Matched Key Count equals 0 but the CWA shows 1 risk encounter #1106

ferdinand · 2020-09-01T20:10:05Z

Avoid duplicates

Bug is not mentioned in the FAQ
Bug is not already reported in another issue

Describe the bug

After todays check the CWA showed me 1 risk encounter. Hence, the Matched Key Count for todays check should be at least 1 as well but it's 0.

Expected behaviour

To my understanding the number of risk encounters within the app can be lower than the Matched Keys Count within the system settings but not the other way around.

Steps to reproduce the issue

Here's my "Exposure Checks" export file: https://paste.ubuntu.com/p/J7jNqqQMF8/

Technical details

iOS Version: iOS 14 Public Beta 6
Device: iPhone X

Additional context

A friend of mine – also on the iOS 14 Public Beta – experienced the same behaviour today.

It's still possible that I understand something terribly wrong.

Internal Tracking ID: EXPOSUREAPP-2639

Ein-Tim · 2020-09-01T20:24:11Z

Hey, I can tell you that you don't understand anything wrong here, the matching of the keys is done by the API from Apple/Google, so without an Match shown there, it is practically not possible that the App shows an exposure.

So or so the iOS 14 Beta, isn't supported, so maybe it is an Beta issue, or does somebody, who is not on an Beta-Version have this Issue too?

daimpi · 2020-09-02T03:00:00Z

Something weird is going on in your ENF log:

Doesn't seem like a well formed entry… not really sure what to make of this though tbh 🤷

Ein-Tim · 2020-09-02T09:24:41Z

@daimpi I think this is how the ENF log now looks under iOS 13.7 and above (iOS 14 Beta)
See my: #934 (comment)

ferdinand · 2020-09-02T10:14:28Z

Here's my friend's "Exposure Checks" export: https://paste.ubuntu.com/p/fhS5pXtDfS/ and a screenshot of his CWA:

ferdinand · 2020-09-02T10:22:37Z

So or so the iOS 14 Beta, isn't supported, so maybe it is an Beta issue, or does somebody, who is not on an Beta-Version have this Issue too?

I'm well aware that the iOS 14 beta is not officially supported. However, as the release of the final version comes closer, the devs might be still interested to look into it.

Ein-Tim · 2020-09-02T10:24:58Z

I'm well aware that the iOS 14 beta is not officially supported. However, as the release of the final version comes closer, the devs might be still interested to look into it.

Ok, this wasn't a blame or something just wanted to inform you (but you knew it ,so; I'm sorry 🙂)

daimpi · 2020-09-02T11:25:00Z

@Ein-Tim

@daimpi I think this is how the ENF log now looks under iOS 13.7 and above (iOS 14 Beta)
See my: #934 (comment)

Yes I saw that the format changed (thanks for sharing your log 🙂), but that's not what I meant: if I look at your entries, they look like most of @ferdinand's normal entries:

Normal entry	Non-normal entry

But as you can see above, there seems to be some payload missing in @ferdinand's non-normal entries (between the red markers I inserted) while I couldn't find such non-normal entries in your log.

Ein-Tim · 2020-09-02T11:29:32Z

@daimpi
Now I know what you mean...
I have an iPhone 6s with CWA on iOS 14 Beta 6, I will take a look at the logs there... (but the CWA first have to do a check, it isn't installed long enough...)
Will let you know what's there and if you like to, I could share this log also 👍

Ein-Tim · 2020-09-02T11:41:40Z

I've now taken a quick look at the ENF log from @ferdinand's friend, and there I can't find any non-normal entrys, maybe I've overlooked something, did you find something @daimpi?

daimpi · 2020-09-02T12:42:07Z

@Ein-Tim

Will let you know what's there and if you like to, I could share this log also 👍

sounds good 👍
I currently don't really know what to make of those entries tbh… especially b/c @ferdinand's entries on the Sept 1st all seem fine and show 0 matches, which under normal circumstances should lead to CWA showing 0 exposures as well.

