From owner-freebsd-current@freebsd.org Tue Jun 25 20:16:20 2019 Return-Path: Delivered-To: freebsd-current@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 F1E9D15D641E; Tue, 25 Jun 2019 20:16:19 +0000 (UTC) (envelope-from bu7cher@yandex.ru) Received: from forward103j.mail.yandex.net (forward103j.mail.yandex.net [IPv6:2a02:6b8:0:801:2::106]) (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 6A8D67431B; Tue, 25 Jun 2019 20:16:19 +0000 (UTC) (envelope-from bu7cher@yandex.ru) Received: from mxback9g.mail.yandex.net (mxback9g.mail.yandex.net [IPv6:2a02:6b8:0:1472:2741:0:8b7:170]) by forward103j.mail.yandex.net (Yandex) with ESMTP id B77A46740A91; Tue, 25 Jun 2019 23:16:07 +0300 (MSK) Received: from smtp3o.mail.yandex.net (smtp3o.mail.yandex.net [2a02:6b8:0:1a2d::27]) by mxback9g.mail.yandex.net (nwsmtp/Yandex) with ESMTP id Xqg9DHKJZs-G7QqnDRm; Tue, 25 Jun 2019 23:16:07 +0300 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex.ru; s=mail; t=1561493767; bh=gOpmhW4/E+iK7AQqJR03/vZBnp8xaMqwwl75S2GLFRE=; h=In-Reply-To:From:To:Subject:Cc:Date:References:Message-ID; b=qRtR31NFc7PRWca+5Xb5wxMgSL/KoqpEzRb/oVdJyomVGtaGMUo4AZxw6tl9XLdgO 4lmZm9kaADzQUOpAD5YwQAe/X06VpvBqfX8sYmkEvv/uYroj8k+jVHBuWyzEI8vvIl tN4hxmITgo6oa1byyNYf+6in+Yx6YK2iyHEFvTTg= Received: by smtp3o.mail.yandex.net (nwsmtp/Yandex) with ESMTPSA id BbzteSheyk-G6mGf6BX; Tue, 25 Jun 2019 23:16:06 +0300 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (Client certificate not present) Subject: Re: ng_snd_item: Panic? To: Larry Rosenman Cc: freebsd-net@freebsd.org, freebsd-current@freebsd.org References: <20190624183200.hu4vzocjsopjsnnz@ler-imac.local> From: "Andrey V. Elsukov" Openpgp: id=E6591E1B41DA1516F0C9BC0001C5EA0410C8A17A Autocrypt: addr=bu7cher@yandex.ru; prefer-encrypt=mutual; keydata= mQENBEwBF1kBCADB9sXFhBEUy8qQ4X63Y8eBatYMHGEFWN9ypS5lI3RE6qQW2EYbxNk7qUC5 21YIIS1mMFVBEfvR7J9uc7yaYgFCEb6Sce1RSO4ULN2mRKGHP3/Sl0ijZEjWHV91hY1YTHEF ZW/0GYinDf56sYpDDehaBF5wkWIo1+QK5nmj3vl0DIDCMNd7QEiWpyLVwECgLX2eOAXByT8B bCqVhJGcG6iFP7/B9Ll6uX5gb8thM9LM+ibwErDBVDGiOgvfxqidab7fdkh893IBCXa82H9N CNwnEtcgzh+BSKK5BgvPohFMgRwjti37TSxwLu63QejRGbZWSz3OK3jMOoF63tCgn7FvABEB AAG0JUFuZHJleSBWLiBFbHN1a292IDxidTdjaGVyQHlhbmRleC5ydT6JATgEEwECACIFAkwB F1kCGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEAHF6gQQyKF6qmYIAI6ekfm1VA4T vqankI1ISE6ku4jV7UlpIQlEbE7/8n3Zd6teJ+pGOQhN5qk8QE7utdPdbktAzi+x7LIJVzUw 4TywZLXGrkP7VKYkfg6oyCGyzITghefQeJtr2TN4hYCkzPWpylkue8MtmqfZv/6royqwTbN+ +E09FQNvTgRUYJYTeQ1qOsxNRycwvw3dr2rOfuxShbzaHBB1pBIjGrMg8fC5pd65ACH5zuFV A0CoTNGMDrEZSfBkTW604UUHFFXeCoC3dwDZRKOWJ3GmMXns65Ai5YkA63BSHEE1Qle3VBhd cG1w0CB5FBV3pB27UVnf0jEbysrDqW4qN7XMRFSWNAy5AQ0ETAEXWQEIAJ2p6l9LBoqdH/0J PEFDY2t2gTvAuzz+8zs3R03dFuHcNbOwjvWCG0aOmVpAzkRa8egn5JB4sZaFUtKPYJEQ1Iu+ LUBwgvtXf4vWpzC67zs2dDuiW4LamH5p6xkTD61aHR7mCB3bg2TUjrDWn2Jt44cvoYxj3dz4 S49U1rc9ZPgD5axCNv45j72tggWlZvpefThP7xT1OlNTUqye2gAwQravXpZkl5JG4eOqJVIU X316iE3qso0iXRUtO7OseBf0PiVmk+wCahdreHOeOxK5jMhYkPKVn7z1sZiB7W2H2TojbmcK HZC22sz7Z/H36Lhg1+/RCnGzdEcjGc8oFHXHCxUAEQEAAYkBHwQYAQIACQUCTAEXWQIbDAAK CRABxeoEEMihegkYCAC3ivGYNe2taNm/4Nx5GPdzuaAJGKWksV+w9mo7dQvU+NmI2az5w8vw 98OmX7G0OV9snxMW+6cyNqBrVFTu33VVNzz9pnqNCHxGvj5dL5ltP160JV2zw2bUwJBYsgYQ WfyJJIM7l3gv5ZS3DGqaGIm9gOK1ANxfrR5PgPzvI9VxDhlr2juEVMZYAqPLEJe+SSxbwLoz BcFCNdDAyXcaAzXsx/E02YWm1hIWNRxanAe7Vlg7OL+gvLpdtrYCMg28PNqKNyrQ87LQ49O9 50IIZDOtNFeR0FGucjcLPdS9PiEqCoH7/waJxWp6ydJ+g4OYRBYNM0EmMgy1N85JJrV1mi5i Message-ID: <7b4c697c-e924-deb8-d227-2d188b8f8483@yandex.ru> Date: Tue, 25 Jun 2019 23:13:29 +0300 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="pkXM9hOnC7Epjpsk1PDXC3jciX3wIAszu" X-Rspamd-Queue-Id: 6A8D67431B X-Spamd-Bar: ------ Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-6.98 / 15.00]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; NEURAL_HAM_SHORT(-0.98)[-0.981,0]; REPLY(-4.