From owner-freebsd-hackers@FreeBSD.ORG Mon Dec 25 15:36:01 2006 Return-Path: X-Original-To: freebsd-hackers@freebsd.org Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id D3F1416A403 for ; Mon, 25 Dec 2006 15:36:01 +0000 (UTC) (envelope-from myself@rojer.pp.ru) Received: from wooster.rojer.pp.ru (wooster.rojer.pp.ru [80.68.246.188]) by mx1.freebsd.org (Postfix) with ESMTP id 0C1C513C46E for ; Mon, 25 Dec 2006 15:36:01 +0000 (UTC) (envelope-from myself@rojer.pp.ru) Received: from wooster.rojer.pp.ru (localhost [127.0.0.1]) by wooster.rojer.pp.ru (Postfix) with ESMTP id 224BF114F7; Mon, 25 Dec 2006 18:18:11 +0300 (MSK) X-Spam-Checker-Version: SpamAssassin 3.1.6-rojer (2006-10-03) on wooster.rojer.pp.ru X-Spam-Level: X-Spam-Status: No, score=-4.4 required=5.0 tests=ALL_TRUSTED,BAYES_00 autolearn=ham version=3.1.6-rojer Received: from [IPv6:::1] (localhost [127.0.0.1]) by wooster.rojer.pp.ru (Postfix) with ESMTP; Mon, 25 Dec 2006 18:18:05 +0300 (MSK) Message-ID: <458FEBAA.7020104@rojer.pp.ru> Date: Mon, 25 Dec 2006 15:18:02 +0000 From: Deomid Ryabkov User-Agent: Thunderbird 1.5.0.8 (X11/20061113) MIME-Version: 1.0 To: Gonzalo Arana References: In-Reply-To: Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms070700030506060502020107" Cc: freebsd-hackers@freebsd.org Subject: Re: net/mpd causes a kernel freeze X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 25 Dec 2006 15:36:01 -0000 This is a cryptographically signed message in MIME format. --------------ms070700030506060502020107 Content-Type: text/plain; charset=KOI8-R; format=flowed Content-Transfer-Encoding: 7bit Gonzalo Arana wrote: > Hi, > > When I open a pptp tunnel with net/mpd, my PC freezes (numlock stops > responding, for instance). exactly. a complete freeze, not even being able to break into DDB (i.e. even ctrl-alt-esc stops working) > > I am using 6.1-RELEASE with GENERIC kernel. I've recompiled removing > USB, SCSI/RAID controllers, with the same result. also occurs on -CURRENT as of Nov 4. > The freeze occurs right after the tunnel is up. actually, it's after the first packet is sent. i.e., i can have tunnel up as long as i want, but as soon as a packet is sent down the route, the system freezes. > Does anyone expierence the same problem? yes. and i'm glad to report that i found a solution for at least my instance. it turned out to be a config error. so what happened was this. i created an entry for a new tunnel in my mpd.conf nad of course done that by just copy-pasting the previous entry. ended up with these mysterious