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[94.79.142.242]) by smtp.gmail.com with ESMTPSA id 32sm5786456wra.35.2019.06.21.10.48.56 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 21 Jun 2019 10:48:56 -0700 (PDT) To: linux-nfs@vger.kernel.org From: Daniel Kobras Subject: Backport of "false retries" patch? Openpgp: preference=signencrypt Autocrypt: addr=kobras@puzzle-itc.de; keydata= mQGNBFuyIr8BDADfcwWSZafsIOyivFu+Bh3ynelaKS35BuF43EfZmmCmAKzpVrkqo0vYpWb+ GKn8wyyy+Z89BGvWjMmGQ5tUzIF+2cGgc3SoAeqSOY0CkUPC6ea0rKA/02LiEJR3ScUx5QU9 uz5H0Y7Xcj0MnqLFw6poZmZqVJ6i0YYNYB0/vtrsmZgRdbkCxq+PINdnCAva9ROkiOwW6iyy nmejJETfsy5wIuiVPJ/SyTtnQuBgGvESVzW46JRZS8+aD9PLip/nn0buJCQHZADswMnn62vV 3fNDCnPFo3z5c//jKm+0MesGEBNtdNdHdLyQy9HizvCE7zpV4HVhDGo8FV9JHReWRb4zv7Cc 6Ro3kKP7XTdEs1/qxxMtJakW+VY19tS+qFR9C4+PoaeK0/RS7GeI5SMxTHVI2xCkMwG1nNWB aZ14XDH1ieXjqQKQr/TCcNbfeZAXO021oqhUN6YKH0H6Iywu7Mos9syqCxFZ6KRYhKaZgJzP Jlb6iTcDyFZRbRldOnQiKkEAEQEAAbQxRGFuaWVsIEtvYnJhcyAoUHV6emxlIElUQykgPGtv YnJhc0BwdXp6bGUtaXRjLmRlPokBzgQTAQoAOBYhBM3oc+2tF4TjZ5+mipqV0zLLbB3XBQJb siK/AhsDBQsJCAcCBhUKCQgLAgQWAgMBAh4BAheAAAoJEJqV0zLLbB3XE1kMAIlngQYG6ufb sSPWbK+mqb9cvYkJrQkgdyNNMHd48MVBWMBq89ycfVnQi0DOzRNqXl6sX/dZQnb/ThWEDoFW wvKee2onXGGYVrAf3p1RRFxO1laKXeSECSJE4bru0Lo/mU4tnxOAa+3ugirgIpgvw19zN/Ic P9nnlFFyFoLecnc/jUN7BCNmCpjYsregRoKRBT68FGISFEwot2ut4IvP1u6V01JcMpDTtLKs u3QxbIkfkVIoyfVGZjWbFhtzl8qRE6Ug7esUHsBEsjvpb5OE9XCwHACn3c8yScKk7xI9dpXt bxIIokCJHMZBxO1Q7CUuGYGtAgb2k++/Wh5FxqDTkVglf2UH0nN5B03Sike8TDmZwW59iTiV r8sBAsKDizSzTzOESi7f3lcG90anNHf8oLBeMfzfUQZNypneZ/8R7CKzr6msICKhqrR8F9Ed 889RusI3CPb10OLDRBW4d19nTC5Hyvk4+7vtcenY8g5hGeqLHUgGn28rcK+qkjKr922HU7kB jQRbsiK/AQwAxUDhTjEPV9kluZ/Mo/B7Sq8D2aGzfiTQm1c2t5I8BrCbOIQr+t5p1i6wsbUw SXahmnHzqUSdLs62aT+i25RsUBMpplYepG66zT5q+7YoBzsh6Sl4zchVTAsDSpUhGFkSZ9mh 53G9Y3hbv36ROIYJOisWx8KdCG/HFjC8GaWDT5vgvUUL8u90qDXaot5VZXz5RP8+Y2LAfs1R Ys/9vd9R+93rDLfceDxDjWiXgUXMhywB8ZzC8ulEwWkzFniWQA09g1+w/9/zhTxD/obCCqQW cFhPvZAM7GV4Shx8VhKrsSqwZufVY0d6oA5rB16j/o2lw/2SMOVyZodj8ErwMTYsWsIUt4iG XEu0STSrihGz59YimfdHxKg9sFgwD43JcM3+2pXRSE3Q4oazr3TnyIT/dtlNbjtQOjT7apy9 xZG7kjjvbxjWBkdbmNCNG4te+ueT4Hi/HF5Yw/0xNeOq4WtAT8nGxOLVGLToqugb2P6nKXjF 0BDJu8S42/jSw4XByNsHABEBAAGJAbYEGAEKACAWIQTN6HPtrReE42efpoqaldMyy2wd1wUC W7IivwIbDAAKCRCaldMyy2wd12i4DACUIrpZZqCFVD/jngeYexLci/lmNIUh+pnw/1sI15O+ N4T7ISCUGLvO7ZFO1qCcLC/UrYxQD+qgBnmQ9mRHXFSiEXcTLQG9QB8h/uP/2ZqhZVjWLdZS NFVQBct2etq5NB+z484CT5PhYcpHMzWF8DwwoxqlGxd8MRZ4IEu5Gaa8ZYagZQvSRn/82y6j svvBhMidgy6FphmxOwzFgf9EmAToDTJ5Kp5250C/XU9YrPIlg6ALAI5iFlQf5NJIG1dnV3wJ xSUgDrMtHpfzP0eTFskimusVtsZmsA9SRyny1fiySsl9xm6bOtwmfmSgK1pQznTg5mMHKsgy m66zlacn8OBoZ16acBmNGZL2Du5UUlxsFDGgGNdiXwomLkEhtpPJZC4230d2ngQqLzfBA9CH orAjkyCQkC4vNM8gadJcCEmNW8jxQAFAEypFu9JewCA8DiPOIU2xPw27ocZVPuRQIwiAuF3Z p63U1j1sBdH4lyrWIu/HHjYDEL8+XTvqMCBEHuI= Organization: Puzzle ITC Deutschland GmbH Message-ID: Date: Fri, 21 Jun 2019 19:48:55 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Language: en-US Content-Transfer-Encoding: quoted-printable Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org Hi! Debugging a long-standing NFS problem that kept causing application stalls and required frequent server reboots, we've identified symptoms very similar to what's described in the "false retries" patch in http://git.linux-nfs.org/?p=3Dtrondmy/linux-nfs.git;a=3Dcommit;h=3D3453d570= 8b33efe76f40eca1c0ed60923094b971. Unlike the original report (https://www.spinics.net/lists/linux-nfs/msg71508.html), we've seen this issue trigger with older kernels than 4.20, eg. with Ubuntu's standard and hwe kernels in its LTS releases. Testing now with a vanilla 5.1 kernel that got the patch merged, has been aggravated by an unrelated NFS regression (https://lkml.org/lkml/2019/5/29/772) and is therefore still ongoing, but looks promising so far. As far as I can tell, the patch has only been merged for 5.1 and up. Given that the bug seems to affect more systems than originally reported, would you deem it appropriate for inclusion into some of the older -stable trees? Kind regards, Daniel --=20 Daniel Kobras Principal Architect Puzzle ITC Deutschland +49 7071 14316 0 www.puzzle-itc.de --=20 Puzzle ITC Deutschland GmbH Sitz der Gesellschaft: Jurastr. 27/1, 72072=20 T=C3=BCbingen Eingetragen am Amtsgericht Stuttgart HRB 765802 Gesch=C3=A4ftsf=C3=BChrer:=20 Lukas Kallies, Daniel Kobras, Mark Pr=C3=B6hl