- WLUG - wlug.mailman3.com

Re: [Wlug] HOWTO debug hard lockups

by Andy Stewart

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Andy Stewart wrote: > > HI everybody, > > Perhaps I have found some light in this tunnel. > > I upgraded to the 2.6.12 kernel (yeah, I know, that just changed the > entire experiment) and turned off "CPU freq scaling" and "PCI hotplug > support" since I didn't think I needed either of those. I built the > 2.6.12 kernel and played beer_golf 5 times in a row and the system DID > NOT lockup. I'm not sure why those features were enabled in the first > place. (I should probably go back to 2.6.11.11 and disable these two > features and see if that has any positive effect.) > > I'm far too much of a pessimist to claim victory, but perhaps my luck is > turning for the better. My fingers are still crossed. I am (extremely) > cautiously optimistic. > > I thought I'd mention this in case somebody reads this thread in the > future and maybe, just maybe, this tidbit helps. Besides, I've read a > lot of threads where the problem is described in detail, but the answer > is never forthcoming(!). > > Later, > > Andy > > Hi Everybody, I went back to the 2.6.11.11 kernel and turned off the "CPU freq scaling" and "PCI hotplug support", but it didn't matter, as this kernel still locks up on me very quickly with the beer_golf.swf game (a copy of which I've saved as a diagnostic for future kernels to which I might upgrade - a *long* time from now). I am therefore concluding that something in 2.6.12 has fixed this problem since I have not yet locked up this kernel (under any conditions). I did notice several K8 and AMD64 specific notes in the CHANGELOG for this kernel. Thanks again(!!) for all of your helpful suggestions. Andy - -- Andy Stewart, Founder Worcester Linux Users' Group Worcester, MA, USA http://www.wlug.org -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFCwMEEHl0iXDssISsRAsRgAJ0ZDt/dlQrN+t1KRvgoBoC97yhcmgCfT7Vo 31dPPiB3sSKrDsx/FjhHYzs= =7kuI -----END PGP SIGNATURE-----

June 28, 2005

[Fwd: LUG Leaders -- your most recent book shipment from AW/PHPTR]

by Andy Stewart

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Everybody, Please note that the books which I've been raffling at WLUG meetings for the last few months have come from Addison-Wesley publishing. Here is more information from the publisher, including the URL where you can submit your review of any of these books, and information on how to receive a LUG discount on future purchases. I did receive two of their "SPRING INTO" series books, and they will be raffled at a future WLUG meeting. Many thanks to this publisher for supplying us with books to review! Happy Reading, Andy - -------- Original Message -------- Subject: LUG Leaders -- your most recent book shipment from AW/PHPTR Date: Thu, 23 Jun 2005 19:30:09 -0500 From: Heather.Fox(a)pearsoned.com To: andystewart(a)COMCAST.NET Hello Linux User Group Leaders: Please be advised that you will soon receive a June, 2005, book shipment from Publisher Addison-Wesley Professional http://www.awprofessional.com containing review copies of two flagship books from our newest book series, titled the SPRING INTO Series. Also, read below for details on how you and your UG members can receive a 35% discount off list price [inc. FREE shipping via UPS Ground when shipping within the U.S.] for any Addison-Wesley or Prentice Hall PTR book. The review copy titles you will receive are: 1)"Spring Into Linux" by Janet Valade: http://www.awprofessional.com/title/0131853546; 2) "Spring Into Technical Writing" by Barry Rosenberg: http://www.awprofessional.com/title/0131498630. These titles are from the new Addison-Wesley SPRING INTO Series: http://www.awprofessional.com/springinto. ************************************************************ PLEASE ASK YOUR MEMBERS TO SUBMIT REVIEWS FOR THESE BOOKS DIRECTLY ONLINE! Introducing the new Addison-Wesley REVIEWS LINK. Now you can ask your LUG members to easily and directly submit reviews of the books, which they borrow and/or "win" at your User Group meetings. Simply click the link below, and REVIEW AWAY! http://www.awprofessional.com/reviews ************************************************************ SPECIAL DISCOUNT COUPON FOR LUG MEMBERS FOR ANY BOOK FROM ADDISON-WESLEY/ PRENTICE HALL PTR: Step 1: visit http://www.awprofessional.com or http://www.phptr.com and add desired books to "shopping cart" Step 2: Proceed to checkout Step 3: Enter billing and shipping address [if different from billing address] Step 4: Choose a shipping method [UPS Ground is *FREE* within the U.S.!] Step 5: TO OBTAIN YOUR 35% DISCOUNT, enter the coupon code: LUG [case-sensitive], during "Checkout". Step 6: Coupon expires August 1, 2005. ************************************************************ If you have any questions, please don't hesitate to contact me. Happy Reading! Sincerely, User Group Liaison Heather Fox - -- Andy Stewart, Founder Worcester Linux Users' Group Worcester, MA, USA http://www.wlug.org -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFCvGp+Hl0iXDssISsRAgGoAJ9TMEv417KQE9oZkDNrO9X5Rb6r2ACgiJkl 6P/NYq5sD/4ZTmKbHShWlIc= =I9cI -----END PGP SIGNATURE-----

