On Thu, Mar 17, 2016 at 01:54:36PM -0400, Josh Boyer wrote: > Hi Thomas, > > We've had a report [1] of the mainline kernel crashing on a single-cpu > QEMU machine (not kvm) in Fedora. It looks as if the emulated machine > is failing to provide a TSC and the calibrate_delay_is_known function > is passing NULL to cpumask_any_but for the mask parameter. At least > that's all I've been able to discern thus far. > > I was wondering if you had any insight into this issue, given your > recent commit to change calibrate_delay_is_known to use > topology_core_cpumask. The backtrace is below.
Thanks for reporting this upstream Josh. I've added to the bug a simple test script that reproduces the issue, not 100% reliably by any means, but some of the time. See: https://bugzilla.redhat.com/show_bug.cgi?id=1318596#c6 Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-df lists disk usage of guests without needing to install any software inside the virtual machine. Supports Linux and Windows. http://people.redhat.com/~rjones/virt-df/
