[Bug 216177] kvm-unit-tests vmx has about 60% of failure chance

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216177

--- Comment #6 from Sean Christopherson (seanjc@google.com) ---
On Tue, Jun 28, 2022, bugzilla-daemon@kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=216177
> 
> --- Comment #5 from Nadav Amit (nadav.amit@gmail.com) ---
> > On Jun 27, 2022, at 6:19 PM, bugzilla-daemon@kernel.org wrote:
> > 
> > https://bugzilla.kernel.org/show_bug.cgi?id=216177
> > 
> > --- Comment #3 from Yang Lixiao (lixiao.yang@intel.com) ---
> > (In reply to Nadav Amit from comment #2)
> >>> On Jun 27, 2022, at 5:28 PM, bugzilla-daemon@kernel.org wrote:
> >>> 
> >>> https://bugzilla.kernel.org/show_bug.cgi?id=216177
> >>> 
> >>> Sean Christopherson (seanjc@google.com) changed:
> >>> 
> >>>          What    |Removed                     |Added
> >>> 
> >>
> ----------------------------------------------------------------------------
> >>>                CC|                            |seanjc@google.com
> >>> 
> >>> --- Comment #1 from Sean Christopherson (seanjc@google.com) ---
> >>> It's vmx_preemption_timer_expiry_test, which is known to be flaky (though
> >>> IIRC
> >>> it's KVM that's at fault).
> >>> 
> >>> Test suite: vmx_preemption_timer_expiry_test
> >>> FAIL: Last stored guest TSC (28067103426) < TSC deadline (28067086048)
> >> 
> >> For the record:
> >> 
> >>
> https://lore.kernel.org/kvm/D121A03E-6861-4736-8070-5D1E4FEE1D32@gmail.com/
> > 
> > Thanks for your reply. So this is a KVM bug, and you have sent a patch to
> kvm
> > to fix this bug, right?
> 
> As I noted, at some point I did not manage to reproduce the failure.
> 
> The failure on bare-metal that I experienced hints that this is either a test
> bug or (much less likely) a hardware bug. But I do not think it is likely to
> be
> a KVM bug.

Oooh, your failure was on bare-metal.  I didn't grok that.  Though it could be
both a hardware bug and a KVM bug :-)

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