June 24, 2005

[Fwd: An Invitation for a Free Webcast: Rocks Cluster and Object Storag e]

by Andy Stewart

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - -------- Original Message -------- Subject: An Invitation for a Free Webcast: Rocks Cluster and Object Storag e Date: Thu, 23 Jun 2005 17:00:02 -0700 From: Ortiz, Monica <mortiz(a)panasas.com> To: 'andystewart(a)comcast.net' <andystewart(a)comcast.net> June 23, 2005 Dear Mr. Stewart: Panasas invites you and Worcester LUG members to attend a complimentary, online seminar that describes how Stanford University's Institute for Computational and Mathematical Engineering (ICME) achieved exceptional performance and maximum utilization with its Linux cluster. In particular, the seminar will provide details on how the Institute combined Rocks software with an object-based storage system to increase the productivity of its cluster. Rocks Clusters and Object Storage Wednesday, June 29, 2005, 11:00 AM PDT http://panasasevents.webex.com Researchers at ICME use HPC as part of a comprehensive research program. These systems are used to better predict flutter and limit cycle oscillations for modern aircraft, to better understand the impact of turbulent flow on jet engines, and to develop computational methodologies that can facilitate the design of naval systems with lower signature levels. This research can lead to improvements in the performance and safety of aircraft, reduction of engine noise, which will improve the quality of life for people living near airports, and new underwater navigation systems. To accomplish this, ICME needed a cluster to tackle large-scale simulations of flow/structure interaction, aeroacoustic, and elasto-acoustic scattering problems. Join us in discussing how ICME utilized the 164-node Nivation Linux cluster and object-based storage to create a system that is scalable, easy to integrate and manage, and delivers extremely high bandwidth and random I/O. Register for this informative online seminar to: * Hear the challenges ICME faced in building a cluster capable of handling complex mathematical simulations * Learn how object storage systems, like those of Panasas, break I/O bottlenecks hindering cluster performance * Hear Steve Jones' personal experience in managing large-scale Rock clusters and the integration of the Panasas ActiveScale Storage Cluster Highlighted Speakers Steve Jones, Technology Operations Manager, Institute for Computational and Mathematical Engineering, Stanford University Larry Jones, Vice President of Product Marketing, Panasas Register Online Today! There are no fees for this event. To register, just point your browser to: http://panasasevents.webex.com Please let me know if you have any questions or trouble registering for this event. Monica Ortiz Events Coordinator Panasas, Inc. - -- Andy Stewart, Founder Worcester Linux Users' Group Worcester, MA, USA http://www.wlug.org -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFCvGlzHl0iXDssISsRAjpEAJ9Vox3a4mALakBkB5lJB3cOR8fsVACfWnnF wKIi2NjUxHELanh2dfT4z84= =wP7M -----END PGP SIGNATURE-----