I've now taken a quick look at the ENF log from @ferdinand's friend, and there I can't find any non-normal entrys, maybe I've overlooked something, did you find something @daimpi?

I've also checked this log and I didn't find any non-normal entries there. Also: there were again no matches whatsoever, which makes it less likely that the abnormalities seen in @ferdinand's log have anything to do with the problem.

@ferdinand

To my understanding the number of risk encounters within the app can be lower than the Matched Keys Count within the system settings but not the other way around.

It is actually even more stringent than that: There should be a 1-to-1 relationship between what is shown in the app and the exposure log for that day.

ndegendogo · 2020-09-02T22:03:30Z

@ferdinand do you remember on which day did you install the iOS 14 beta?
I see a change in the formatting style in your json file between 26 Aug and 27 Aug - could that be related to your upgrade?
Also I see no entry (old formatting style) on 25 Aug, and two empty groups (new formatting style) on 28 Aug 13:33 and 30 Aug 21:35.

ferdinand · 2020-09-03T08:05:12Z

@ndegendogo I've upgraded to iOS 14 pretty soon after Public Beta 4 was released. However, the change could be related to the upgrade to Public Beta 6.

mss1010 · 2020-09-04T09:13:31Z

Hello, two days ago I installed iOS 13.7 and today I noticed exactly the same bug.
Zero mathed keys shown in the iOS Settings, but one low risk encounter in CWA.

Ein-Tim · 2020-09-04T09:14:29Z

@mss1010
Could you share your Exposure Log?
Thanks!

mss1010 · 2020-09-04T09:19:58Z

yes, here it is: https://pastebin.com/7BdgTGrC

What I also find strange is, that since the new format with 13.7 I have only 13 files per day.

Ein-Tim · 2020-09-04T09:27:57Z

@mss1010

First of all thanks for sharing the log, after taking a quick look I couldn't find any non-normal entries, so I think @daimpi this comes from something other. With the first person now on iOS 13.7 having this behaviour I think it is time to take a closer look at this @thomasaugsten @SebastianWolf-SAP @abro1i @svengabr

About the only 13 files per day I opend #1123

tCode83 · 2020-09-04T09:41:09Z

I just noticed the same behavior on my phone. iOS 13.7., CWA 1.3.0. Exposure Log attached.

Exposure Log File

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SebastianWolf-SAP · 2020-09-04T10:06:31Z

@Ein-Tim We are aware of the changes and currently preparing some material for explanation and additional details. No ETA yet as we also need to align and clarify with the experts.

A small disclaimer from my side though: After some weeks vacation, I'm now slowly transitioning to other projects and other people have already and will continue to take over our communication here and elsewhere. But you already mentioned some of the colleagues as well I see. ;)

thomasaugsten · 2020-09-04T10:37:10Z

We will test this internally and also check with Apple.

ferdinand · 2020-09-04T10:39:02Z

@SebastianWolf-SAP Aware of the changes or aware of a potential bug (i.e., false positive)? I hope SAP is not (again) underestimating the adverse publicity this bug could cause for the app's reputation. If this is really a bug it's urgent.

Tho-Mat · 2020-09-04T11:03:30Z

@mss1010 @Ein-Tim
about the only 13 key-files look here:
#1123 (comment)
mss1010 downloads the key-files at 0:15

SebastianWolf-SAP · 2020-09-04T11:24:11Z

@ferdinand Particularly aware of some changes with iOS 13.7 (and then potentially 14 Beta as well) and how they might affect our app. And you can be sure: Nobody wants yet another incident where we had discussions on GitHub before but didn't analyze/prioritize it accordingly.

Ein-Tim · 2020-09-04T11:33:05Z

@SebastianWolf-SAP

Ok thanks for the Information!
Thanks for all the great work from you, all the best for your future projects! ❤️

ferdinand · 2020-09-04T11:57:56Z

@SebastianWolf-SAP That sounds good to me. Thanks for your great work and best of luck in your future endeavors!

