From owner-freebsd-net@freebsd.org Thu Oct 13 09:12:41 2016 Return-Path: Delivered-To: freebsd-net@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 708ADC10B8D for ; Thu, 13 Oct 2016 09:12:41 +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 mx1.freebsd.org (Postfix) with ESMTPS id 5F397F01 for ; Thu, 13 Oct 2016 09:12:41 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id u9D9CeYu001159 for ; Thu, 13 Oct 2016 09:12:41 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-net@FreeBSD.org Subject: [Bug 148807] [panic] "panic: sbdrop" and "panic: sbsndptr: sockbuf _ and mbuf _ clashing" (8.1-RELEASE/10.1-STABLE/11-CURRENT) Date: Thu, 13 Oct 2016 09:12:40 +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: 10.1-STABLE X-Bugzilla-Keywords: crash, needs-qa, patch X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: slw@zxy.spb.ru X-Bugzilla-Status: Open X-Bugzilla-Resolution: X-Bugzilla-Priority: Normal X-Bugzilla-Assigned-To: freebsd-net@FreeBSD.org X-Bugzilla-Flags: mfc-stable9? mfc-stable10? mfc-stable11? X-Bugzilla-Changed-Fields: 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: 2.1.23 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 13 Oct 2016 09:12:41 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D148807 slw@zxy.spb.ru changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |slw@zxy.spb.ru --- Comment #33 from slw@zxy.spb.ru --- (In reply to Hiren Panchasara from comment #31) > Most interesting frames are these 2: >=20 > #22 0xffffffff80a6c546 in ether_input (ifp=3D, m=3D0x0) at= /d2/hiren/freebsd/sys/net/if_ethersubr.c:759 > #23 0xffffffff804e2b3c in igb_rx_input (rxr=3D, ifp=3D0xff= fff80115614800, m=3D0xfffff8014eee7600,=20 > ptype=3D) at /d2/hiren/freebsd/sys/dev/e1000/if_igb.c:4= 957 > > #23 has an mbuf while #22 has it null. > Does this point to your hunch of > "device-driver bugs involving modifications to the mbuf chain after submi= tting the mbuf to the network stack (e.g., due to concurrency bugs in the d= evice driver)" ? This is just result of compiler optimisation and stack decoding. Compiler use for m same register as passed at call time and do while (m) {=20=20 mn =3D m->m_nextpkt; [...] m =3D mn; } as result m (as decoded argument) will be incorectly displayed. Actualy this is just last loop iteration with last mbuf in chain. --=20 You are receiving this mail because: You are the assignee for the bug.=