June 24, 2005

Re: [Wlug] HOWTO debug hard lockups

by Andy Stewart

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Andy Stewart wrote: > > HI Jeff, > > If I do an alt-sysrq-h, I get the one line help on the serial console. > If I do alt-sysrq-m to show memory, I see "SysRq : Show Memory" ont the > serial console, but nothing more (unless I use Eric's trick). If I go > to runlevel 1, alt-sysrq-m has the entire output on the serial console. > > Later, > > Andy HI Everybody, The problem of the serial console not responding as I expected has been solved. It turns out that on my system, in /etc/sysconfig/syslog, the loglevel is set to 1. If it is set to 8, then all of the kernel messages will come out on the serial console. I set this with the MagicSysReq key and now it works as I expect. Many thanks to Jeff Moyer for his help with this problem. Later, Andy > > > > -- > Andy Stewart, Founder > Worcester Linux Users' Group > Worcester, MA, USA > http://www.wlug.org > _______________________________________________ Wlug mailing list Wlug(a)mail.wlug.org http://mail.wlug.org/mailman/listinfo/wlug - -- Andy Stewart, Founder Worcester Linux Users' Group Worcester, MA, USA http://www.wlug.org -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFCugdJHl0iXDssISsRAq7FAJ9c93PzhdT2YAahG50wHRTKCkTOtgCeOCox ahEmSJk/eDlUH7JwXHZDiBE= =Q8ta -----END PGP SIGNATURE-----

