On Thu, Mar 29, 2018 at 03:43:17PM +0800, Ken wrote: > Hi, > Recently, we found that when we bring a hot-plugged vCPU online on a VM > of Ubuntu server 17.10 64bit, which is running on the KVM platform, the VM > will be stuck. > > The VM's logs were as follows: > [ 97.704114] CPU2 has been hot-added > [ 97.704274] CPU3 has been hot-added > [ 117.464305] smpboot: Booting Node 0 Processor 2 APIC 0x2 > [ 117.464502] kvm-clock: cpu 2, msr 4:3ff55081, secondary cpu clock > [ 117.484689] TSC ADJUST compensate: CPU2 observed 249396676850 warp. > Adjust: 249396676850 > [ 217.494341] TSC ADJUST compensate: CPU2 observed 172 warp. Adjust: > 249396677022 Something is seriously messsed up with the KVM thing you're running... talk to the virt people, the TSC shouldn't do that.