freezes. because this happened on -CURRENT, i went through great pains to try it on something more -STABLE, but to my complete astonishment it was all the same on -STABLE. and i positively knew that -STABLE was previously able to handle a tunnel to this very same endpoint. now i knew something was not right. my -CURRENT is vanilla GENERIC, so it already had WITNESS, INVARIANTS and DDB, but neither did i see any messages on the console, nor could i break into debugger (i could, prior to the freeze, but not after). so anyway, some fairly long time into the whole process, i just decided to start commenting my config line by line, to maybe see if any particular option would trigger this freeze. and bingo, there it was: i used _wrong_ up_script for this connection. i wrote the right one, but forgot to change the config line i copied from previous entry. so yeh, it's 100% reproducible: wrong up_script - freeze, no up_script or the right one - no freeze. so what's in the script? here it is in its entirety: IF=$1 /sbin/route delete default /sbin/route add 10.1.0.0/16 10.2.0.1 /sbin/route add default -iface $IF that's it. now what is important here, is that the network and gateway in the second line are wrong for this network configuration. in particular, 10.2.0.1 is not directly reachable. it's worth noting that this configuration would hang the machine only if used for the very first time. if used after the correct configuration, it would not make machine hang. e.g., if i boot a machine, set up a tunnel with "up_script wrong_script.sh" and then ping an external host, the machine hangs. however, if i boot, set up a tunnel with "up_script right_script.sh" (at this point the tunnel works as expected and external host is pingable), then tear it down, replace "up_script right_script.sh" with "up_script wrong_script.sh", the machine does not hang and external host is not pingable (no route to host). my guess is that this incorrect route somehow messes up routing table. > > Here are the relevant configs: > >> /usr/local/etc/mpd/mpd.conf: >> >> default: >> load vpn >> >> vpn: >> new -i ng0 vpn vpn >> set iface disable on-demand >> set iface idle 0 >> # disconnect the client after 8 hours >> set iface session 28800 >> #set iface route 192.168.2.0/24 >> set bundle disable multilink >> set bundle authname my_username >> set bundle password my_password >> set link yes acfcomp protocomp >> set link no pap chap >> set link accept pap >> set link mtu 1460 >> # If remote machine is NT you need this.. >> # set link enable