbD5PS5wS KFwAiitYZA31Z1kkyGTRZt1xdVCv3XDRZYsIsGMa4BDW5pVkHPliGPak4oeQIIkyI/l7 Yg== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by userp2120.oracle.com with ESMTP id 2wr4qrpa07-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 11 Dec 2019 18:16:39 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.27/8.16.0.27) with SMTP id xBBIGPsX190888; Wed, 11 Dec 2019 18:16:39 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userp3030.oracle.com with ESMTP id 2wu3jypbm7-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 11 Dec 2019 18:16:29 +0000 Received: from abhmp0017.oracle.com (abhmp0017.oracle.com [141.146.116.23]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id xBBIEY5d021025; Wed, 11 Dec 2019 18:14:38 GMT Received: from anon-dhcp-152.1015granger.net (/68.61.232.219) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 11 Dec 2019 10:14:34 -0800 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) Subject: Re: CPU lockup in or near new filecache code From: Chuck Lever In-Reply-To: <3af633a4016a183a930a44e3287f9da230711629.camel@hammerspace.com> Date: Wed, 11 Dec 2019 13:14:33 -0500 Cc: Bruce Fields , Jeff Layton , Linux NFS Mailing List Content-Transfer-Encoding: quoted-printable Message-Id: References: <9977648B-7D14-42EB-BD4A-CBD041A0C21A@oracle.com> <3af633a4016a183a930a44e3287f9da230711629.camel@hammerspace.com> To: Trond Myklebust X-Mailer: Apple Mail (2.3445.104.11) X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9468 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1911140001 definitions=main-1912110152 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9468 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1911140001 definitions=main-1912110152 Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org > On Dec 10, 2019, at 3:45 PM, Trond Myklebust = wrote: >=20 > On Tue, 2019-12-10 at 11:27 -0500, Chuck Lever wrote: >> Under stress, I'm seeing BUGs similar to this quite a bit on my v5.5- >> rc1 NFS server. >> As near as I can tell, the nfsd thread is looping under >> nfsd_file_acquire somewhere. >>=20 >> Dec 9 13:22:52 klimt kernel: watchdog: BUG: soft lockup - CPU#0 >> stuck for 22s! [nfsd:2002] >> Dec 9 13:22:52 klimt kernel: Modules linked in: rpcsec_gss_krb5 >> ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm ocfs2_nodemanager >> ocfs2_stackglue ib_umad ib_ipoib mlx4_ib sb_edac x86_pkg_temp_thermal >> coretemp kvm_intel kvm irqbypass ext4 crct10dif_pclmul crc32_pclmul >> ghash_clmulni_intel mbcache jbd2 iTCO_wdt iTCO_vendor_support >> aesni_intel glue_helper crypto_simd cryptd pcspkr rpcrdma i2c_i801 >> lpc_ich rdma_ucm mfd_core ib_iser rdma_cm mei_me mei iw_cm raid0 >> ib_cm libiscsi sg scsi_transport_iscsi ioatdma wmi ipmi_si >> ipmi_devintf ipmi_msghandler acpi_power_meter nfsd nfs_acl lockd >> auth_rpcgss grace sunrpc ip_tables xfs libcrc32c mlx4_en sr_mod cdrom >> sd_mod qedr ast drm_vram_helper drm_ttm_helper ttm drm_kms_helper >> crc32c_intel syscopyarea sysfillrect sysimgblt fb_sys_fops drm ahci >> libahci libata igb mlx4_core dca i2c_algo_bit i2c_core nvme nvme_core >> qede qed dm_mirror dm_region_hash dm_log dm_mod crc8 ib_uverbs dax >> ib_core >> Dec 9 13:22:52 klimt kernel: CPU: 0 PID: 2002 Comm: nfsd Tainted: >> G L 5.5.0-rc1-00002-gc56d8b96a170 #1400 >> Dec 9 13:22:52 klimt kernel: Hardware name: Supermicro Super >> Server/X10SRL-F, BIOS 1.0c 09/09/2015 >> Dec 9 13:22:52 klimt kernel: RIP: 0010:put_task_struct+0xc/0x28 >> Dec 9 13:22:52 klimt kernel: Code: 05 11 01 00 75 17 48 c7 c7 b1 b4 >> eb 81 31 c0 c6 05 4f 05 11 01 01 e8 a7 ad fd ff 0f 0b c3 48 8d 57 20 >> 83 c8 ff f0 0f c1 47 20 <83> f8 01 75 05 e9 cf 7e fd ff 85 c0 7f 0d >> be 03 00 00 00 48 89 d7 >> Dec 9 13:22:52 klimt kernel: RSP: 0018:ffffc90000f7bb88 EFLAGS: >> 00000213 ORIG_RAX: ffffffffffffff13 >> Dec 9 13:22:52 klimt kernel: RAX: 0000000000000002 RBX: >> ffff888844120000 RCX: 0000000000000000 >> Dec 9 13:22:52 klimt kernel: RDX: ffff888844120020 RSI: >> 0000000000000000 RDI: ffff888844120000 >> Dec 9 13:22:52 klimt kernel: RBP: 0000000000000001 R08: >> ffff888817527b00 R09: ffffffff8121d707 >> Dec 9 13:22:52 klimt kernel: R10: ffffc90000f7bbc8 R11: >> 000000008e6571d9 R12: ffff888855055750 >> Dec 9 13:22:52 klimt kernel: R13: 0000000000000000 R14: >> ffff88882dcd9320 R15: ffff88881741a8c0 >> Dec 9 13:22:52 klimt kernel: FS: 0000000000000000(0000) >> GS:ffff88885fc00000(0000) knlGS:0000000000000000 >> Dec 9 13:22:52 klimt kernel: CS: 0010 DS: 0000 ES: 0000 CR0: >> 0000000080050033 >> Dec 9 13:22:52 klimt kernel: CR2: 00007f816a386000 CR3: >> 0000000855686003 CR4: 00000000001606f0 >> Dec 9 13:22:52 klimt kernel: Call Trace: >> Dec 9 13:22:52 klimt kernel: wake_up_q+0x34/0x40 >> Dec 9 13:22:52 klimt kernel: >> __mutex_unlock_slowpath.isra.14+0x9d/0xeb >> Dec 9 13:22:52 klimt kernel: fsnotify_add_mark+0x53/0x5d >> Dec 9 13:22:52 klimt kernel: nfsd_file_acquire+0x423/0x576 [nfsd] >> Dec 9 13:22:52 klimt kernel: nfs4_get_vfs_file+0x14c/0x20f [nfsd] >> Dec 9 13:22:52 klimt kernel: nfsd4_process_open2+0xcd6/0xd98 [nfsd] >> Dec 9 13:22:52 klimt kernel: ? fh_verify+0x42e/0x4ef [nfsd] >> Dec 9 13:22:52 klimt kernel: ? nfsd4_process_open1+0x233/0x29d >> [nfsd] >> Dec 9 13:22:52 klimt kernel: nfsd4_open+0x500/0x5cb [nfsd] >> Dec 9 13:22:52 klimt kernel: nfsd4_proc_compound+0x32a/0x5c7 [nfsd] >> Dec 9 13:22:52 klimt kernel: nfsd_dispatch+0x102/0x1e2 [nfsd] >> Dec 9 13:22:52 klimt kernel: svc_process_common+0x3b3/0x65d [sunrpc] >> Dec 9 13:22:52 klimt kernel: ? svc_xprt_put+0x12/0x21 [sunrpc] >> Dec 9 13:22:52 klimt kernel: ? nfsd_svc+0x2be/0x2be [nfsd] >> Dec 9 13:22:52 klimt kernel: ? nfsd_destroy+0x51/0x51 [nfsd] >> Dec 9 13:22:52 klimt kernel: svc_process+0xf6/0x115 [sunrpc] >> Dec 9 13:22:52 klimt kernel: nfsd+0xf2/0x149 [nfsd] >> Dec 9 13:22:52 klimt kernel: kthread+0xf6/0xfb >> Dec 9 13:22:52 klimt kernel: ? kthread_queue_delayed_work+0x74/0x74 >> Dec 9 13:22:52 klimt kernel: ret_from_fork+0x3a/0x50 >>=20 >=20 > Does the very first patch in the series I just sent out help? The test is to run (cd git; make -j12 test) on a 12-core client over NFSv4.1 on RDMA with disconnect injection enabled. I run the test with sys, krb5, krb5i, and krb5p. The server used to crash 0-2 times per security flavor. With your patch applied the server was stable enough to complete all four security flavors without a kworker lockup. A definite improvement. For the first patch: Tested-by: Chuck Lever -- Chuck Lever