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From: Jan Beulich <jbeulich@suse.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: "osstest service owner" <osstest-admin@xenproject.org>,
	"Roger Pau Monné" <roger.pau@citrix.com>,
	xen-devel@lists.xenproject.org,
	"Ian Jackson" <iwj@xenproject.org>
Subject: Re: Regressed XSA-286, was [xen-unstable test] 161917: regressions - FAIL
Date: Mon, 17 May 2021 12:59:01 +0200	[thread overview]
Message-ID: <f365c8f9-362c-f7f5-6ed4-34131a1dce63@suse.com> (raw)
In-Reply-To: <e8fae962-1a5b-cc91-d429-a716b009f062@suse.com>

On 17.05.2021 10:43, Jan Beulich wrote:
> On 13.05.2021 22:15, Andrew Cooper wrote:
>> Second, the unexplained OSSTest behaviour.
>>
>> When I repro'd this on pinot1, test-pv32pae-xsa-286 failing was totally
>> deterministic and repeatable (I tried 100 times because the test is a
>> fraction of a second).
>>
>> From the log trawling which Ian already did, the first recorded failure
>> was flight 160912 on April 11th.  All failures (12, but this number is a
>> few flights old now) were on pinot*.
>>
>> What would be interesting to see is whether there have been any passes
>> on pinot since 160912.
>>
>> I can't see any reason why the test would be reliable for me, but
>> unreliable for OSSTest, so I'm wondering whether it is actually
>> reliable, and something is wrong with the stickiness heuristic.
> 
> Isn't (un)reliability of this test, besides the sensitivity to IRQs
> and context switches, tied to hardware behavior, in particular TLB
> capacity and replacement policy? Aiui the test has
> 
>     xtf_success("Success: Probably not vulnerable to XSA-286\n");
> 
> for the combination of all of these reasons.

I've just done a dozen runs on my Skylake - all reported SUCCESS.

Jan


  reply	other threads:[~2021-05-17 10:59 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-13  3:56 osstest service owner
2021-05-13 20:15 ` Regressed XSA-286, was " Andrew Cooper
2021-05-17  8:43   ` Jan Beulich
2021-05-17 10:59     ` Jan Beulich [this message]
2021-06-16  8:48   ` Jan Beulich
2021-06-16 15:43     ` Andrew Cooper
2021-06-17 11:56       ` Jan Beulich
2021-06-17 13:05         ` Ian Jackson
2021-06-17 14:40           ` Jan Beulich
2021-06-17 14:49             ` Ian Jackson
2021-06-17 14:55               ` Jan Beulich
2021-06-28 12:35           ` Ping: " Jan Beulich
2021-06-17 21:26         ` Stefano Stabellini

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