no-orig-auth >> set link keep-alive 10 75 >> set ipcp no vjcomp >> >> /usr/local/etc/mpd/mpd.links: >> vpn: >> set link type pptp >> set pptp self ZZZ >> set pptp peer YYY >> set pptp enable originate incoming outcall >> set pptp disable windowing >> >> >> where: >> ZZZ my ethernet IP address >> YYY ip address of TCP peer >> > > Thank you very much in advance, > -- Deomid Ryabkov aka Rojer myself@rojer.pp.ru rojer@sysadmins.ru ICQ: 8025844 --------------ms070700030506060502020107 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIJPTCC AvkwggJioAMCAQICEA6d3TvG5eRen2BAM1uAkm0wDQYJKoZIhvcNAQEEBQAwYjELMAkGA1UE BhMCWkExJTAjBgNVBAoTHFRoYXd0ZSBDb25zdWx0aW5nIChQdHkpIEx0ZC4xLDAqBgNVBAMT I1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBJc3N1aW5nIENBMB4XDTA2MDQwMTE4MjY1NFoX DTA3MDQwMTE4MjY1NFowXzEQMA4GA1UEBBMHUnlhYmtvdjEPMA0GA1UEKhMGRGVvbWlkMRcw FQYDVQQDEw5EZW9taWQgUnlhYmtvdjEhMB8GCSqGSIb3DQEJARYSbXlzZWxmQHJvamVyLnBw LnJ1MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAmnOKvalRf0lrl/4S2fAVovyt 2FxjDn8hDhSOeYNY97Ddi8Y2t+eELg7cpxAUq9GnymPBQanGlvUN2VTuSA4YUVg+VE1yhGgE TDKm0CNVh0v5LOVVAs52IFvdQ0wREYRH0nPBa/ovPWVvlsJ/cIR5GhvRfAW3FbvuP+bEYU54 ESo7OTu7EeGVOLBTF5ow1zaU9PStIied3ffaK5xl8lB6TnQ7DBnIir0ugCqdAuaVxsjD4SfG hqzv42uOuvNjFCQhtFn9dUSnx1cF1TI39cumqVV4UNrqDlQZ4bgrBu/ClqSI4oJnfxgafNkq oSVx7mXNuD1U7V8tJRbOiNdZFpS6mwIDAQABoy8wLTAdBgNVHREEFjAUgRJteXNlbGZAcm9q ZXIucHAucnUwDAYDVR0TAQH/BAIwADANBgkqhkiG9w0BAQQFAAOBgQAmvjeaZmSMwreI1RIl M1frBBOatokRhsStY6nyswNwxpCCcMGiK6sS8a0rtE4Iowvm48oCfXG062anUAFUMJ+e6Fse uOE1lJKrFQRJWGUzp61BOZJH8HZfKnrb7ll2GXY7YvvBicmif/wdjEBgp0WwNucm6jJS/57f mY3M9LQbwzCCAvkwggJioAMCAQICEA6d3TvG5eRen2BAM1uAkm0wDQYJKoZIhvcNAQEEBQAw YjELMAkGA1UEBhMCWkExJTAjBgNVBAoTHFRoYXd0ZSBDb25zdWx0aW5nIChQdHkpIEx0ZC4x LDAqBgNVBAMTI1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBJc3N1aW5nIENBMB4XDTA2MDQw MTE4MjY1NFoXDTA3MDQwMTE4MjY1NFowXzEQMA4GA1UEBBMHUnlhYmtvdjEPMA0GA1UEKhMG RGVvbWlkMRcwFQYDVQQDEw5EZW9taWQgUnlhYmtvdjEhMB8GCSqGSIb3DQEJARYSbXlzZWxm QHJvamVyLnBwLnJ1MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAmnOKvalRf0lr l/4S2fAVovyt2FxjDn8hDhSOeYNY97Ddi8Y2t+eELg7cpxAUq9GnymPBQanGlvUN2VTuSA4Y UVg+VE1yhGgETDKm0CNVh0v5LOVVAs52IFvdQ0wREYRH0nPBa/ovPWVvlsJ/cIR5GhvRfAW3 FbvuP+bEYU54ESo7OTu7EeGVOLBTF5ow1zaU9PStIied3ffaK5xl8lB6TnQ7DBnIir0ugCqd AuaVxsjD4SfGhqzv42uOuvNjFCQhtFn9dUSnx1cF1TI39cumqVV4UNrqDlQZ4bgrBu/ClqSI 4oJnfxgafNkqoSVx7mXNuD1U7V8tJRbOiNdZFpS6mwIDAQABoy8wLTAdBgNVHREEFjAUgRJt eXNlbGZAcm9qZXIucHAucnUwDAYDVR0TAQH/BAIwADANBgkqhkiG9w0BAQQFAAOBgQAmvjea