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Thu, 13 Oct 2016 08:24:15 -0700 (PDT) MIME-Version: 1.0 Received: by 10.12.166.26 with HTTP; Thu, 13 Oct 2016 08:24:14 -0700 (PDT) In-Reply-To: <958e01c2-8459-9614-ddd6-d0953fc86c02@yahoo.com> References: <CAAFYNruF4gFAiTCAhyRUQzcovW2osrKn4ehiuNR0btJCZbnOGg@mail.gmail.com> <57FC859F.5000200@grosbein.net> <CAJajdNUXOrzWDKVmSB1Xm_G6zqBhMsZ2vesDcAw2CPGFBU0xtg@mail.gmail.com> <2033449965.65391.1476244568309@mail.yahoo.com> <a450f0eb-378a-2bd5-2f24-a0eb6b941856@freebsd.org> <86183ea5-5855-5fb3-22f6-d25454859186@yahoo.com> <CACpH0McW4KkDbCnfL4DKc4aQiOhnuMYC0q+8ELJn6dtDs0HW3A@mail.gmail.com> <958e01c2-8459-9614-ddd6-d0953fc86c02@yahoo.com> From: Cassiano Peixoto <peixotocassiano@gmail.com> Date: Thu, 13 Oct 2016 12:24:14 -0300 Message-ID: <CAJajdNXkGBLWsVWJiZZQYo=5vqcFzcYOJv0zVA8vzORexjB91A@mail.gmail.com> Subject: Re: FreeBSD10.3-RELEASE. Kernel panic. To: Donald Baud <donaldbaud@yahoo.com> Cc: "net@freebsd.org" <net@freebsd.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.23 X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org> List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-net>, <mailto:freebsd-net-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net/>; List-Post: <mailto:freebsd-net@freebsd.org> List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help> List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-net>, <mailto:freebsd-net-request@freebsd.org?subject=subscribe> X-List-Received-Date: Thu, 13 Oct 2016 15:24:17 -0000 Hi guys, First of all, thanks to share your thoughts about this issue. I think it=E2= =80=99s really important to find out a solution for this issue together. I can see two behaviors related, but for me the root cause is the same: 1- mpd5 process stuck with umtxn flag 2- system crash I=E2=80=99ve tested recently on FreeBSD 10.3 and FreeBSD-11-RC3. I=E2=80=99= ve tried all suggested tunings with no success. My environment is: - About 430 clients connected (but i can add more) - Using ZFS - igb NICs. - Generic kernel Two days ago i updated my system to FreeBSD 11-RELEASE-p1 and after this my system seems stable for almost 3 days. No crashes anymore. I need more days to feel confident if something has changed. But anyway, my crashes before happened every day. If it crashs again i=E2=80=99ll apply Donald recommendation and let you guy= s know. Let=E2=80=99s keep in touch, to try to at last fix it. Thanks. On Wed, Oct 12, 2016 at 8:24 PM, Donald Baud via freebsd-net < freebsd-net@freebsd.org> wrote: > On 10/12/16 3:24 PM, Zaphod Beeblebrox wrote: > > While my mp5 servers are possibly less busy (I havn't had common crashes)= , >> I have noticed a "group" of problems. >> >> 1. The carrier dropping communication (ie: fiber cut or l2 switch >> breakage) of the L2TP streams can leave mpd5 in a state where it will no= t >> die and will not destroy interfaces (requires reboot to clear). >> > I've encountered that once on 10.3 and I had tweaked some sysctl values > while monitoring : > > vmstat -z | head -1; vmstat -z | grep -i netgraph > > you might want to search other people's experience with the following > values: > # net.graph.maxdgram #this is set in /etc/sysctl.conf > # net.graph.recvspace #this is set in /etc/sysctl.conf > # net.graph.maxdata #this is set in /boot/loader.conf > # net.graph.maxalloc #this is set in /boot/loader.conf > > I'll leave others to comment on what's best to set as values with their > experience on FreeBSD10.3. > In my case, as I had explained, one of the recipes that worked for me is > to comment out and leave those kernel values to their default. > > I've read in mpd5 mailing list some saying that FreeBSD-11 have had > upgrades on the netgraph modules. > I am now using FreeBSD-11 and It looks like I don't need any of the kerne= l > tweaks that I've described. > > Also, may I suggest you troubleshoot the fiber-cut or L2 switch breakage > by playing with some ipfw values to simulate a fiber-cut.: > ex: ipfw add 100 deny ip from 10.10.10.10 to me > >> 2. There are race conditions between quagga and mpd5 for adding/dropping >> routes. >> > While troubleshooting the crashes of the mpd5, I have removed net/quagga > and installed net/bird instead. > I am now using net/bird I've written a little howto to get you started > with net/bird > see: https://forums.freebsd.org/threads/56988/ > > 3. if A is a pppoe client and B is the mpd5 server, A cannot access TCP >> services on B. It can access tcp services _beyond_ B, but not on B. (th= ere >> is a ticket open for this). >> >> On Wed, Oct 12, 2016 at 10:51 AM, Donald Baud via freebsd-net < >> freebsd-net@freebsd.org <mailto:freebsd-net@freebsd.org>> wrote: >> >> >> On 10/12/16 1:13 AM, Julian Elischer wrote: >> >> On 11/10/2016 8:56 PM, Donald Baud via freebsd-net wrote: >> >> I've been plagued with these =3Ddaily=3D panics until I trie= d >> the following recipes and the server has been up for 30 >> days so far: >> >> Normally I should expermient more to see which one of the >> receipes is really the fix, but I'm just glad that the >> server is stable for now. >> >> >> this is really great information. >> It makes debugging a lot more possible. >> I know it is a hard question, but do you have a way to >> simulate this workload? >> >> I have no real way to simulate this kind of workload >> >> >> Sadly, I don't have a way to simulate the workload but I am very >> interested to help fix these crashes since as Cassiano said, this >> makes mpd5/freebsd useless for pppoe/l2tp termination. >> >> At this point, I would suggest that Cassiano and =D0=90=D0=BD=D0=B4= =D1=80=D0=B5=D0=B9 confirm >> that they don't get panics when they apply the recipes that I am >> using. >> >> I am still running many other cisco-vpdn gateways that I would >> convert into mpd5/freebsd but my plan was stalled with the daily >> crashes. >> I'll wait a couple of weeks to be sure that my recipes are a valid >> workaround before converting my remaining cisco gateways to mpd5. >> >> -Dbaud >> >> >> >> recipe-1: Don't let mpd5 start automatically when server >> boots: >> i.e. in: /etc/rc.conf >> mpd5_enable=3D"NO" >> and wait about 5 minutes after server boots then issue: >> /usr/local/etc/rc.d/mpd5 onestart >> >> >> recipe-2: recompile the kernel with the NETGRAPH_DEBUG optio= n: >> options NETGRAPH >> options NETGRAPH_DEBUG >> options NETGRAPH_KSOCKET >> options NETGRAPH_L2TP >> options NETGRAPH_SOCKET >> options NETGRAPH_TEE >> options NETGRAPH_VJC >> options NETGRAPH_PPP >> options NETGRAPH_IFACE >> options NETGRAPH_MPPC_COMPRESSION >> options NETGRAPH_MPPC_ENCRYPTION >> options NETGRAPH_TCPMSS >> options IPFIREWALL >> >> recipe-3: recompile the kernel and disable the IPv6 and >> SCTP options: >> nooptions INET6 >> nooptions SCTP >> >> recipe-4: Don't use any of the sysctl optimizations >> in other words I commented out all values in sysctl.conf: >> # net.graph.maxdgram=3D20480 (this is the default) >> # net.graph.recvspace=3D20480 (this is the default) >> >> recipe-5: Don't use any of the loader.conf optimizations >> in other words I commented out all values in loader.conf >> # net.graph.maxdata=3D4096 (this is the default) >> # net.graph.maxalloc=3D4096 (this is the default) >> >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >> In my case, I had the panics with 10.3 and 11-PRERELEASE >> 11.0-PRERELEASE FreeBSD 11.0-PRERELEASE #2 r305587 >> >> With those recipes, I have been running without any crash >> for a month and counting. Thats' 300 l2tp tunnels and >> 1400 l2tp sessions generating 700Mbit/s. >> >> >> -DBaud >> >> >> On Tuesday, October 11, 2016 7:30 AM, Cassiano Peixoto >> <peixotocassiano@gmail.com >> <mailto:peixotocassiano@gmail.com>> wrote: >> Hi, >> >> There are many users complaining about this: >> >> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D186114 >> <https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D186114>; >> >> I've been dealing with this issue for one year with no >> solution. mpd5 as >> pppoe server on FreeBSD is useless with this bug. >> >> I really would like to see it working again, i think it's >> quite important >> to both project and many users. >> >> Thanks. >> >> On Tue, Oct 11, 2016 at 3:24 AM, Eugene Grosbein >> <eugen@grosbein.net <mailto:eugen@grosbein.net>> wrote: >> >> 11.10.2016 11:02, =D0=90=D0=BD=D0=B4=D1=80=D0=B5=D0=B9 = =D0=9B=D0=B5=D1=83=D1=88=D0=BA=D0=B8=D0=BD =D0=BF=D0=B8=D1=88=D0=B5=D1=82: >> >> Hello. I have problem with "FreeBSD nas >> 10.3-RELEASE FreeBSD 10.3-RELEASE >> #0: Fri Oct 7 21:12:56 YEKT 2016 >> nas@nas:/usr/obj/usr/src/sys/nasv3 >> amd64" >> >> Kernel panic is repeated at intervals of 2-3 days. >> At first I thought that >> the problem is in the hardware, but the problem >> did not go away after >> replacing the server platform. >> >> Coredumps and more info on link >> https://drive.google.com/open? >> id=3D0BxciMy2q7ZjTTkIxem9wTE1tM2M >> <https://drive.google.com/open >> ?id=3D0BxciMy2q7ZjTTkIxem9wTE1tM2M> >> >> Sorry for my english. >> I'll wait for an answer. >> >> This is known and long-stanging problem in the FreeBSD >> network stack. >> It shows up when you have lots of network interfaced >> created/removed >> frequently >> like in your case of Network Access Server (PPtP, >> PPPoE etc). >> >> Generally, people run into this problem using mpd5 >> network daemon. >> mpd5 uses NETGRAPH kernel subsystem to process traffic a= nd >> if an interface disappears (f.e., ,user disconnected) >> while kernel still processes traffic obtained from >> this interface, it >> panices. >> >> There were lots of reports of this problem. Noone >> seems to be working on >> it at the moment. >> You should fill a PR using Bugzilla and attach your >> logs to it. >> >> Eugene Grosbein >> >> > _______________________________________________ > freebsd-net@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >
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