Crash upon accepting voice call

[opusforlife2]

Steps to reproduce

Element completely crashed when I accepted a voice call just now. I don't know if it's reproducible yet.

Specifically, the crash occurred when the call status changed to "Call connecting..."

Logs:

FATAL EXCEPTION: LIVE_ENTITY_BACKGROUND
Process: im.vector.app, PID: 12473
java.util.ConcurrentModificationException
	at java.util.ArrayList$Itr.next(ArrayList.java:860)
	at org.matrix.android.sdk.internal.session.call.CallEventProcessor.onPostProcess(CallEventProcessor.kt:2)
	at org.matrix.android.sdk.internal.database.EventInsertLiveObserver$onChange$2.invokeSuspend(EventInsertLiveObserver.kt:11)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:3)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:18)
	at android.os.Handler.handleCallback(Handler.java:883)
	at android.os.Handler.dispatchMessage(Handler.java:100)
	at android.os.Looper.loop(Looper.java:214)
	at android.os.HandlerThread.run(HandlerThread.java:67)

Outcome

What did you expect?

For the voice call to begin normally.

And for Element to offer to send a crash report upon restart.

What happened instead?

Neither. Element just crashed. The logs I've caught were through Scoop, so I've selected "No" for logs.

Your phone model

Xiaomi Mi 5

Operating system version

Android 10 (LOS 17.1)

Application version and app store

1.4.2 (F-Droid)

Homeserver

No response

Will you send logs?

No

---

EDIT by @ouchadam

We're also getting reports in the play store console with the exact same stacktrace

Occurrences (30 days)	Total Occurrences	Impacted users (lifetime)
143	149	125

https://play.google.com/console/u/0/developers/{redacted}/app/{redacted}/vitals/crashes/3c579fd0/details?installedFrom=PLAY_STORE&days=30

[opusforlife2]

Hello triage team.

[ouchadam]

marked as uncommon whilst there aren't any other reports, ConcurrentModificationException will be tricky to reproduce but we can definitely guard against it

it also looks like the backing list is accessed from multiple threads https://github.com/vector-im/element-android/blob/develop/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/call/CallEventProcessor.kt

[ouchadam]

I've found the same crash in the play store console, have edited the issue description to include the current stats

[ouchadam]

fixed in 1.4.14