From owner-kdb@oss.sgi.com Tue Jun 5 08:20:28 2001 Received: (from majordomo@localhost) by oss.sgi.com (8.11.3/8.11.3) id f55FKSC30101 for kdb-outgoing; Tue, 5 Jun 2001 08:20:28 -0700 Received: from mx2out.umbc.edu (mx2out.umbc.edu [130.85.253.52]) by oss.sgi.com (8.11.3/8.11.3) with SMTP id f55FKRh30090 for ; Tue, 5 Jun 2001 08:20:27 -0700 Received: from gl.umbc.edu (jjasen1@irix2.gl.umbc.edu [130.85.60.11]) by mx2out.umbc.edu (8.11.3/8.11.3) with ESMTP id f55FKj500074; Tue, 5 Jun 2001 11:20:45 -0400 (EDT) Received: from localhost (jjasen1@localhost) by gl.umbc.edu (8.9.0/8.9.0) with ESMTP id LAA10317867; Tue, 5 Jun 2001 11:20:26 -0400 (EDT) X-Authentication-Warning: irix2.gl.umbc.edu: jjasen1 owned process doing -bs Date: Tue, 5 Jun 2001 11:20:26 -0400 From: John Jasen X-X-Sender: To: cc: Subject: strange network hangs using kdb Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-kdb@oss.sgi.com Precedence: bulk We have two similar systems, using acenic gigabit cards, plugged into a 3com Superstack 3 10/100/1000 switch. When we use kdb on one of the systems, the other system stops receiving packets. We've seen this from kernel 2.4.2 with the kdb patches from oss.sgi.com to 2.4.4 with the patches. Are there any thoughts on this? Any other information that may prove to be useful? -- -- John E. Jasen (jjasen1@umbc.edu) -- In theory, theory and practise are the same. In practise, they aren't. From owner-kdb@oss.sgi.com Tue Jun 5 08:55:54 2001 Received: (from majordomo@localhost) by oss.sgi.com (8.11.3/8.11.3) id f55Fts403346 for kdb-outgoing; Tue, 5 Jun 2001 08:55:54 -0700 Received: from mail.ocs.com.au (ppp0.ocs.com.au [203.34.97.3]) by oss.sgi.com (8.11.3/8.11.3) with SMTP id f55Ftqh03339 for ; Tue, 5 Jun 2001 08:55:52 -0700 Received: (qmail 28244 invoked from network); 5 Jun 2001 15:55:49 -0000 Received: from ocs3.ocs-net (192.168.255.3) by mail.ocs.com.au with SMTP; 5 Jun 2001 15:55:49 -0000 X-Mailer: exmh version 2.1.1 10/15/1999 From: Keith Owens To: John Jasen cc: linux-kernel@vger.kernel.org, kdb@oss.sgi.com Subject: Re: strange network hangs using kdb In-reply-to: Your message of "Tue, 05 Jun 2001 11:20:26 -0400." Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Wed, 06 Jun 2001 01:55:48 +1000 Message-ID: <18623.991756548@ocs3.ocs-net> Sender: owner-kdb@oss.sgi.com Precedence: bulk On Tue, 5 Jun 2001 11:20:26 -0400, John Jasen wrote: >When we use kdb on one of the systems, the other system stops receiving >packets. man linux/Documentation/kdb/kdb.mm, section Interrupts and KDB. From owner-kdb@oss.sgi.com Tue Jun 5 09:20:27 2001 Received: (from majordomo@localhost) by oss.sgi.com (8.11.3/8.11.3) id f55GKRx05593 for kdb-outgoing; Tue, 5 Jun 2001 09:20:27 -0700 Received: from mx2out.umbc.edu (mx2out.umbc.edu [130.85.253.52]) by oss.sgi.com (8.11.3/8.11.3) with SMTP id f55GKQh05589 for ; Tue, 5 Jun 2001 09:20:26 -0700 Received: from gl.umbc.edu (jjasen1@irix2.gl.umbc.edu [130.85.60.11]) by mx2out.umbc.edu (8.11.3/8.11.3) with ESMTP id f55GKP501886; Tue, 5 Jun 2001 12:20:25 -0400 (EDT) Received: from localhost (jjasen1@localhost) by gl.umbc.edu (8.9.0/8.9.0) with ESMTP id MAA11160283; Tue, 5 Jun 2001 12:20:25 -0400 (EDT) X-Authentication-Warning: irix2.gl.umbc.edu: jjasen1 owned process doing -bs Date: Tue, 5 Jun 2001 12:20:25 -0400 From: John Jasen X-X-Sender: To: Keith Owens cc: , Subject: Re: strange network hangs using kdb In-Reply-To: <18623.991756548@ocs3.ocs-net> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-kdb@oss.sgi.com Precedence: bulk On Wed, 6 Jun 2001, Keith Owens wrote: > On Tue, 5 Jun 2001 11:20:26 -0400, > John Jasen wrote: > >When we use kdb on one of the systems, the other system stops receiving > >packets. > > man linux/Documentation/kdb/kdb.mm, section Interrupts and KDB. I would expect one system to fall off the network, when it is put into kdb. However, why does it have any effect on the other system, which may or may not be in kdb? Let's say we have two test servers (A and B); and four test clients (1-4). 