Hi Kent, Am 03.01.2013 um 23:25 schrieb Kent A. Reed: > [Oops - I responded to Joachim and forgot about the list. This is a resend.] > > On 1/3/2013 3:42 PM, Joachim Franek wrote: >>> I have also observed the crashes after about 5min. >>> But after several reboots I was able to run >>> the cnc demo programm from sim/axis/axis_mm. > > Hi, Joachim. I'm the KAR. I've traced my crashes to the way my > BeagleBone and DHCP server are interacting. I'm not sure yet what the > root cause is but I am sure it's not in Michael's > LinuxCNC/Xenomai/Ubuntu system since the same occurs when I network-boot > a Ubuntu Quantal system from the same server. It does not happen when I > boot /load everything directly from microSD card. > > When you say "after several reboots" do you mean your crashes go away? I > never saw that. My systems reliably "die" at about 4 minutes (I just run > 'top', wait for the lockup, and read the last recorded time) and I can > get a different lifetime by changing the default client-lease time in > the DHCP server. Having a lease expire should not make a client lock up. > Like I said, I'm not sure what the root cause is yet.
to nail this, tcpdump might be helpful - 'sudo apt-get install tcpdump' if needed useful idioms: trace traffic from/to a specific MAC address: tcpdump -i br0 -vvv ether host 00:18:31:8e:ee:41 more specific filters: DHCP: tcpdump -i br0 -vvv port bootpc or port bootps TFTP: tcpdump -i br0 -vvv port tftp NFS mount issues: tcpdump -i br0 -vvv port 111 or port 2049 for tracking NFS mount problems, this might help: http://stromberg.dnsalias.org/~strombrg/NFS-troubleshooting-2.html here's a trace of the start of the DHCP exchange of a beaglebone with the DHCP server: alix:~# tcpdump -i br0 port bootps -vvv tcpdump: listening on br0, link-type EN10MB (Ethernet), capture size 65535 bytes 08:33:00.910137 IP (tos 0x0, ttl 255, id 1, offset 0, flags [DF], proto UDP (17), length 328) 0.0.0.0.bootpc > 255.255.255.255.bootps: [no cksum] BOOTP/DHCP, Request from 00:18:31:8f:4f:e4 (oui Unknown), length 300, xid 0x318f6415, secs 5, Flags [none] (0x0000) Client-Ethernet-Address 00:18:31:8f:4f:e4 (oui Unknown) file "/boot/uImage" Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: Discover MSZ Option 57, length 2: 576 Parameter-Request Option 55, length 3: Subnet-Mask, Default-Gateway, Domain-Name-Server END Option 255, length 0 PAD Option 0, length 0, occurs 47 08:33:00.911150 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328) alix-intern.stiwoll.mah.priv.at.bootps > bb1.stiwoll.mah.priv.at.bootpc: [udp sum ok] BOOTP/DHCP, Reply, length 300, xid 0x318f6415, secs 5, Flags [none] (0x0000) Your-IP bb1.stiwoll.mah.priv.at Server-IP alix-intern.stiwoll.mah.priv.at Client-Ethernet-Address 00:18:31:8f:4f:e4 (oui Unknown) file "nfsroot/bb-ubuntu/boot/vmlinuz-3.2.21-xenomai+" Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: Offer Server-ID Option 54, length 4: alix-intern.stiwoll.mah.priv.at Lease-Time Option 51, length 4: 36000 Subnet-Mask Option 1, length 4: 255.255.255.224 Default-Gateway Option 3, length 4: alix-intern.stiwoll.mah.priv.at Domain-Name-Server Option 6, length 8: alix-intern.stiwoll.mah.priv.at,mail.mah.priv.at END Option 255, length 0 PAD Option 0, length 0, occurs 22 etc etc - Michael ------------------------------------------------------------------------------ Master HTML5, CSS3, ASP.NET, MVC, AJAX, Knockout.js, Web API and much more. Get web development skills now with LearnDevNow - 350+ hours of step-by-step video tutorials by Microsoft MVPs and experts. SALE $99.99 this month only -- learn more at: http://p.sf.net/sfu/learnmore_122812 _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
