Hi, > > > On August 9, 2011, Avi Kivity wrote: > > > > Yikes. Please trace such a hang according to > > > > http://www.linux-kvm.org/page/Tracing. I have observed the same problem multiple times now and a college of mine also. He's able to reproduce this problem every time. For me it manifests on the serial console hanging after reboot, for him it is after the reboot when a process does a sleep(). The problem occurrs with clocksource=kvm-clock. After the reboot tsc is disabled with the message "Clocksource tsc unstable (delta = 137303562 ns)" and is no longer shown in available_clocksource. When booting with clocksouce=hpet, the system does not hang. Our trace-cmd data is available from <http://download.univention.de/download/temp/kvm-clock/kvm-clock.tar.bz2> including the trace.dat. show-task-states_portmap.txt and show-task-states_syslogd.txt contain the captures output of Alt-SysRq-t. Both host and guest are running an 2.6.32.x amd64 kernel, qemu is 0.14.1. The system is currently not in production and can be used for experiments. Sincerely Philipp Hahn PS: This issue is tracked in out German bugtracker at <https://forge.univention.org/bugzilla/show_bug.cgi?id=23258> -- Philipp Hahn Open Source Software Engineer hahn@xxxxxxxxxxxxx Univention GmbH Linux for Your Business fon: +49 421 22 232- 0 Mary-Somerville-Str.1 D-28359 Bremen fax: +49 421 22 232-99 http://www.univention.de/
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