1 and 2 are being used to test performance on A, while 3 and 4 are being inflicted on B. kdb is activated on A, and from that moment, no network traffic passes between B and its clients, 3 and 4. -- -- John E. Jasen (jjasen1@umbc.edu) -- In theory, theory and practise are the same. In practise, they aren't. From owner-kdb@oss.sgi.com Tue Jun 5 09:38:15 2001 Received: (from majordomo@localhost) by oss.sgi.com (8.11.3/8.11.3) id f55GcFt06009 for kdb-outgoing; Tue, 5 Jun 2001 09:38:15 -0700 Received: from mail.ocs.com.au (ppp0.ocs.com.au [203.34.97.3]) by oss.sgi.com (8.11.3/8.11.3) with SMTP id f55GcCh06005 for ; Tue, 5 Jun 2001 09:38:12 -0700 Received: (qmail 28631 invoked from network); 5 Jun 2001 16:38:08 -0000 Received: from ocs3.ocs-net (192.168.255.3) by mail.ocs.com.au with SMTP; 5 Jun 2001 16:38:08 -0000 X-Mailer: exmh version 2.1.1 10/15/1999 From: Keith Owens To: John Jasen cc: linux-kernel@vger.kernel.org, kdb@oss.sgi.com Subject: Re: strange network hangs using kdb In-reply-to: Your message of "Tue, 05 Jun 2001 12:20:25 -0400." Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Wed, 06 Jun 2001 02:38:08 +1000 Message-ID: <19199.991759088@ocs3.ocs-net> Sender: owner-kdb@oss.sgi.com Precedence: bulk On Tue, 5 Jun 2001 12:20:25 -0400, John Jasen wrote: >On Wed, 6 Jun 2001, Keith Owens wrote: >> On Tue, 5 Jun 2001 11:20:26 -0400, >> John Jasen wrote: >> >When we use kdb on one of the systems, the other system stops receiving >> >packets. >> >> man linux/Documentation/kdb/kdb.mm, section Interrupts and KDB. > >I would expect one system to fall off the network, when it is put into >kdb. However, why does it have any effect on the other system, which may >or may not be in kdb? It does not. kdb is intrusive when it trips but even it cannot reach across a network and stop another machine. Look for a networking problem on the other system. From owner-kdb@oss.sgi.com Tue Jun 5 10:10:20 2001 Received: (from majordomo@localhost) by oss.sgi.com (8.11.3/8.11.3) id f55HAKi07103 for kdb-outgoing; Tue, 5 Jun 2001 10:10:20 -0700 Received: from eagle.verisign.com (eagle.verisign.com [208.206.241.105]) by oss.sgi.com (8.11.3/8.11.3) with SMTP id f55HAKh07100 for ; Tue, 5 Jun 2001 10:10:20 -0700 Received: from postal-gw2.verisign.com (verisign.com [63.104.27.102]) by eagle.verisign.com (8.9.3/BCH1.7.1) with ESMTP id KAA06780; Tue, 5 Jun 2001 10:12:57 -0700 (PDT) From: slurn@verisign.com Received: from slurndal-lnx.verisign.com ([10.25.27.123]) by postal-gw2.verisign.com with SMTP (Microsoft Exchange Internet Mail Service Version 5.5.2653.13) id KZT2TZYA; Tue, 5 Jun 2001 10:10:15 -0700 Received: by slurndal-lnx.verisign.com; Tue, 5 Jun 2001 10:10:14 -0700 Message-Id: <200106051710.KAA03726@slurndal-lnx.verisign.com> Subject: Re: strange network hangs using kdb To: kaos@ocs.com.au (Keith Owens) Date: Tue, 5 Jun 2001 10:10:14 -0700 (PDT) Cc: jjasen1@umbc.edu (John Jasen), linux-kernel@vger.kernel.org, kdb@oss.sgi.com In-Reply-To: <19199.991759088@ocs3.ocs-net> from "Keith Owens" at Jun 06, 2001 02:38:08 AM X-Mailer: ELM [version 2.5 PL1] MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-kdb@oss.sgi.com Precedence: bulk > > On Tue, 5 