From owner-freebsd-net@freebsd.org Mon May 14 14:46:31 2018 Return-Path: Delivered-To: freebsd-net@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 4BF7EDF3141 for ; Mon, 14 May 2018 14:46:31 +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 B8A6A6C879 for ; Mon, 14 May 2018 14:46:30 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.ysv.freebsd.org (Postfix) id 6C36FDF3140; Mon, 14 May 2018 14:46:30 +0000 (UTC) Delivered-To: net@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 463ADDF313C for ; Mon, 14 May 2018 14:46:30 +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 D5BC76C858 for ; Mon, 14 May 2018 14:46:29 +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 1DAA6CC72 for ; Mon, 14 May 2018 14:46:29 +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 w4EEkSbO046605 for ; Mon, 14 May 2018 14:46:28 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id w4EEkSPs046604 for net@FreeBSD.org; Mon, 14 May 2018 14:46:28 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: net@FreeBSD.org Subject: [Bug 227720] Kernel panic in ppp server Date: Mon, 14 May 2018 14:46:29 +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: 11.1-RELEASE X-Bugzilla-Keywords: crash, needs-qa X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: eugen@freebsd.org X-Bugzilla-Status: Open X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: net@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: 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-net@freebsd.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 14 May 2018 14:46:31 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D227720 --- Comment #14 from Eugene Grosbein --- I've downloaded it, thanks. (kgdb) p *((struct rtentry *)rn)->rt_ifp $7 =3D {if_link =3D {tqe_next =3D 0xdeadc0dedeadc0de, tqe_prev =3D 0xdeadc0= dedeadc0de}, if_clones =3D { le_next =3D 0xdeadc0dedeadc0de, le_prev =3D 0xdeadc0dedeadc0de}, if_gro= ups =3D { tqh_first =3D 0xdeadc0dedeadc0de, tqh_last =3D 0xdeadc0dedeadc0de}, if_alloctype =3D 222 '=D1=87', if_softc =3D 0xdeadc0dedeadc0de, if_llsoftc =3D 0xdeadc0dedeadc0de, if_l2= com =3D 0xdeadc0dedeadc0de, if_dname =3D 0xdeadc0dedeadc0de
, etc. This means race condition in the kernel between interface removal procedure when some tunnel is being disconnected and sysctl handler for "net.routetab= le" that ppp calls, or some subroutine this handler uses. Perhaps, this is guilt of sysctl_rtsock() function that uses RIB_RLOCK() be= fore calling rnh->rnh_walktree(&rnh->head, sysctl_dumpentry, &w) but that does n= ot protect from interface destruction: https://svnweb.freebsd.org/base/release/11.1.0/sys/net/rtsock.c?annotate=3D= 321354#l1898 We need some more eyes of networking people here. --=20 You are receiving this mail because: You are the assignee for the bug.=