Crash when granting permission to schedule exact alarms

Checklist

• I have used the search function to see if someone else has already submitted the same bug report.
• I will describe the problem with as much detail as possible.

App

Thunderbird for Android

App version

8.0

Where did you get the app from?

None

Android version

various

Device model

No response

Steps to reproduce

We received this crash via the Google Play Developer Console. There are no comments attached on how to reliably reproduce this crash.

Expected behavior

No crash

Actual behavior

The app crashes.

It looks like the database is accessed when it had already been closed. Currently there are two places where we close the database:

1. https://github.com/thunderbird/thunderbird-android/blob/ba5a42ec8b764c1b1f1f55a4fd7a58c2191a0d54/legacy/core/src/main/java/com/fsck/k9/mailstore/LockableDatabase.java#L216
2. https://github.com/thunderbird/thunderbird-android/blob/ba5a42ec8b764c1b1f1f55a4fd7a58c2191a0d54/legacy/core/src/main/java/com/fsck/k9/mailstore/LockableDatabase.java#L335

Further investigation is needed on what needs to happen exactly in order to reproduce this crash. It looks like a race condition to me.

Logs

Exception java.lang.IllegalStateException:
  at android.database.sqlite.SQLiteClosable.acquireReference (SQLiteClosable.java:58)
  at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory (SQLiteDatabase.java:1710)
  at android.database.sqlite.SQLiteDatabase.rawQuery (SQLiteDatabase.java:1671)
  at com.fsck.k9.storage.messages.CheckFolderOperations.hasPushEnabledFolder$lambda$4 (CheckFolderOperations.kt:37)
  at com.fsck.k9.mailstore.LockableDatabase.execute (LockableDatabase.java:169)
  at com.fsck.k9.storage.messages.CheckFolderOperations.hasPushEnabledFolder (CheckFolderOperations.kt:36)
  at com.fsck.k9.storage.messages.K9MessageStore.hasPushEnabledFolder (K9MessageStore.kt:251)
  at com.fsck.k9.mailstore.NotifierMessageStore.hasPushEnabledFolder (NotifierMessageStore.kt)
  at app.k9mail.legacy.mailstore.ListenableMessageStore.hasPushEnabledFolder (ListenableMessageStore.kt)
  at app.k9mail.legacy.mailstore.FolderRepository.hasPushEnabledFolder (FolderRepository.kt:164)
  at com.fsck.k9.controller.push.PushController.getPushAccounts$lambda$6 (PushController.kt:257)
  at kotlin.sequences.FilteringSequence$iterator$1.calcNext (Sequences.kt:171)
  at kotlin.sequences.FilteringSequence$iterator$1.hasNext (Sequences.kt:194)
  at kotlin.sequences.SequencesKt___SequencesKt.toSet (_Sequences.kt:842)
  at com.fsck.k9.controller.push.PushController.getPushAccounts (PushController.kt:258)
  at com.fsck.k9.controller.push.PushController.updatePushers (PushController.kt:167)
  at com.fsck.k9.controller.push.PushController.access$onAlarmPermissionGranted (PushController.kt:34)
  at com.fsck.k9.controller.push.PushController.access$updatePushers (PushController.kt:34)
  at com.fsck.k9.controller.push.PushController$onBackendChanged$1.invokeSuspend (PushController.kt:147)
  at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith (ContinuationImpl.kt:33)
  at kotlinx.coroutines.DispatchedTask.run (DispatchedTask.kt:101)
  at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1145)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:644)
  at java.lang.Thread.run (Thread.java:1012)