From owner-freebsd-bugs@freebsd.org Wed Aug 1 12:37:50 2018 Return-Path: Delivered-To: freebsd-bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 13428105B0A3 for ; Wed, 1 Aug 2018 12:37:50 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org [IPv6:2001:1900:2254:206a::50:5]) by mx1.freebsd.org (Postfix) with ESMTP id 95726721DA for ; Wed, 1 Aug 2018 12:37:49 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.ysv.freebsd.org (Postfix) id 59EF2105B0A2; Wed, 1 Aug 2018 12:37:49 +0000 (UTC) Delivered-To: bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 4884E105B0A1 for ; Wed, 1 Aug 2018 12:37:49 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.ysv.freebsd.org (mxrelay.ysv.freebsd.org [IPv6:2001:1900:2254:206a::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.ysv.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id CE9E7721D9 for ; Wed, 1 Aug 2018 12:37:48 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.ysv.freebsd.org (Postfix) with ESMTPS id 25F0B1B54A for ; Wed, 1 Aug 2018 12:37:48 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id w71Cbm6Y080172 for ; Wed, 1 Aug 2018 12:37:48 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id w71CbmPY080166 for bugs@FreeBSD.org; Wed, 1 Aug 2018 12:37:48 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 230259] [FUSE] [BUG]: File close (release) issue Date: Wed, 01 Aug 2018 12:37:46 +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: 11.1-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: freebsd@moosefs.com 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 bug_file_loc op_sys bug_status bug_severity priority component assigned_to reporter 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 MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 Aug 2018 12:37:50 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D230259 Bug ID: 230259 Summary: [FUSE] [BUG]: File close (release) issue Product: Base System Version: 11.1-RELEASE Hardware: Any URL: https://robo.moosefs.com/support/fuse_helloworld.tgz OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: freebsd@moosefs.com This is one of three issues we detected in FreeBSD FUSE while developing our distributed file system. All four issues can be replicated using this simple test script: https://robo.moosefs.com/support/fuse_helloworld.tgz When an I/O operation (for example read) takes a bit long and the process t= hat performed the read operation is killed (i.e. with 9 signal), kernel does not wait for the operation to complete but immediately sends release. Since FUS= E is multithreaded, one's program can get the release before the read (race condition), effectively ending up reading data from an already closed descriptor into no-longer-existing structures. We handled that issue in our system by making reference counters and delayi= ng release (lots of FreeBSD specific code), but since FUSE behaviour on Linux = is completely different and FUSE was first developed on Linux, we feel some consitency is warranted. Best regards, Peter / MooseFS Team --=20 You are receiving this mail because: You are the assignee for the bug.=