From nobody Mon Oct 11 12:44:27 2021 X-Original-To: bugs@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 3493917AB97B for ; Mon, 11 Oct 2021 12:44:27 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4HSdlv0xl9z4h0s for ; Mon, 11 Oct 2021 12:44:27 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 0163A20CEE for ; Mon, 11 Oct 2021 12:44:27 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 19BCiQvs069413 for ; Mon, 11 Oct 2021 12:44:26 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 19BCiQrV069411 for bugs@FreeBSD.org; Mon, 11 Oct 2021 12:44:26 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 259071] Read reports wrong number of bytes on a network filesystem. Date: Mon, 11 Oct 2021 12:44:27 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: CURRENT X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: chogata@moosefs.pro X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter attachments.mimetype attachments.created Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: Bug reports List-Archive: https://lists.freebsd.org/archives/freebsd-bugs List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-bugs@freebsd.org MIME-Version: 1.0 X-ThisMailContainsUnwantedMimeParts: N https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D259071 Bug ID: 259071 Summary: Read reports wrong number of bytes on a network filesystem. Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: chogata@moosefs.pro Attachment #228584 text/plain mime type: Created attachment 228584 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D228584&action= =3Dedit Simple file ops program In connection with bug #256937, bug #256936 and reports from MooseFS users (that complain, that with large source trees "git clone" operation often fa= ils on MooseFS, when client/mount is on FreeBSD) we developed a program, that s= hows a basic problem with FreeBSD kernel.=20 It's a simple program, that creates 2 processes. The main process continuou= sly performs 3 operations on a file, at random: read, write or ftruncate. The c= hild process performs stat operation on the same file. If the program is run on a local filesystem on FreeBSD, it works. If it is = run on any fusefs (SSHfs, MooseFS) or even on NFS, at some point (usually under= 1 minute) the read operation will return wrong number of bytes. No "networkin= g" necessary - all modifications and reads from file happen on one mountpoint. The same program will run on Linux on any kind of fs (local, nfs, fusefs) w= ith no problems. I'm attaching the program. The steps to repeat are simple: install FreeBSD = (13 or 14, but with patch from bug #256937, otherwise you will experience kernel panics), compile the program and run it on selected filesystems, wait for results. --=20 You are receiving this mail because: You are the assignee for the bug.=