Actually, I managed it in dom0 today too. I ran a cpu,disk,mem and network stress test on dom0 and received a big delta clocksource change after 20-30 mins, then the machine hung. The system time was correct when i started the test, so my ntp service didn't cause this.
I've been seeing this complete hang a couple of times in the last week on machines or two but only managed to catch this clocksource message by enabling remote syslogging as it never seems to get written to disk. I've seen it on a machine with no guests running and no load whatsoever too. No panic messages either btw. Checked on the console too. xen01 kernel: clocksource/0: Time went backwards: delta=-6164329055846119597 shadow=9515037682421 offset=888776 All these on Dell PowerEdge 1950 machines (not tested on other hardware). I repeated it just now with only a network stress test (iperf). I got the following from the remote syslog then the machine hung again. Oct 1 11:44:56 xen01 kernel: clocksource/0: Time went backwards: delta=-6164321217525387920 shadow=711006713466 offset=4381314 Oct 1 11:44:56 xen01 kernel: clocksource/0: Time went backwards: delta=-6164321217525346621 shadow=711006713466 offset=4422132 Oct 1 11:44:56 xen01 kernel: clocksource/0: Time went backwards: delta=-6164321217525314134 shadow=711006713466 offset=4454408 Oct 1 11:44:56 xen01 kernel: clocksource/0: Time went backwards: delta=-6164321217525288215 shadow=711006713466 offset=4480460 Oct 1 11:44:56 xen01 kernel: clocksource/0: Time went backwards: delta=-6164321217524058472 shadow=711006713466 offset=5710035 Oct 1 11:44:56 xen01 kernel: clocksource/0: Time went backwards: delta=-6164321217524007717 shadow=711006713466 offset=5760868 Oct 1 11:44:56 xen01 kernel: clocksource/0: Time went backwards: delta=-6164321217523985997 shadow=711006713466 offset=5782540 Oct 1 11:44:56 xen01 kernel: clocksource/0: Time went backwards: delta=-6164321217523967085 shadow=711006713466 offset=5801481 Oct 1 11:44:56 xen01 kernel: clocksource/0: Time went backwards: delta=-6164321217522807718 shadow=711006713466 offset=6960795 Oct 1 11:44:56 xen01 kernel: clocksource/0: Time went backwards: delta=-6164321217522784542 shadow=711006713466 offset=6983995 -- Xen guest suspend causes clock to stop https://bugs.launchpad.net/bugs/146924 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