Jun 2001 12:20:25 -0400, > John Jasen wrote: > >On Wed, 6 Jun 2001, Keith Owens wrote: > >> On Tue, 5 Jun 2001 11:20:26 -0400, > >> John Jasen wrote: > >> >When we use kdb on one of the systems, the other system stops receiving > >> >packets. > >> > >> man linux/Documentation/kdb/kdb.mm, section Interrupts and KDB. > > > >I would expect one system to fall off the network, when it is put into > >kdb. However, why does it have any effect on the other system, which may > >or may not be in kdb? > > It does not. kdb is intrusive when it trips but even it cannot reach > across a network and stop another machine. Look for a networking > problem on the other system. > Might the machine running kdb also be acting as a gateway or router for the other boxen? This would account for the lack of connectivity. scott From owner-kdb@oss.sgi.com Tue Jun 5 10:17:03 2001 Received: (from majordomo@localhost) by oss.sgi.com (8.11.3/8.11.3) id f55HH3e07576 for kdb-outgoing; Tue, 5 Jun 2001 10:17:03 -0700 Received: from mx3out.umbc.edu (mx3out.umbc.edu [130.85.253.53]) by oss.sgi.com (8.11.3/8.11.3) with SMTP id f55HH2h07573 for ; Tue, 5 Jun 2001 10:17:02 -0700 Received: from gl.umbc.edu (jjasen1@irix2.gl.umbc.edu [130.85.60.11]) by mx3out.umbc.edu (8.11.3/8.11.3) with ESMTP id f55HH0103390; Tue, 5 Jun 2001 13:17:00 -0400 (EDT) Received: from localhost (jjasen1@localhost) by gl.umbc.edu (8.9.0/8.9.0) with ESMTP id NAA11258348; Tue, 5 Jun 2001 13:16:59 -0400 (EDT) X-Authentication-Warning: irix2.gl.umbc.edu: jjasen1 owned process doing -bs Date: Tue, 5 Jun 2001 13:16:58 -0400 From: John Jasen X-X-Sender: To: cc: Keith Owens , , Subject: Re: strange network hangs using kdb In-Reply-To: <200106051710.KAA03726@slurndal-lnx.verisign.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-kdb@oss.sgi.com Precedence: bulk On Tue, 5 Jun 2001 slurn@verisign.com wrote: > Might the machine running kdb also be acting as a gateway or router > for the other boxen? This would account for the lack of connectivity. Nope. No such luck. I _wish_ it was that easy. :) As for it being a network problem, it is -- and completely reproducable. Fire up kdb, and no-one receives packets. Otherwise, no problems occur -- even when both systems are under heavy network load. -- -- John E. Jasen (jjasen1@umbc.edu) -- In theory, theory and practise are the same. In practise, they aren't. From owner-kdb@oss.sgi.com Tue Jun 5 10:47:45 2001 Received: (from majordomo@localhost) by oss.sgi.com (8.11.3/8.11.3) id f55HljO09931 for kdb-outgoing; Tue, 5 Jun 2001 10:47:45 -0700 Received: from sbcs.cs.sunysb.edu (sbcs.sunysb.edu [130.245.1.15]) by oss.sgi.com (8.11.3/8.11.3) with SMTP id f55Hlih09924 for ; Tue, 5 Jun 2001 10:47:44 -0700 Received: from sbtzi-cker.cs.sunysb.edu (sbtzi-cker [130.245.1.65]) by sbcs.cs.sunysb.edu (8.9.3/8.9.3) with ESMTP id NAA15609; Tue, 5 Jun 2001 13:45:25 -0400 (EDT) Received: from localhost by sbtzi-cker.cs.sunysb.edu (8.8.8+Sun/SMI-SVR4) id NAA22307; Tue, 5 Jun 2001 13:42:58 -0400 (EDT) Date: Tue, 5 Jun 2001 13:42:50 -0400 (EDT) From: Srikant Sharma X-X-Sender: To: John Jasen cc: , Keith Owens , , Subject: Re: strange network hangs using kdb In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-kdb@oss.sgi.com Precedence: bulk Are you using eepro100 network cards ? Because we have observed that many times when we enter kdb the card on this machine goes crazy and starts pumping 8808 congestion control packets and other cards stop sending data over the network. try tcpdump and see if something like this is going on .. -- Srikant On Tue, 5 Jun 2001, John Jasen wrote: > On