From owner-svn-src-all@freebsd.org Thu May 21 11:14:14 2020 Return-Path: Delivered-To: svn-src-all@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 26AF32CA351; Thu, 21 May 2020 11:14:14 +0000 (UTC) (envelope-from kib@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 "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 49SRpG05v5z4nfG; Thu, 21 May 2020 11:14:14 +0000 (UTC) (envelope-from kib@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id F2CA9C4CD; Thu, 21 May 2020 11:14:13 +0000 (UTC) (envelope-from kib@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 04LBEDRh012488; Thu, 21 May 2020 11:14:13 GMT (envelope-from kib@FreeBSD.org) Received: (from kib@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 04LBEDEf012487; Thu, 21 May 2020 11:14:13 GMT (envelope-from kib@FreeBSD.org) Message-Id: <202005211114.04LBEDEf012487@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: kib set sender to kib@FreeBSD.org using -f From: Konstantin Belousov Date: Thu, 21 May 2020 11:14:13 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r361328 - stable/11/sys/kern X-SVN-Group: stable-11 X-SVN-Commit-Author: kib X-SVN-Commit-Paths: stable/11/sys/kern X-SVN-Commit-Revision: 361328 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 May 2020 11:14:14 -0000 Author: kib Date: Thu May 21 11:14:13 2020 New Revision: 361328 URL: https://svnweb.freebsd.org/changeset/base/361328 Log: MFC r361037, r361056: Fix spurious ENOTCONN from closed unix domain socket other' side. Modified: stable/11/sys/kern/uipc_socket.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/kern/uipc_socket.c ============================================================================== --- stable/11/sys/kern/uipc_socket.c Thu May 21 11:12:27 2020 (r361327) +++ stable/11/sys/kern/uipc_socket.c Thu May 21 11:14:13 2020 (r361328) @@ -1565,8 +1565,9 @@ restart: m = so->so_rcv.sb_mb; goto dontblock; } - if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 && - (so->so_proto->pr_flags & PR_CONNREQUIRED)) { + if ((so->so_state & (SS_ISCONNECTING | SS_ISCONNECTED | + SS_ISDISCONNECTING | SS_ISDISCONNECTED)) == 0 && + (so->so_proto->pr_flags & PR_CONNREQUIRED) != 0) { SOCKBUF_UNLOCK(&so->so_rcv); error = ENOTCONN; goto release; @@ -3516,8 +3517,17 @@ soisdisconnected(struct socket *so) * SOCKBUF_LOCK(&so->so_rcv) are the same. */ SOCKBUF_LOCK(&so->so_rcv); - so->so_state &= ~(SS_ISCONNECTING|SS_ISCONNECTED|SS_ISDISCONNECTING); + + /* + * There is at least one reader of so_state that does not + * acquire socket lock, namely soreceive_generic(). Ensure + * that it never sees all flags that track connection status + * cleared, by ordering the update with a barrier semantic of + * our release thread fence. + */ so->so_state |= SS_ISDISCONNECTED; + atomic_thread_fence_rel(); + so->so_state &= ~(SS_ISCONNECTING|SS_ISCONNECTED|SS_ISDISCONNECTING); socantrcvmore_locked(so); SOCKBUF_LOCK(&so->so_snd); sbdrop_locked(&so->so_snd, sbused(&so->so_snd));