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0] X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Jun 2019 20:16:20 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --pkXM9hOnC7Epjpsk1PDXC3jciX3wIAszu Content-Type: multipart/mixed; boundary="LAsyanrEHoxlPz6O4Ca6I4nKHVYwDfizP"; protected-headers="v1" From: "Andrey V. Elsukov" To: Larry Rosenman Cc: freebsd-net@freebsd.org, freebsd-current@freebsd.org Message-ID: <7b4c697c-e924-deb8-d227-2d188b8f8483@yandex.ru> Subject: Re: ng_snd_item: Panic? References: <20190624183200.hu4vzocjsopjsnnz@ler-imac.local> In-Reply-To: --LAsyanrEHoxlPz6O4Ca6I4nKHVYwDfizP Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 25.06.2019 15:59, Larry Rosenman wrote: > On 06/25/2019 4:18 am, Andrey V. Elsukov wrote: >> On 24.06.2019 23:10, Larry Rosenman wrote: >>>>> #5=C2=A0 0xffffffff828ee5b7 in ng_snd_item (item=3D0xfffff8021e3b4d= 80, >>>>> flags=3D0) >>>>> =C2=A0=C2=A0=C2=A0 at /usr/src/sys/netgraph/ng_base.c:2252 >>>> >>>> It looks like you use some netgraph based ethernet interface. >>>> The system got received ARP request and is going to send the reply, >>>> but somehow mbuf with this ARP request has initialized m_next pointe= r, >>>> thus it is considered as a chain of mbufs. >>>> >>>> in_arpinput() reuses received mbuf to construct the reply, but it >>>> doesn't check that an mbut is a chain. It just sets m_len and sends = it. >>>> Then since you have INVARIANTS in your kernel, the netgraph code che= ck >>>> the actual length of the chain, and it doesn't match to m_len. It >>>> panics. >>> >>> >>> so, is this a bug?=C2=A0 Timing race? Other? >> >> I think we should determine that my assumption is correct :) >> Can you show the output of the following commands from the kgdb for th= is >> core? >> >> (kgdb) f 7 >> (kgdb) p *m >> (kgdb) p *m->m_next >=20 >=20 > (kgdb) fr 7 > #7=C2=A0 0xffffffff805b1e43 in ether_output (ifp=3D, > m=3D0xfffff81f59eefb00, dst=3D0xfffffe012628d740, ro=3D)= at > /usr/src/sys/net/if_ethersubr.c:430 > 430=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 i= f ((error =3D (*ng_ether_output_p)(ifp, &m)) !=3D 0) { I failed to track the possible way to get this. Please, show the output of the following commands: (kgdb) f 7 (kgdb) p/x (u_char[42])m->m_data (kgdb) p/x (u_char[1372]m->m_next->m_data Did you used this configuration for the long time and these panics were the first time? --=20 WBR, Andrey V. Elsukov --LAsyanrEHoxlPz6O4Ca6I4nKHVYwDfizP-- --pkXM9hOnC7Epjpsk1PDXC3jciX3wIAszu Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Comment: Using GnuPG with Thunderbird - https://www.enigmail.net/ iQEzBAEBCAAdFiEE5lkeG0HaFRbwybwAAcXqBBDIoXoFAl0SgGkACgkQAcXqBBDI oXobnwgAu+qATxqLM5x9lj50JU7DtSD++QN++XiKTTdv2o/Ihai26OnW5EDRrfzh GcefzF47UvJTsBhf48y9Ws6XoMLShCv6FWE6iP5b2B7KwQ8rYVbpu5eNfQOqamqd lIX0j1q+xvqs+mx5F5XvC3QWNu1+lS1Pdgw3ay7i8qNfBTDJHg6NeUcA2uTz/iVX eiG3pkXigTTnLIquPmg9OpHUgZWAmpzFAvl36aoWfzVKUBxYS8CVYnYwAngUf4UR 3xIBvy0UyuWbX/7xyHJzF6PdUA77M6Mm7ti5Qly2x28SDDL3Jl4jglmzX4sQ7TdY ZwJuHwKTvpCucy1OXx4/73SI3A2pyA== =Y/JP -----END PGP SIGNATURE----- --pkXM9hOnC7Epjpsk1PDXC3jciX3wIAszu--