Tue, 5 Jun 2001 slurn@verisign.com wrote: > > > Might the machine running kdb also be acting as a gateway or router > > for the other boxen? This would account for the lack of connectivity. > > Nope. No such luck. I _wish_ it was that easy. :) > > As for it being a network problem, it is -- and completely reproducable. > Fire up kdb, and no-one receives packets. Otherwise, no problems occur -- > even when both systems are under heavy network load. > > -- > -- John E. Jasen (jjasen1@umbc.edu) > -- In theory, theory and practise are the same. In practise, they aren't. > > From owner-kdb@oss.sgi.com Sun Jun 10 22:43:18 2001 Received: (from majordomo@localhost) by oss.sgi.com (8.11.2/8.11.3) id f5B5hIg29111 for kdb-outgoing; Sun, 10 Jun 2001 22:43:18 -0700 Received: from wiproecmx1.wipro.com (wiproecmx1.wipro.com [164.164.31.5]) by oss.sgi.com (8.11.2/8.11.3) with SMTP id f5B5hDV29103 for ; Sun, 10 Jun 2001 22:43:14 -0700 Received: from ecvwall1.wipro.com (ecvwall1.wipro.com [192.168.181.23]) by wiproecmx1.wipro.com (8.11.3/8.11.3) with SMTP id f5BG2Wj23808 for ; Mon, 11 Jun 2001 11:02:33 -0500 (GMT) Received: from wipro.com ([127.0.0.1]) by ecmail.mail.wipro.com (Netscape Messaging Server 4.15) with ESMTP id GER3SF00.HIU for ; Mon, 11 Jun 2001 11:11:03 +0530 From: "Manish Hira" To: kdb@oss.sgi.com Message-ID: <15964e1561ff.1561ff15964e@wipro.com> Date: Mon, 11 Jun 2001 10:41:03 +0500 X-Mailer: Netscape Webmail MIME-Version: 1.0 Content-Language: en Subject: Stack Trace X-Accept-Language: en Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: 7bit Sender: owner-kdb@oss.sgi.com Precedence: bulk Hi, I am using KDB 1.2 for debugging kernel loadable modules, but on using the command "bt" (Stack Backtrace)of the debugger, KDB shows only the functions of the kernel and is not able to show the functions in the kernel module. The debugger shows the function call of the module as "unknown". The kernel loadable module is being installed manually using "insmod" command. Is there any configuration setting that is required ? Thanks in advance .. -MANISH. From owner-kdb@oss.sgi.com Sun Jun 10 23:00:41 2001 Received: (from majordomo@localhost) by oss.sgi.com (8.11.2/8.11.3) id f5B60fw30632 for kdb-outgoing; Sun, 10 Jun 2001 23:00:41 -0700 Received: from ocs4.ocs-net (firewall.ocs.com.au [203.34.97.9]) by oss.sgi.com (8.11.2/8.11.3) with SMTP id f5B60cV30627 for ; Sun, 10 Jun 2001 23:00:38 -0700 Received: from ocs4.ocs-net (kaos@localhost) by ocs4.ocs-net (8.11.2/8.11.2) with ESMTP id f5B61Ow12200; Mon, 11 Jun 2001 16:01:24 +1000 X-Authentication-Warning: ocs4.ocs-net: kaos owned process doing -bs X-Mailer: exmh version 2.2 06/23/2000 with nmh-1.0.4 From: Keith Owens To: "Manish Hira" cc: kdb@oss.sgi.com Subject: Re: Stack Trace In-reply-to: Your message of "Mon, 11 Jun 2001 10:41:03 +0500." <15964e1561ff.1561ff15964e@wipro.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Mon, 11 Jun 2001 16:01:24 +1000 Message-ID: <12199.992239284@ocs4.ocs-net> Sender: owner-kdb@oss.sgi.com Precedence: bulk On Mon, 11 Jun 2001 10:41:03 +0500, "Manish Hira" wrote: > I am using KDB 1.2 for debugging kernel loadable modules, but on using >the command "bt" (Stack Backtrace)of the debugger, KDB shows only the >functions of the kernel and is not able to show the functions in the >kernel module. The debugger shows the function call of the module as >"unknown". kdb 1.2 is hopelessly out of date and has poor module support. Upgrade to a more recent kdb from ftp://oss.sgi.com/projects/kdb/download. And before you ask, SGI are not maintaining kdb for 2.2 kernels, only for 2.4.