From owner-freebsd-bugs@FreeBSD.ORG Tue Sep 16 11:22:50 2014 Return-Path: Delivered-To: freebsd-bugs@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 978C396C for ; Tue, 16 Sep 2014 11:22:50 +0000 (UTC) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 7F614D63 for ; Tue, 16 Sep 2014 11:22:50 +0000 (UTC) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.14.9/8.14.9) with ESMTP id s8GBMocU053487 for ; Tue, 16 Sep 2014 11:22:50 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 193681] kernel panic: dhclient NULL pointer in ether_output_frame() when using dummynet at layer2 Date: Tue, 16 Sep 2014 11:22:50 +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: 11.0-CURRENT X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: kate@elide.org X-Bugzilla-Status: Needs Triage X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 Sep 2014 11:22:50 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193681 --- Comment #2 from Kate --- In both cases, I can confirm the presence of dummynet's pipe at layer2 is requisite for producing the symptoms: # # sysctl net.link.ether.ipfw=1 net.link.ether.ipfw: 0 -> 1 # sysctl net.link.bridge.ipfw=1 net.link.bridge.ipfw: 0 -> 1 # # dhclient arge0 DHCPDISCOVER on arge0 to 255.255.255.255 port 67 interval 3 DHCPOFFER from 10.0.0.1 DHCPREQUEST on arge0 to 255.255.255.255 port 67 DHCPACK from 10.0.0.1 bound to 10.0.0.12 -- renewal in 300 seconds. # # # ps auxww|grep dhclient root 281 1.0 3.1 10644 2004 u0 S 7:17PM 0:00.04 grep dhclient root 268 0.0 1.8 10428 1180 - Is 7:16PM 0:00.02 dhclient: arge0 [priv] (dhclient) _dhcp 276 0.0 1.6 10428 1032 - Is 7:16PM 0:00.00 dhclient: arge0 (dhclient) # kill 268 # kill 276 # # ipfw add 100 pipe 1 ip from any to any layer2 00100 pipe 1 ip from any to any layer2 # ipfw pipe 1 config # dhclient arge0 DHCPREQUEST on arge0 to 255.255.255.255 port 67 Trap cause = 2 (TLB miss (load or instr. fetch) - kernel mode) [ thread pid 11 tid 100024 ] Stopped at ether_output_frame+0x50: lw v0,680(s0) db> -- You are receiving this mail because: You are the assignee for the bug.