From owner-freebsd-net@freebsd.org Fri Jun 19 17:49:07 2020 Return-Path: Delivered-To: freebsd-net@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 29C663343A2 for ; Fri, 19 Jun 2020 17:49:07 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.nyi.freebsd.org (unknown [127.0.1.3]) by mx1.freebsd.org (Postfix) with ESMTP id 49pRBW0NpKz4YYP for ; Fri, 19 Jun 2020 17:49:07 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.nyi.freebsd.org (Postfix) id 0BA3A3343A1; Fri, 19 Jun 2020 17:49:07 +0000 (UTC) Delivered-To: net@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 0B69D33441D for ; Fri, 19 Jun 2020 17:49:07 +0000 (UTC) (envelope-from bugzilla-noreply@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 49pRBV6RQrz4YBv for ; Fri, 19 Jun 2020 17:49:06 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (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 did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id D415F1EB75 for ; Fri, 19 Jun 2020 17:49:06 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 05JHn6Eo017620 for ; Fri, 19 Jun 2020 17:49:06 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 05JHn605017619 for net@FreeBSD.org; Fri, 19 Jun 2020 17:49:06 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 246819] Kernel panic with ifconfig destroy Date: Fri, 19 Jun 2020 17:49:07 +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: panic X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: markj@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: bug_status cc 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: 2.1.33 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 Jun 2020 17:49:07 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D246819 Mark Johnston changed: What |Removed |Added ---------------------------------------------------------------------------- Status|New |Open CC| |markj@FreeBSD.org --- Comment #3 from Mark Johnston --- (In reply to Ashish Gupta from comment #2) Looks like we are panicking because the counters in the in6_ifstat block are freed. In particular, the panic happens while executing: 790 in6_ifstat_inc(ifp, ifs6_out_request); which expands to 545 #define in6_ifstat_inc(ifp, tag) \=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20 546 do { \=20=20= =20=20=20=20=20=20=20=20=20 547 if (ifp) \=20=20= =20=20=20=20=20=20=20=20=20 548 counter_u64_add(((struct in6_ifextra *) \=20=20= =20=20=20=20=20=20=20=20=20 549 ((ifp)->if_afdata[AF_INET6]))->in6_ifstat[ \=20=20= =20=20=20=20=20=20=20=20=20 550 offsetof(struct in6_ifstat, tag) / sizeof(uint64_t)= ], 1);\=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20 551 } while (/*CONSTCOND*/ 0) and the fault address is 0, so it shouldn't be from the if_afdata dereferen= ce or the in6_ifstat dereference (since ifs6_out_request is not the first coun= ter in the block). So the interface is already destroyed, but we are sending TCP keepalives through it. --=20 You are receiving this mail because: You are the assignee for the bug.=