Messages in this thread | | | Subject | Re: [PATCH] KVM: X86: Fix softlockup when get the current kvmclock timestamp | From | Paolo Bonzini <> | Date | Mon, 6 Nov 2017 11:21:09 +0100 |
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On 06/11/2017 11:06, Wanpeng Li wrote: > 2017-11-06 17:29 GMT+08:00 Paolo Bonzini <pbonzini@redhat.com>: >> 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.
Is kvm_get_time_scale getting into an infinite loop then? That would be the actual bug.
Paolo
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