From owner-svn-src-head@freebsd.org Sun Oct 1 21:20:30 2017 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 086E2E2ED6D; Sun, 1 Oct 2017 21:20:30 +0000 (UTC) (envelope-from jch@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 mx1.freebsd.org (Postfix) with ESMTPS id C9F396F869; Sun, 1 Oct 2017 21:20:29 +0000 (UTC) (envelope-from jch@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v91LKS0o050146; Sun, 1 Oct 2017 21:20:28 GMT (envelope-from jch@FreeBSD.org) Received: (from jch@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id v91LKSH1050145; Sun, 1 Oct 2017 21:20:28 GMT (envelope-from jch@FreeBSD.org) Message-Id: <201710012120.v91LKSH1050145@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: jch set sender to jch@FreeBSD.org using -f From: Julien Charbon Date: Sun, 1 Oct 2017 21:20:28 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r324179 - head/sys/netinet X-SVN-Group: head X-SVN-Commit-Author: jch X-SVN-Commit-Paths: head/sys/netinet X-SVN-Commit-Revision: 324179 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 01 Oct 2017 21:20:30 -0000 Author: jch Date: Sun Oct 1 21:20:28 2017 New Revision: 324179 URL: https://svnweb.freebsd.org/changeset/base/324179 Log: Fix an infinite loop in tcp_tw_2msl_scan() when an INP_TIMEWAIT inp has been destroyed before its tcptw with INVARIANTS undefined. This is a symmetric change of r307551: A INP_TIMEWAIT inp should not be destroyed before its tcptw, and INVARIANTS will catch this case. If INVARIANTS is undefined it will emit a log(LOG_ERR) and avoid a hard to debug infinite loop in tcp_tw_2msl_scan(). Reported by: Ben Rubson, hselasky Submitted by: hselasky Tested by: Ben Rubson, jch MFC after: 1 week Sponsored by: Verisign, inc Differential Revision: https://reviews.freebsd.org/D12267 Modified: head/sys/netinet/tcp_timewait.c Modified: head/sys/netinet/tcp_timewait.c ============================================================================== --- head/sys/netinet/tcp_timewait.c Sun Oct 1 20:12:30 2017 (r324178) +++ head/sys/netinet/tcp_timewait.c Sun Oct 1 21:20:28 2017 (r324179) @@ -709,10 +709,29 @@ tcp_tw_2msl_scan(int reuse) INP_WLOCK(inp); tw = intotw(inp); if (in_pcbrele_wlocked(inp)) { - KASSERT(tw == NULL, ("%s: held last inp " - "reference but tw not NULL", __func__)); - INP_INFO_RUNLOCK(&V_tcbinfo); - continue; + if (__predict_true(tw == NULL)) { + INP_INFO_RUNLOCK(&V_tcbinfo); + continue; + } else { + /* This should not happen as in TIMEWAIT + * state the inp should not be destroyed + * before its tcptw. If INVARIANTS is + * defined panic. + */ +#ifdef INVARIANTS + panic("%s: Panic before an infinite " + "loop: INP_TIMEWAIT && (INP_FREED " + "|| inp last reference) && tw != " + "NULL", __func__); +#else + log(LOG_ERR, "%s: Avoid an infinite " + "loop: INP_TIMEWAIT && (INP_FREED " + "|| inp last reference) && tw != " + "NULL", __func__); +#endif + INP_INFO_RUNLOCK(&V_tcbinfo); + break; + } } if (tw == NULL) {