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[209.85.220.41]) by mx.google.com with SMTPS id i1sor3534538oib.156.2019.03.07.22.16.28 for (Google Transport Security); Thu, 07 Mar 2019 22:16:28 -0800 (PST) Received-SPF: pass (google.com: domain of dan.j.williams@intel.com designates 209.85.220.41 as permitted sender) client-ip=209.85.220.41; Authentication-Results: mx.google.com; dkim=pass header.i=@intel-com.20150623.gappssmtp.com header.s=20150623 header.b=G90htT7j; spf=pass (google.com: domain of dan.j.williams@intel.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=dan.j.williams@intel.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com 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-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" X-Bogosity: Ham, tests=bogofilter, spamicity=0.010853, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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?