Fenix: FNX2-13669 ⁃ [Bug] java.lang.IndexOutOfBoundsException: at java.util.ArrayList.get(ArrayList.java)

[kbrosnan]

This looks to be the top crash in the 20200622093309 Nightly.

Stacktrace

java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
    at java.util.ArrayList.get(ArrayList.java:437)
    at mozilla.components.browser.search.SearchEngineManager.getProvidedDefaultSearchEngineAsync(SearchEngineManager.kt:7)
    at mozilla.components.browser.search.SearchEngineManager.getDefaultSearchEngineAsync(SearchEngineManager.kt:7)
    at mozilla.components.browser.search.SearchEngineManager$getDefaultSearchEngineAsync$1.invokeSuspend(Unknown Source:12)
    at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:3)
    at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:21)
    at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:1)
    at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:11)

• Android device: ?
• Fenix version: 20200622093309 0.0a1 Nightly

[kbrosnan]

Hm @pocmo filed https://github.com/mozilla-mobile/android-components/issues/5842

[kbrosnan]

• Sentry issue: FENIX-FENNEC-NIGHTLY-AG
• https://crash-stats.mozilla.org/signature/?product=Fenix&signature=java.lang.IndexOutOfBoundsException%3A%20at%20java.util.ArrayList.get%28ArrayList.java%29
• BZ-1648146

[liuche]

This could be related to #9935 changes

[liuche]

I'll file this other issue: https://sentry.prod.mozaws.net/operations/fenix-nightly/issues/8870448/?query=is%3Aunresolved

[liuche]

We think this will also be fixed by #12081

[lindongbin]

https://crash-stats.mozilla.org/report/index/8cd6f146-2dc6-4f2c-a477-5b2140200703

null (Build #2015749827)
AC: 48.0.3, ce6247fb8
GV: 79.0-20200629163142
AS: 61.0.7
Friday 7/3 @ 8:43 AM

[pocmo]

Looks like this made the top crasher list.

The last minute search changes really had a ripple effect and caused some issues. :( I hope we can try to get rid of the band-aid eventually.

[st3fan]

I put the 79 Release Blocker label on this because this is a very high frequency startup crash.

Looping in @Mugurell as this may be related to #11875

[st3fan]

Quick note: this crash is trending down in Sentry, but I think that is a false sign. I think a LOT of people hit this either at first run or a few times at startup, and then the situation resolved itself. That however does not change the fact that this is a high frequency startup crash. I've seen a number of reports on Reddit where people say they can't start the app, and this is probably one the reasons.

[Mugurell]

Indeed, I'm thinking that fixing #11875 (which is another effect for probably the same underlying issue) would also get to resolve this and a bunch recent others related to search engines.

[liuche]

Since we think the fix for #11875 may also fix this one, let's see if we can make sure this isn't still a problem.

[sv-ohorvath]

While testing the fix for #11875 I didn't encounter any crashes on 79.0-beta6. @liuche Should I close this or do you want to continue monitoring the crash rates?

[liuche]

We released beta.8 and beta.9 today and I haven't seen any issues in Sentry, so let's close this now. Can reopen if it shows up again, but the last crashes I've seen have been from beta.3.

[Mugurell]

Closing based on https://github.com/mozilla-mobile/fenix/issues/11906#issuecomment-660271105