Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.6 kernel[0].
If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. Once testing of the upstream kernel is complete, please mark this bug as "Confirmed". Thanks in advance. [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.6-rc4-wily/ ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete ** Tags added: kernel-da-key wily -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1567167 Title: Ubuntu 15.10: tsc_offset is error for hot-plugged vcpu. Status in linux package in Ubuntu: Incomplete Bug description: 1. when hot plug vcpu, KVM will call kvm_write_tsc set the new vcpu's tsc_offset to host tsc. The new vcpu's tsc_offsets is greatly different from preallocated vcpu's tsc_offset. 2. For redhat 6.x, the vm will show warning and turn off TSC clock. kernel: CPU 1 got hotplugged kernel: kvm-clock: cpu 1, msr 0:282367c1, secondary cpu clock kernel: TSC synchronization [CPU#0 -> CPU#1]: kernel: Measured 150076598781 cycles TSC warp between CPUs, turning off TSC clock. kernel: Marking TSC unstable due to check_tsc_sync_source failed 3. I think should set the new vcpu's tsc_offset to kvm->arch.cur_tsc_offset. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1567167/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp