2017-11-06 17:29 GMT+08:00 Paolo Bonzini <pbonzini@xxxxxxxxxx>: > On 06/11/2017 01:55, Wanpeng Li wrote: >> This can be reproduced when running kvm-unit-tests/hyperv_stimer.flat and >> cpu-hotplug stress simultaneously. kvm_get_time_scale() takes too long which >> results in softlockup. > > Apart from the pr_debug, kvm_get_time_scale should take less than a > microsecond. The patch is fine, but can you confirm that pr_debug is > the culprit? I can still encounter softlockup after removing the pr_debug. Regards, Wanpeng Li
