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=-1.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 DEA36C4CEC9 for ; Sat, 14 Sep 2019 21:37:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9A8192081B for ; Sat, 14 Sep 2019 21:37:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="bH7xratI" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727244AbfINVhD (ORCPT ); Sat, 14 Sep 2019 17:37:03 -0400 Received: from mail-qt1-f194.google.com ([209.85.160.194]:44271 "EHLO mail-qt1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727102AbfINVhC (ORCPT ); Sat, 14 Sep 2019 17:37:02 -0400 Received: by mail-qt1-f194.google.com with SMTP id u40so38382207qth.11 for ; Sat, 14 Sep 2019 14:37:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=message-id:subject:from:to:date:user-agent:mime-version; bh=yDq+/SiiVkfo2gjXraInXYz1jFFL2AMLdRdcrQ12W8o=; b=bH7xratInqTFLxvfmzns6nhL3epp0+7b0Qv05J6+wCeh6i3oU4tZOQE8QvuSTw5rBm UsJTThPCnwLODp0amEyRLh1Qf6vJ7ve0VXdrpwfMvhRoV/sZUgDcyUwSU4zuHXW2HIpO JpsMjIZVVBPhbE5D/OxO0xqBXGka36zTGHbPnL9tr0vvk78MtSoEAox7cRkgtVbcQHYU OdTfF45gwMpXlitEFtk3DmepWYRnr8RtHoTKLufNZgLCQ3Bw8Qw4juw/IKOe+RFnakEU 13IOVkKHxtx6gYED4M24xhXXACnw4X95q4MlwuEMZ54oLABct7sswNTXGdyu0qH2AgWP Fp4w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:message-id:subject:from:to:date:user-agent :mime-version; bh=yDq+/SiiVkfo2gjXraInXYz1jFFL2AMLdRdcrQ12W8o=; b=joCKZbLZm++D2uTr+u/34VZCMV4M/LI6l9owsUSNAgLeKH1VwoTjpXhVBJUTtioz8n K5SKNZiEy8ALQYz3pVG76RzsevmCjqraCLbsVLMC3zmmE2c8JlItrK6vyrBTIwfxy+NN 7548KaZ8lFMLEKJO7VqnTQhrz/+pEFjxfa801yIEgSnlt9ySzhW8iv2hPj33k/IWO62C E3Aiy3YjbR0IIa6MiUQoidImIwff5+T03EiUZWfHThHqrw69U+BnPFYeo1+xLJXyHUN0 a8/dRmbH4rgl7H81rrvND3wbcn/fLg4qPwvp8WBGQGHfKHt6y8zabdsXvpHiS2IVDUAs ygwg== X-Gm-Message-State: APjAAAURX8+eSIxdfE+Nyt+AQ8wEnj1/Dt1aCnIIOW6DBQ+/H/fJbxce SFw148c/d0Wy5+en6kc1npNerZOs X-Google-Smtp-Source: APXvYqwyn4YUvF6nhXRG3EEn3tFecT54sfGDkDwDkQ3UKIeRe+80flCOaHiEeht3zzTeR6aDaFQmxg== X-Received: by 2002:ad4:43e5:: with SMTP id f5mr32640973qvu.101.1568497021246; Sat, 14 Sep 2019 14:37:01 -0700 (PDT) Received: from ?IPv6:2604:6000:1014:c7c6:3870:3b84:b31a:588b? ([2604:6000:1014:c7c6:3870:3b84:b31a:588b]) by smtp.gmail.com with ESMTPSA id k199sm15978358qke.45.2019.09.14.14.36.59 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 14 Sep 2019 14:37:00 -0700 (PDT) Message-ID: Subject: while (1) in btrfs_relocate_block_group didn't end From: Cebtenzzre To: linux-btrfs@vger.kernel.org Date: Sat, 14 Sep 2019 17:36:58 -0400 Content-Type: multipart/mixed; boundary="=-FXKFMY5XADEAblN0olw7" User-Agent: Evolution 3.34.0 MIME-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org --=-FXKFMY5XADEAblN0olw7 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Hi, I started a balance of one block group, and I saw this in dmesg: BTRFS info (device sdi1): balance: start -dvrange=2236714319872..2236714319873 BTRFS info (device sdi1): relocating block group 2236714319872 flags data|raid0 BTRFS info (device sdi1): found 1 extents BTRFS info (device sdi1): found 1 extents BTRFS info (device sdi1): found 1 extents BTRFS info (device sdi1): found 1 extents BTRFS info (device sdi1): found 1 extents It continued like that for a total of 754 lines until I rebooted. Before that, I captured some debug info. I ran this in my shell for a few seconds, where PID is the pid of the process that called the balance ioctl: integer i=0; while true; do sudo cat /proc/PID/stack >stack$i; sleep .01010101; i+=1; done Which effectively gave me stack samples at (close to) 99Hz. Maybe not ideal, but I was in a hurry and I didn't want my disks to sustain such heavy, repetitive I/O for too long. I've attached the stack samples as stacks.tar.gz. A few of them are empty. To me, it looks like the kernel never left the while (1) loop in btrfs_relocate_block_group. The kernel messages seem to confirm this. I am using Arch Linux with kernel version 5.2.14-arch2, and I specified "slub_debug=P,kmalloc-2k" in the kernel cmdline to detect and protect against a use-after-free that I found when I had KASAN enabled. Would that kernel parameter result in a silent retry if it hit the use-after- free? -- Cebtenzzre --=-FXKFMY5XADEAblN0olw7 Content-Type: application/x-compressed-tar; name="stacks.tar.gz" Content-Disposition: attachment; filename="stacks.tar.gz" Content-Transfer-Encoding: base64 H4sIAAAAAAACA+2dTY/jOJJA6zy/ou8LzJAUJUrAYoHFXuc2p8VgYPhD7i5UZrlb6dqa+vdrUrbL tmTnh7ODYeeLSwOdTCNtVbxHSxHBp/V0/uXpb5/+zDCbCGUZ/2tDaQ7/u4tPtiiL4ApTpXXBhfDp l/KTQHx7Wk+7X3759EHjqb/+6T/mT7z+lffnrr81rvp5/b39tPk/3thPvxiu/58e//xP81//+mW2 7pZPk/nq8fHzerLupl+fpvP159XX/zD/Dq76m/l3MzW//DOt+tdf+l/5vWt/n3btZL2adO3Daj5d t5vV1hSb1bY8Xb1bMplt/vtl8mu3+vZ7evHN6sqdru7/nDO/Y8v4B7nFM780/+3b1y+b5YXdrJ6O L55NH6Zf5/HvDna6Wda24+s+r+brh4PVrol/d+EvrN6sqv08rjLV6bLFavJ/B+t8sYifwtxsf/zl 6cfPH5Zt/PR3P5pM/l35yeHPbfowzM9X3vxwPn14mFQ+/vYyXo3F7sft13X3Y/KP//3H//z33/++ WTGZLtdtN/nt+7KbPsY35n38sJq/fCI+IP+tJv47+A//4T/8J6T47zTxv4D/8B/+w39Civ+FJv57 +A//4T/8J6T47/Pw//j5T8//IsB/8etf5rn+1pdD/9uS6y/n/8lk+fmhfZz+Plkupuvp9+lmG7DZ 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