From owner-freebsd-net@freebsd.org Tue Jun 25 09:21:31 2019 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 7CC4715C5F8B; Tue, 25 Jun 2019 09:21:31 +0000 (UTC) (envelope-from bu7cher@yandex.ru) Received: from forward105o.mail.yandex.net (forward105o.mail.yandex.net [37.140.190.183]) (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 E9D7A81905; Tue, 25 Jun 2019 09:21:30 +0000 (UTC) (envelope-from bu7cher@yandex.ru) Received: from mxback16o.mail.yandex.net (mxback16o.mail.yandex.net [IPv6:2a02:6b8:0:1a2d::67]) by forward105o.mail.yandex.net (Yandex) with ESMTP id 08CBA4200A09; Tue, 25 Jun 2019 12:21:22 +0300 (MSK) Received: from smtp4j.mail.yandex.net (smtp4j.mail.yandex.net [2a02:6b8:0:1619::15:6]) by mxback16o.mail.yandex.net (nwsmtp/Yandex) with ESMTP id tXibhFlPtL-LF5SZidK; Tue, 25 Jun 2019 12:21:16 +0300 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex.ru; s=mail; t=1561454476; bh=AzlvONpjqDvt2JH3FKZantqe3EqMppf2BlwF/YJzeu8=; h=In-Reply-To:From:To:Subject:Cc:Date:References:Message-ID; b=hBQsjeuZLTOR6DEixKX3FnG3O2rlWf/5znvP987L9116/WuuXdvyC65S36Lh5uU8h 0vmVFCe7It300XcAgObddF7T3Fp3Q792ikxiG/Tno0YaJaYJOi79JjvZ8SNR/nvx55 f6x2Rill/hUVPXNQNg3gxYl+zE4HMCSHenTmlrKw= Received: by smtp4j.mail.yandex.net (nwsmtp/Yandex) with ESMTPSA id 4kYEzVZTel-LER4vPbk; Tue, 25 Jun 2019 12:21:15 +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-current@freebsd.org, freebsd-net@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: Date: Tue, 25 Jun 2019 12:18:43 +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="GTseMcnxxuoYZ926VnWhJq0AiOFNjcq3Z" X-Rspamd-Queue-Id: E9D7A81905 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)[-0.985,0]; REPLY(-4.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0] 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: Tue, 25 Jun 2019 09:21:31 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --GTseMcnxxuoYZ926VnWhJq0AiOFNjcq3Z Content-Type: multipart/mixed; boundary="Gj8DifvlaNd17w6FNJpzqBuXQ23ABTZFQ"; protected-headers="v1" From: "Andrey V. Elsukov" To: Larry Rosenman Cc: freebsd-current@freebsd.org, freebsd-net@freebsd.org Message-ID: Subject: Re: ng_snd_item: Panic? References: <20190624183200.hu4vzocjsopjsnnz@ler-imac.local> In-Reply-To: --Gj8DifvlaNd17w6FNJpzqBuXQ23ABTZFQ Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 24.06.2019 23:10, Larry Rosenman wrote: >>> #5=C2=A0 0xffffffff828ee5b7 in ng_snd_item (item=3D0xfffff8021e3b4d80= , 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 pointer,= >> 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= =2E >> Then since you have INVARIANTS in your kernel, the netgraph code check= >> the actual length of the chain, and it doesn't match to m_len. It pani= cs. >=20 >=20 > 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 this core? (kgdb) f 7 (kgdb) p *m (kgdb) p *m->m_next --=20 WBR, Andrey V. Elsukov --Gj8DifvlaNd17w6FNJpzqBuXQ23ABTZFQ-- --GTseMcnxxuoYZ926VnWhJq0AiOFNjcq3Z 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/ iQEzBAEBCAAdFiEE5lkeG0HaFRbwybwAAcXqBBDIoXoFAl0R5vMACgkQAcXqBBDI oXrI+ggAu+FdQZOmI9Lr1ldSMr3IYofxiPX+e1/nzX3KE8zS++BnV8HUxQB2wAF0 MisTfSFuEO2yT6wZGMSfxdWUWcIiQLTKTSdOi2fjlJaXK1i7JAkVKIw+40Fk1OJo xLP4zfdxDvHaiYe6AImm1UJ6iSv4gQNZihP09W//UKrZg5LM0q5vNKkjMz/lqCHT mQhXuPJLIkAAuZxljdnoFVVz0m4KeOkFFqxlgZMMR5Quuh0P6QJQ5s+Iff4i7Z7/ MTC34e0GivO1Sn1bGnISRTh903YjAKNNgyN9xCA6Rbs5L3gp8aLs8zS5EoARLT1/ qEKo7xQj4bX7ob2221ZqwEMLVJoTlw== =0D0U -----END PGP SIGNATURE----- --GTseMcnxxuoYZ926VnWhJq0AiOFNjcq3Z--