June 23, 2005

Re: [Wlug] HOWTO debug hard lockups

by Jeff Moyer

==> Regarding Re: [Wlug] HOWTO debug hard lockups; Eric Martin <freak4uxxx(a)gmail.com> adds: freak4uxxx> Right, I forgot about that jeff. If you're running syslog-ng, freak4uxxx> you can go into /etc/syslog-ng/syslog-ng.conf and add a line: freak4uxxx> destination console_all { ("/dev/ttyS01"); }; freak4uxxx> although, I'm not sure if you're locking up if syslog-ng will freak4uxxx> keep scrolling. I don't know if netcat (nc) will either... syslog-ng is user space. The kernel should do all of its console writes itself. Your suggestion does not help in the hung system case. Netcat, used as I described (on the system that is receiving messages), is fine. The kernel is outputting the log messages over the network via the netpoll infrastructure. That infrastructure can function even when the system is not servicing interrupts. -Jeff freak4uxxx> On 6/21/05, Jeff Moyer <jmoyer(a)redhat.com> wrote: >> ==> Regarding Re: [Wlug] HOWTO debug hard lockups; Andy Stewart < >> andystewart(a)comcast.net> adds: >> andystewart> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 >> andystewart> Jeff Moyer wrote: >> >> ==> Regarding Re: [Wlug] HOWTO debug hard lockups; Andy Stewart >> >> <andystewart(a)comcast.net> adds: >> >> andystewart> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 >> >> andystewart> Eric Martin wrote: >> >>>> In reguards to seeing messages on minicom, what logger do you have >> >>>> installed? Can you just shovel kernel messages over to ttyS01? eg >> >>>> sudo tailf /var/log/kernel ttyS01 >> >> andystewart> I did that per your suggestion and it works just fine. >> >> Umm, it works just fine so long as the system is up and running. You >> >> really want the kernel to be printing directly to the console. >> >> Otherwise, when the system locks up and the NMI fires, you still won't >> >> get your messages over the serial console. >> >> >> >> Andy, it looked to me like you had things configured >> properly. Indeed, >> I use a very similar setup all of the time. The >> only difference is it >> works for me. (I hate that phrase). >> >> >> >> I'm not sure what to suggest at this point. If you do an alt-sysrq-h, >> >> does that at least print out over the serial console? >> >> >> >> -Jeff >> >> >> andystewart> HI Jeff, >> andystewart> If I do an alt-sysrq-h, I get the one line help on the serial andystewart> console. If I do alt-sysrq-m to show memory, I see "SysRq : andystewart> Show Memory" ont the serial console, but nothing more (unless andystewart> I use Eric's trick). If I go to runlevel 1, alt-sysrq-m has andystewart> the entire output on the serial console. >> You have all of the luck. How about trying netconsole? It's easy enough >> to setup. On the host which will receive the logs, do something like >> this: >> >> nc -u -l -p 6666 >> >> On the problematic system, load the netconsole module: >> >> modprobe netconsole >> netconsole=@<ip-of-this-machine>/<ethX>,6666@<ip-of-server>/<MAC-address-of-server> >> >> >> You can try this or not, depending on whether you still experience >> crashes. It sounds like the latest kernel fixed things right up for you, >> right? >> >> Oh well, good to have in your bag of tricks, I guess. >> >> -Jeff _______________________________________________ Wlug mailing list >> Wlug(a)mail.wlug.org http://mail.wlug.org/mailman/listinfo/wlug >> freak4uxxx> Right, I forgot about that jeff.  If you're running freak4uxxx> syslog-ng, you can go into /etc/syslog-ng/syslog-ng.conf and freak4uxxx> add a line: <div style="margin-left: 40px;"> style="font-style: italic;">destination console_all {  freak4uxxx> ("/dev/ttyS01"); }; </div> although, freak4uxxx> I'm not sure if you're locking up if syslog-ng will keep freak4uxxx> scrolling.  I don't know if netcat (nc) will freak4uxxx> either... style="font-style: italic;"> <div> class="gmail_quote">On 6/21/05, class="gmail_sendername">Jeff Moyer <<a freak4uxxx> href="mailto:jmoyer@redhat.com">jmoyer(a)redhat.com</a>> freak4uxxx> wrote:<blockquote class="gmail_quote" freak4uxxx> style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt freak4uxxx> 0pt 0pt 0.8ex; padding-left: 1ex;"> ==> Regarding Re: [Wlug] freak4uxxx> HOWTO debug hard lockups; Andy Stewart <<a freak4uxxx> href="mailto:andystewart@comcast.net">andystewart(a)comcast.net</a>> freak4uxxx> adds: andystewart> -----BEGIN PGP SIGNED MESSAGE----- freak4uxxx> Hash: SHA1 andystewart> Jeff Moyer freak4uxxx> wrote: >> ==> Regarding Re: [Wlug] HOWTO debug hard freak4uxxx> lockups; Andy Stewart >> <<a freak4uxxx> href="mailto:andystewart@comcast.net">andystewart(a)comcast.net</a>> freak4uxxx> adds: >> andystewart> -----BEGIN PGP SIGNED freak4uxxx> MESSAGE----- Hash: SHA1 >> andystewart> Eric freak4uxxx> Martin wrote: >>>> In reguards to seeing freak4uxxx> messages on minicom, what logger do you freak4uxxx> have >>>> installed?  Can you just freak4uxxx> shovel kernel messages over to ttyS01?  eg freak4uxxx> >>>> sudo tailf /var/log/kernel freak4uxxx> ttyS01 >> andystewart> I did that per your freak4uxxx> suggestion and it works just fine. >> Umm, it works freak4uxxx> just fine so long as the system is up and freak4uxxx> running.  You >> really want the kernel to freak4uxxx> be printing directly to the console. >> Otherwise, freak4uxxx> when the system locks up and the NMI fires, you still freak4uxxx> won't >> get your messages over the serial freak4uxxx> console. >> >> Andy, it looked to me like freak4uxxx> you had things configured freak4uxxx> properly.  Indeed, >> I use a very similar freak4uxxx> setup all of the time.  The only difference is freak4uxxx> it >> works for me.  (I hate that freak4uxxx> phrase). >> >> I'm not sure what to suggest freak4uxxx> at this point.  If you do an alt-sysrq-h, >> freak4uxxx> does that at least print out over the serial freak4uxxx> console? >> >> freak4uxxx> -Jeff >> andystewart> HI Jeff, freak4uxxx> andystewart> If I do an alt-sysrq-h, I get the one freak4uxxx> line help on the serial andystewart> freak4uxxx> console.  If I do alt-sysrq-m to show memory, I see freak4uxxx> "SysRq : andystewart> Show Memory" ont the freak4uxxx> serial console, but nothing more (unless andystewart> I freak4uxxx> use Eric's trick).  If I go to runlevel 1, freak4uxxx> alt-sysrq-m has andystewart> the entire output on the freak4uxxx> serial console. You have all of the luck.  How freak4uxxx> about trying netconsole?  It's easy enough to freak4uxxx> setup.  On the host which will receive the logs, do freak4uxxx> something like this: nc -u -l -p 6666 On the freak4uxxx> problematic system, load the netconsole module: modprobe freak4uxxx> netconsole freak4uxxx> netconsole=@<ip-of-this-machine>/<ethX>,6666@<ip-of-server>/<MAC-address-of-server> freak4uxxx> You can try this or not, depending on whether you freak4uxxx> still experience crashes.  It sounds like the freak4uxxx> latest kernel fixed things right up for freak4uxxx> you, right? Oh well, good to have in your bag of freak4uxxx> tricks, I guess. freak4uxxx> -Jeff _______________________________________________ Wlug freak4uxxx> mailing list <a freak4uxxx> href="mailto:Wlug@mail.wlug.org">Wlug(a)mail.wlug.org</a> <a freak4uxxx> href="http://mail.wlug.org/mailman/listinfo/wlug">http://mail.wlug.org/mailman/listinfo/wlug freak4uxxx> </a> </blockquote></div>

