From owner-freebsd-bugs@freebsd.org Sat Apr 14 19:42:48 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 CF78FF94756 for ; Sat, 14 Apr 2018 19:42:47 +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 6C6AC83EFA for ; Sat, 14 Apr 2018 19:42:47 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.ysv.freebsd.org (Postfix) id 306BCF94755; Sat, 14 Apr 2018 19:42:47 +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 1DF52F94754 for ; Sat, 14 Apr 2018 19:42:47 +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 B029883EF4 for ; Sat, 14 Apr 2018 19:42:46 +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 08037256F1 for ; Sat, 14 Apr 2018 19:42:46 +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 w3EJgjmi032130 for ; Sat, 14 Apr 2018 19:42:45 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id w3EJgjDX032129 for bugs@FreeBSD.org; Sat, 14 Apr 2018 19:42:45 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 227285] File descriptor passing does not work reliably on SMP system Date: Sat, 14 Apr 2018 19:42:45 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed 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: jan.kokemueller@gmail.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: attachments.mimetype attachments.created Message-ID: In-Reply-To: References: 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: 2.1.25 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 14 Apr 2018 19:42:48 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D227285 Jan Kokem=C3=BCller changed: What |Removed |Added ---------------------------------------------------------------------------- Attachment #192514|text/x-csrc |text/plain mime type| | --- Comment #6 from Jan Kokem=C3=BCller --- Created attachment 192514 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D192514&action= =3Dedit test program (faster reproduction) Here is a better test program that should uncover the race in a few seconds= at most. Compile with "cc fdpass-race-fast.c -pthread -lnv". I'm spawning anot= her thread that just creates and closes socketpairs. This triggers the unp garb= age collector constantly. I believe the race is in soreceive_generic() in sys/kern/uipc_socket.c. The= "in flight" domain socket is taken off the so_rcv sockbuf, but it is not externalized yet (dom_externalize() hasn't been called). This leads to the = GC thinking that the socket is still "in flight" but it doesn't actually get marked because it is off the so_rcv sockbuf. Now the GC thinks this socket = is unreachable and closes it. --=20 You are receiving this mail because: You are the assignee for the bug.=