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=-1.0 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 6E822C43381 for ; Fri, 8 Mar 2019 06:16:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3F03E20811 for ; Fri, 8 Mar 2019 06:16:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=intel-com.20150623.gappssmtp.com header.i=@intel-com.20150623.gappssmtp.com header.b="G90htT7j" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726352AbfCHGQ3 (ORCPT ); Fri, 8 Mar 2019 01:16:29 -0500 Received: from mail-oi1-f181.google.com ([209.85.167.181]:39241 "EHLO mail-oi1-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725766AbfCHGQ3 (ORCPT ); Fri, 8 Mar 2019 01:16:29 -0500 Received: by mail-oi1-f181.google.com with SMTP id b4so15026054oif.6 for ; Thu, 07 Mar 2019 22:16:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=intel-com.20150623.gappssmtp.com; s=20150623; h=mime-version:from:date:message-id:subject:to:cc; bh=HkJjVI6tIdHfZT2Gp2wLj/2Yp7f77KztMPdI+j+YZ6g=; b=G90htT7jURybdSoXMBltJSlWp4bqs4qDDNdMEVzS0yB9rEDYJMb9EZYPzWL0+aZsqq tYfMv3RLKpM4h3kZ4r0mGxdQ8GvTYdujS+2t1rFqXGhXgXgWzwWv82uD/dlyIl/Fag97 m94BV+vyeMup1mx7be5Woj5MAb3TX+rT5Ldtrb2PEPswUEp6M2p3yoS4hc0QM0uK43v6 Kz6n5eIxW7L4iA9Y+hEhuYWmjC9NSSAWgRNNV3Z6bmwYOMMGwxkjCkqA9+NqlE9nLPRA ITj4pm4O391cTLctYbAfdgFGs/0FG6s0lm0p5VzXULEnfcYtYs1axHOFBvThyFnjuYea Ksfg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=HkJjVI6tIdHfZT2Gp2wLj/2Yp7f77KztMPdI+j+YZ6g=; b=BhrGPwY+K8DJGh2yIcinjvS8pQQY0faPa12vfZ+pSoJDh2k5puCKXmTTYIaWj9mpGG BccYsMXmEG9QH5iIpUpdEKKFoFPvegVv0WXeao1BYxpI67YAuSrifjC+2KuJTA9JWB0f EGdqNMgMfDL7f7kR/pZO2qY97ZQx0sJ6vaf/M+uvHLKt6tC84dn+yhfRTisovGj9Cx2U 6pDE2q523dAkb06GvcvqtdbwbpVPRszdBhS/nLk2HBs0b91d6E42S/aiuPS+7UQfdRnC r12dcxXD9T65KWWkjIdr4tP81HWQOAIwZoM6FsZF2IsLyGLbqylesuPDFYfrF9/DKwVY O/nw== X-Gm-Message-State: APjAAAX5Tsl+GOfqx2SPFPb8qqgeQm7/5dmkKSYLbT3e/9ROlL5VFjhr CKxoWzy9yw283tjt2U0rtlNYjzH5DcoGlWHJOWk25paE40w= X-Google-Smtp-Source: APXvYqyg6kP94ErfGvju2F2CmJtzdYcpR4nmSHzVbmbmw9NSus2juATwoLdk28eKC1La9UVsMK0Nl6A6mEG1rRMyQfQ= X-Received: by 2002:aca:cc0f:: with SMTP id c15mr7804163oig.105.1552025788429; Thu, 07 Mar 2019 22:16:28 -0800 (PST) MIME-Version: 1.0 From: Dan Williams Date: Thu, 7 Mar 2019 22:16:17 -0800 Message-ID: Subject: Hang / zombie process from Xarray page-fault conversion (bisected) To: Matthew Wilcox Cc: Linux MM , linux-nvdimm , linux-fsdevel , "Barror, Robert" Content-Type: text/plain; charset="UTF-8" Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Hi Willy, We're seeing a case where RocksDB hangs and becomes defunct when trying to kill the process. v4.19 succeeds and v4.20 fails. Robert was able to bisect this to commit b15cd800682f "dax: Convert page fault handlers to XArray". I see some direct usage of xa_index and wonder if there are some more pmd fixups to do? Other thoughts?