June 22, 2005

Re: [Wlug] HOWTO debug hard lockups

by Eric Martin

Right, I forgot about that jeff. If you're running syslog-ng, you can go into /etc/syslog-ng/syslog-ng.conf and add a line: destination console_all { ("/dev/ttyS01"); }; although, I'm not sure if you're locking up if syslog-ng will keep scrolling. I don't know if netcat (nc) will either... On 6/21/05, Jeff Moyer <jmoyer(a)redhat.com> wrote: > > ==> Regarding Re: [Wlug] HOWTO debug hard lockups; Andy Stewart < > andystewart(a)comcast.net> adds: > > andystewart> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 > > andystewart> Jeff Moyer wrote: > >> ==> Regarding Re: [Wlug] HOWTO debug hard lockups; Andy Stewart > >> <andystewart(a)comcast.net> adds: > >> > andystewart> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 > >> > andystewart> Eric Martin wrote: > >>>> In reguards to seeing messages on minicom, what logger do you have > >>>> installed? Can you just shovel kernel messages over to ttyS01? eg > >>>> sudo tailf /var/log/kernel ttyS01 > >> > andystewart> I did that per your suggestion and it works just fine. > >> Umm, it works just fine so long as the system is up and running. You > >> really want the kernel to be printing directly to the console. > >> Otherwise, when the system locks up and the NMI fires, you still won't > >> get your messages over the serial console. > >> > >> Andy, it looked to me like you had things configured properly. Indeed, > >> I use a very similar setup all of the time. The only difference is it > >> works for me. (I hate that phrase). > >> > >> I'm not sure what to suggest at this point. If you do an alt-sysrq-h, > >> does that at least print out over the serial console? > >> > >> -Jeff > >> > > andystewart> HI Jeff, > > andystewart> If I do an alt-sysrq-h, I get the one line help on the serial > andystewart> console. If I do alt-sysrq-m to show memory, I see "SysRq : > andystewart> Show Memory" ont the serial console, but nothing more (unless > andystewart> I use Eric's trick). If I go to runlevel 1, alt-sysrq-m has > andystewart> the entire output on the serial console. > > You have all of the luck. How about trying netconsole? It's easy enough > to setup. On the host which will receive the logs, do something like this: > > nc -u -l -p 6666 > > On the problematic system, load the netconsole module: > > modprobe netconsole > netconsole=@<ip-of-this-machine>/<ethX>,6666@<ip-of-server>/<MAC-address-of-server> > > > You can try this or not, depending on whether you still experience > crashes. It sounds like the latest kernel fixed things right up for you, > right? > > Oh well, good to have in your bag of tricks, I guess. > > -Jeff > _______________________________________________ > Wlug mailing list > Wlug(a)mail.wlug.org > http://mail.wlug.org/mailman/listinfo/wlug >

