From owner-freebsd-net@freebsd.org Wed Nov 28 08:54:01 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 149CC114CE15 for ; Wed, 28 Nov 2018 08:54:01 +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 8C83769B7F for ; Wed, 28 Nov 2018 08:54:00 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.ysv.freebsd.org (Postfix) id 4FC98114CE14; Wed, 28 Nov 2018 08:54:00 +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 2A67C114CE12 for ; Wed, 28 Nov 2018 08:54:00 +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 TLSv1.3 with cipher TLS_AES_256_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 9E10769B77 for ; Wed, 28 Nov 2018 08:53:59 +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 D19D713E23 for ; Wed, 28 Nov 2018 08:53:58 +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 wAS8rw93098508 for ; Wed, 28 Nov 2018 08:53:58 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id wAS8rwsw098507 for net@FreeBSD.org; Wed, 28 Nov 2018 08:53:58 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 230498] Fatal trap 12: page fault while in kernel mode in sysctl_dumpentry from sysctl NET_RT_DUMP Date: Wed, 28 Nov 2018 08:53:58 +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: 11.2-STABLE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: Franck.Rousseau@imag.fr X-Bugzilla-Status: New 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-Rspamd-Queue-Id: 8C83769B7F X-Spamd-Result: default: False [2.21 / 15.00]; local_wl_from(0.00)[freebsd.org]; NEURAL_SPAM_LONG(0.62)[0.618,0]; NEURAL_SPAM_MEDIUM(0.71)[0.707,0]; ASN(0.00)[asn:10310, ipnet:2001:1900:2254::/48, country:US]; NEURAL_SPAM_SHORT(0.88)[0.885,0] X-Rspamd-Server: mx1.freebsd.org X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Nov 2018 08:54:01 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D230498 --- Comment #20 from Franck Rousseau --- (In reply to commit-hook from comment #19) As mentioned in comment #9 above, this patch breaks ppp, I get this when tr= ying to re-open a second connection, this is the stage at which the crash occured before: PPp ON localhost> Warning: iface add: ioctl(SIOCAIFADDR, 192.168.0.2 -> 192.168.0.1): File exists Error: ipcp_InterfaceUp: unable to set ip address Also, the patch in attachment #199450 does not fix this specific problem, we still crash the kernel with the procedure described earlier in comment #12.= As I said, I could narrow down the cause and find a fix for our use case, by u= sing two different IPv4 addresses for Ethernet and PPP tun interfaces the kernel does not crash anymore. About the fix, I suspect that internal structures are corrupted, so any kin= d of fix at this point will fail, for example with this patch on 11.2-p4 it looks like I keep getting these values after the crash: (kgdb) print rt->rt_ifp->if_flags $3 =3D 3 (kgdb) print rt->rt_ifp->if_index $4 =3D 63488 I will try to setup on-line debugging to watch internal structures and see = if I can get an idea of what is breaking things up. --=20 You are receiving this mail because: You are the assignee for the bug.=