The inept media coverage of the background app refresh incident made me really sad. What made me even more sad is that this led to the withdrawal of the development from the public.

SebastianWolf-SAP · 2020-09-04T12:14:59Z

@ferdinand @Ein-Tim Thanks for the kind words, really appreciated!

@ferdinand Unfortunately, I can't comment on internals that much. However, I can say that your conclusion is not really accurate - there have simply been a lot of changes behind the curtain also due to things which we can't influence... It was just a temporal correlation but not driven by the background update stuff why we needed to change the modus operandi a bit. It's simply not a traditional OSS project as features and the things which are developed are mainly driven by our clients. The development is still there and listening to you, all changes are still done in the public and we are also keen on improving the process to become more transparent.

thomasaugsten · 2020-09-05T10:13:31Z

We can reproduce this behavior on iOS 13.7 the API returns a correct machtCount of 1 but the API is not writing this number in exposure log in the iOS settings. It looks for us that the API is not reporting false positive we are in contact with Apple to get a better understanding of this topic.

Tho-Mat · 2020-09-05T10:15:56Z

@thomasaugsten
what do you mean with "false positive".

thomasaugsten · 2020-09-05T10:18:09Z

ferdinand brings up the idea maybe the API returns wrongly the value 1 but writes the correct value of 0 in the log.
But we simulate a exposure an the value of the API is correct and not the value in the log.

Tho-Mat · 2020-09-05T10:22:11Z

So there was a match, but it is not reported in the log?

jajoho · 2020-10-09T15:54:54Z

@Ein-Tim Thanks! I haven't read all of it. It is a bit too much ;)

OttoVerbraucher · 2020-10-11T20:55:48Z

This Bluetooth-Low-Energy (BLE) is NOT a technology for high-precision measurement of distance - do you mean this?

No. Nothing is perfect, I know. My point is, the app is going to stop and doing nothing with the BLE measurements ("Risiko-Ermittlung gestoppt"). For the user then there is zero difference to not having the app. See #916, #1144, #1153.

ndegendogo · 2020-10-11T22:39:56Z

@OttoVerbraucher yes, true.

Are you affected by such an issue?
If yes, I recommend that you comment on one of those tickets you mentioned, and give details about your device type, iOS version and cwa version.
The focus of this ticket here is different.

Bernhard387 · 2020-10-12T17:23:36Z

Hey everybody,
Puh ... what a ... discussion.
I understood that it will be fixed in iOS 14.02.

For the layman speaking it means that the "Abgeglichene Schlüssel 0" issue is a logging issue only?

The app properly notifies matching positive keys? So what matters is the encounters reported by the "app"?

Sorry for warming this up. I was just hoping to get more information on details about the suspicious potential contacts (which are diffucult to explain, my only explanation so far is the locker in a fitness studio where I left my mobile for about 2 hours, stupidly switched on. I am still waiting for my PCR test result.

That's the only reason why I, as a layman, looked into the "logfile" at all.

Thanks for your efforts to make this world a safer place.

Regards
Bernhard

Ein-Tim · 2020-10-12T17:31:34Z

For the layman speaking it means that the "Abgeglichene Schlüssel 0" issue is a logging issue only?

Correct, this is a logging Issue.

The app properly notifies matching positive keys? So what matters is the encounters reported by the "app"?

Also correct, the Encounters by the App are the ones which matter and the app is properly notify if there was a match.

daimpi · 2020-10-12T18:09:19Z

Hi @Bernhard387

For the layman speaking it means that the "Abgeglichene Schlüssel 0" issue is a logging issue only?

Yes this is correct.
Unfortunately there is nothing of additional value the log would tell you even if it had been working properly… the only additional thing you could find out there is the day when the ppl you had contact with uploaded their keys (e.g. by using EN analyzer).