June 22, 2005

Re: [Wlug] HOWTO debug hard lockups

by Jeff Moyer

==> Regarding Re: [Wlug] HOWTO debug hard lockups; Andy Stewart <andystewart(a)comcast.net> adds: andystewart> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 andystewart> Jeff Moyer wrote: >> ==> Regarding Re: [Wlug] HOWTO debug hard lockups; Andy Stewart >> <andystewart(a)comcast.net> adds: >> andystewart> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 >> andystewart> Eric Martin wrote: >>>> In reguards to seeing messages on minicom, what logger do you have >>>> installed? Can you just shovel kernel messages over to ttyS01? eg >>>> sudo tailf /var/log/kernel ttyS01 >> andystewart> I did that per your suggestion and it works just fine. >> Umm, it works just fine so long as the system is up and running. You >> really want the kernel to be printing directly to the console. >> Otherwise, when the system locks up and the NMI fires, you still won't >> get your messages over the serial console. >> >> Andy, it looked to me like you had things configured properly. Indeed, >> I use a very similar setup all of the time. The only difference is it >> works for me. (I hate that phrase). >> >> I'm not sure what to suggest at this point. If you do an alt-sysrq-h, >> does that at least print out over the serial console? >> >> -Jeff >> andystewart> HI Jeff, andystewart> If I do an alt-sysrq-h, I get the one line help on the serial andystewart> console. If I do alt-sysrq-m to show memory, I see "SysRq : andystewart> Show Memory" ont the serial console, but nothing more (unless andystewart> I use Eric's trick). If I go to runlevel 1, alt-sysrq-m has andystewart> the entire output on the serial console. You have all of the luck. How about trying netconsole? It's easy enough to setup. On the host which will receive the logs, do something like this: nc -u -l -p 6666 On the problematic system, load the netconsole module: modprobe netconsole netconsole=@<ip-of-this-machine>/<ethX>,6666@<ip-of-server>/<MAC-address-of-server> You can try this or not, depending on whether you still experience crashes. It sounds like the latest kernel fixed things right up for you, right? Oh well, good to have in your bag of tricks, I guess. -Jeff

June 21, 2005

Re: [Wlug] HOWTO debug hard lockups

by Andy Stewart

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Jeff Moyer wrote: > ==> Regarding Re: [Wlug] HOWTO debug hard lockups; Andy Stewart <andystewart(a)comcast.net> adds: > > andystewart> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 > > andystewart> Eric Martin wrote: >>>In reguards to seeing messages on minicom, what logger do you have >>>installed? Can you just shovel kernel messages over to ttyS01? eg sudo >>>tailf /var/log/kernel ttyS01 > > andystewart> I did that per your suggestion and it works just fine. > > Umm, it works just fine so long as the system is up and running. You > really want the kernel to be printing directly to the console. Otherwise, > when the system locks up and the NMI fires, you still won't get your > messages over the serial console. > > Andy, it looked to me like you had things configured properly. Indeed, I > use a very similar setup all of the time. The only difference is it works > for me. (I hate that phrase). > > I'm not sure what to suggest at this point. If you do an alt-sysrq-h, does > that at least print out over the serial console? > > -Jeff > HI Jeff, If I do an alt-sysrq-h, I get the one line help on the serial console. If I do alt-sysrq-m to show memory, I see "SysRq : Show Memory" ont the serial console, but nothing more (unless I use Eric's trick). If I go to runlevel 1, alt-sysrq-m has the entire output on the serial console. Later, Andy - -- Andy Stewart, Founder Worcester Linux Users' Group Worcester, MA, USA http://www.wlug.org -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFCuI64Hl0iXDssISsRAgYoAJwO2tnZkw6ox+URA61Lh16lyUhE4wCeOedC wQJZTh9CV8pUFPfEHkDYjw8= =H2Yg -----END PGP SIGNATURE-----

June 21, 2005

Yellow Dog Linux

by Stephen Ketcham

I've just set up my Mac G4 Powerbook to boot Yellow Dog Linux 4.0.1. (It dual boots, so it also runs Mac OS X.) is there anybody else on the list running Yellow Dog? Thanks, Steve

June 21, 2005

Re: [Wlug] HOWTO debug hard lockups

by Jeff Moyer

==> Regarding Re: [Wlug] HOWTO debug hard lockups; Andy Stewart <andystewart(a)comcast.net> adds: andystewart> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 andystewart> Eric Martin wrote: >> In reguards to seeing messages on minicom, what logger do you have >> installed? Can you just shovel kernel messages over to ttyS01? eg sudo >> tailf /var/log/kernel ttyS01 andystewart> I did that per your suggestion and it works just fine. Umm, it works just fine so long as the system is up and running. You really want the kernel to be printing directly to the console. Otherwise, when the system locks up and the NMI fires, you still won't get your messages over the serial console. Andy, it looked to me like you had things configured properly. Indeed, I use a very similar setup all of the time. The only difference is it works for me. (I hate that phrase). I'm not sure what to suggest at this point. If you do an alt-sysrq-h, does that at least print out over the serial console? -Jeff

June 21, 2005