ZmSMwreI1RIlM1frBBOatokRhsStY6nyswNwxpCCcMGiK6sS8a0rtE4Iowvm48oCfXG062an UAFUMJ+e6FseuOE1lJKrFQRJWGUzp61BOZJH8HZfKnrb7ll2GXY7YvvBicmif/wdjEBgp0Ww Nucm6jJS/57fmY3M9LQbwzCCAz8wggKooAMCAQICAQ0wDQYJKoZIhvcNAQEFBQAwgdExCzAJ BgNVBAYTAlpBMRUwEwYDVQQIEwxXZXN0ZXJuIENhcGUxEjAQBgNVBAcTCUNhcGUgVG93bjEa MBgGA1UEChMRVGhhd3RlIENvbnN1bHRpbmcxKDAmBgNVBAsTH0NlcnRpZmljYXRpb24gU2Vy dmljZXMgRGl2aXNpb24xJDAiBgNVBAMTG1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBDQTEr MCkGCSqGSIb3DQEJARYccGVyc29uYWwtZnJlZW1haWxAdGhhd3RlLmNvbTAeFw0wMzA3MTcw MDAwMDBaFw0xMzA3MTYyMzU5NTlaMGIxCzAJBgNVBAYTAlpBMSUwIwYDVQQKExxUaGF3dGUg Q29uc3VsdGluZyAoUHR5KSBMdGQuMSwwKgYDVQQDEyNUaGF3dGUgUGVyc29uYWwgRnJlZW1h aWwgSXNzdWluZyBDQTCBnzANBgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEAxKY8VXNV+065ypla HmjAdQRwnd/p/6Me7L3N9VvyGna9fww6YfK/Uc4B1OVQCjDXAmNaLIkVcI7dyfArhVqqP3FW y688Cwfn8R+RNiQqE88r1fOCdz0Dviv+uxg+B79AgAJk16emu59l0cUqVIUPSAR/p7bRPGEE QB5kGXJgt/sCAwEAAaOBlDCBkTASBgNVHRMBAf8ECDAGAQH/AgEAMEMGA1UdHwQ8MDowOKA2 oDSGMmh0dHA6Ly9jcmwudGhhd3RlLmNvbS9UaGF3dGVQZXJzb25hbEZyZWVtYWlsQ0EuY3Js MAsGA1UdDwQEAwIBBjApBgNVHREEIjAgpB4wHDEaMBgGA1UEAxMRUHJpdmF0ZUxhYmVsMi0x MzgwDQYJKoZIhvcNAQEFBQADgYEASIzRUIPqCy7MDaNmrGcPf6+svsIXoUOWlJ1/TCG4+DYf qi2fNi/A9BxQIJNwPP2t4WFiw9k6GX6EsZkbAMUaC4J0niVQlGLH2ydxVyWN3amcOY6MIE9l X5Xa9/eH1sYITq726jTlEBpbNU1341YheILcIRk13iSx0x1G/11fZU8xggNkMIIDYAIBATB2 MGIxCzAJBgNVBAYTAlpBMSUwIwYDVQQKExxUaGF3dGUgQ29uc3VsdGluZyAoUHR5KSBMdGQu MSwwKgYDVQQDEyNUaGF3dGUgUGVyc29uYWwgRnJlZW1haWwgSXNzdWluZyBDQQIQDp3dO8bl 5F6fYEAzW4CSbTAJBgUrDgMCGgUAoIIBwzAYBgkqhkiG9w0BCQMxCwYJKoZIhvcNAQcBMBwG CSqGSIb3DQEJBTEPFw0wNjEyMjUxNTE4MDJaMCMGCSqGSIb3DQEJBDEWBBRPRSVHwT+eGMJv YgodLa5uC8+PSDBSBgkqhkiG9w0BCQ8xRTBDMAoGCCqGSIb3DQMHMA4GCCqGSIb3DQMCAgIA gDANBggqhkiG9w0DAgIBQDAHBgUrDgMCBzANBggqhkiG9w0DAgIBKDCBhQYJKwYBBAGCNxAE MXgwdjBiMQswCQYDVQQGEwJaQTElMCMGA1UEChMcVGhhd3RlIENvbnN1bHRpbmcgKFB0eSkg THRkLjEsMCoGA1UEAxMjVGhhd3RlIFBlcnNvbmFsIEZyZWVtYWlsIElzc3VpbmcgQ0ECEA6d 3TvG5eRen2BAM1uAkm0wgYcGCyqGSIb3DQEJEAILMXigdjBiMQswCQYDVQQGEwJaQTElMCMG A1UEChMcVGhhd3RlIENvbnN1bHRpbmcgKFB0eSkgTHRkLjEsMCoGA1UEAxMjVGhhd3RlIFBl cnNvbmFsIEZyZWVtYWlsIElzc3VpbmcgQ0ECEA6d3TvG5eRen2BAM1uAkm0wDQYJKoZIhvcN AQEBBQAEggEAYdSTzz82TJGNgBKmfKLpQfdRZT6YjQeKFwbegXs9FMxJEEq6epSOhM0a1xNf zBs97Bk3hVH7aQtdphk3sIPKceHPhQs6dM0wueHBFP/DvBs8vEPEBnVXQ2jMQG4CusjhFuv/ 58zhQ2AIqWK2vlG/KQ8UyNnV+mg1qWnj/S9T4rl6GxuKGVIzbdITnvSy2kUejiQlhm+4YfvJ 5PUCvzWIj7pOZ8c5UlfDEM3AQI6NQbxCwCpbtn7dFxCPAfmNL8TH24G19q8AqKTnGM1vOf3b RYAlLEclPws7bvnQmRldmmwYICV4E0EMvuGGgobF8ApUiKzEw4u1czqV5coDW2eHhwAAAAAA AA== --------------ms070700030506060502020107--