But the much more interesting info (the day of your encounter) is already visible for you b/c you actually had a red encounter (even though the way this is presented in CWA has definitely room for improvement, see here and here).

thomasaugsten · 2020-10-16T12:14:08Z

This issue is now fixed in iOS 14.1

Ein-Tim · 2020-10-21T12:34:20Z

iOS 14.1 has been released and it solves this Issue.
If you can confirm this @ferdinand, I think the Issue can be closed

ferdinand · 2020-10-21T14:30:08Z

@Ein-Tim Since I'm already on the iOS 14.2 Public Beta I can't confirm that 14.1 fixes this issue. So I'll leave it to the team to close it.

sepehr · 2020-10-21T16:16:39Z

FTR, I've just upgraded to 14.1 and I'm still seeing a low-risk encounter with all my exposure logs showing Matched Key Count of 0.

https://pastebin.com/V00Ka7hw

daimpi · 2020-10-21T16:18:43Z

@sepehr did your CWA perform an update/sync since you upgraded to iOS 14.1? If not you'll have to wait until the next update/sync happens, to see the fix in action.

sepehr · 2020-10-21T16:44:46Z

Thank you for pointing it out Daniel. No, it hasn't yet. I'll report back as soon as it does. @daimpi

sepehr · 2020-10-21T21:30:34Z

True, sync is done. Now I see Matched Key Count of 1 for today's exposure log.

So, does it mean it wasn't a false positive and I actually had an encounter? or am I totally misguided here?

daimpi · 2020-10-21T21:33:21Z

@sepehr

So, does it mean it wasn't a false positive and I actually had an encounter?

Yes, exactly! This means you actually had an encounter.

ghost · 2020-10-23T11:07:09Z

+++ Update +++
Didn't update to 14.1. yet, so this error came up. Thank you @jajoho for catching my mistake.

I am confused as well.

The app shows "9 encounters with low risk" but the exported exposure log have a match count of 0 (see export here: https://pastebin.com/T7qmUZLs)

Running on iOS 14.0.1. with the Corona Warn App version 1.5.1 (1).

jajoho · 2020-10-23T11:11:06Z

@adrian-cares You need to update iOS to 14.1. The issue was resolved with the latest update.

ferdinand added the bug Something isn't working label Sep 1, 2020

This was referenced Oct 12, 2020

[iOS 13.6] After updating to iOS 13.6, consistently only 13 instead 14 sets of data per day appear in the encounter check log #921

Closed

iOS "Begegnungsüberprüfung" "Ausgetauschte Schlüssel" https://www.coronawarn.app/de/faq/#keys_matches #1333

Closed

ghost mentioned this issue Oct 13, 2020

Koronavilkku reports exposure but no key matches exist in logs THLfi/koronavilkku-ios#40

Closed

danielvonmitschke mentioned this issue Oct 17, 2020

Several low risk encounters shown despite low infection rate #1361

Closed

2 tasks

daimpi mentioned this issue Oct 20, 2020

Update to 1.5.0 turns 7 day old high risk encounters to low risk #1365

Closed

thomasaugsten closed this as completed Oct 21, 2020

felixlen mentioned this issue Oct 24, 2020

iOS: not working felixlen/ena_log#4

Closed

This was referenced Oct 25, 2020

contact count and matching keys doesn't match, 5 contacts #1403

Closed

Behaviour of app after risk encounter #1405

Closed

daimpi mentioned this issue Nov 2, 2020

Number of risk encounters increasing although the number should be declining #1389

Closed

Ein-Tim mentioned this issue Nov 6, 2020

Malfunction when using two iPhones at the Same Time / parallel #1469

Closed

Ein-Tim mentioned this issue Nov 17, 2020

Wrong number of encounters --> matchescount 0 #1525

Closed

Ein-Tim mentioned this issue Jan 12, 2021

App shows two encounters, json file doesn't ? #1775

Closed

Ein-Tim mentioned this issue Feb 3, 2021

[CWA-Documentation-Github] CODEOWNERS includes @tkowark corona-warn-app/cwa-documentation#440

Closed

Matched Key Count equals 0 but the CWA shows 1 risk encounter #1106

Matched Key Count equals 0 but the CWA shows 1 risk encounter #1106

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