IssueTracker

Can you please send us a test app which can reproduce this ?

Project: platform/frameworks/support
Branch: androidx-master-dev

commit 5975b62cd1f3f170bb82e9761efca40e5e5bfb16
Author: Rahul Ravikumar <rahulrav@google.com>
Date:   Wed Jul 24 12:24:17 2019

    TaskExecutor's background executor is now SerialExecutor.
   
    * This gives us visibility into the number of pending tasks which will
      be important in the next CL.
   
      There is a race condition between the SerialExecutor draining its queue
      of pending tasks and SystemAlarmDispatcher's onAllCommandsCompleted() callback.
      This is because SystemAlarmDispatcher thinks there are no more things to be
      done even though there are pending runnables in the SerialExecutor.
      This CL makes this information available. In the next CL, CommandHandler
      will check for pending runnables in the SerialExecutor queue.
      (b/138238197)
   
    * Fixed TestWorkManagerImpl to use Configuration#getTaskExecutor().
    * Updated unit tests.
   
    Test: Updated unit tests.
    Change-Id: I5f32f1e1ef2563d4598934aed3b61d62a6d6167c

M       work/workmanager-gcm/src/androidTest/java/androidx/work/impl/background/gcm/WorkManagerGcmDispatcherTest.kt
M       work/workmanager-ktx/src/androidTest/java/androidx/work/CoroutineWorkerTest.kt
M       work/workmanager-rxjava2/src/test/java/androidx/work/RxWorkerTest.kt
M       work/workmanager-testing/src/androidTest/java/androidx/work/testing/WorkManagerInitHelperTest.java
M       work/workmanager-testing/src/main/java/androidx/work/testing/InstantWorkTaskExecutor.java
M       work/workmanager-testing/src/main/java/androidx/work/testing/TestWorkManagerImpl.java
M       work/workmanager-testing/src/main/java/androidx/work/testing/WorkManagerTestInitHelper.java
M       work/workmanager/src/androidTest/java/androidx/work/impl/utils/taskexecutor/InstantWorkTaskExecutor.java
M       work/workmanager/src/main/java/androidx/work/impl/utils/SerialExecutor.java
M       work/workmanager/src/main/java/androidx/work/impl/utils/taskexecutor/TaskExecutor.java
M       work/workmanager/src/main/java/androidx/work/impl/utils/taskexecutor/WorkManagerTaskExecutor.java

https://android-review.googlesource.com/1090749
https://goto.google.com/android-sha1/5975b62cd1f3f170bb82e9761efca40e5e5bfb16

There is a 2nd change that fixes the problem.

Project: platform/frameworks/support
Branch: androidx-master-dev

commit 7db27318ea09ae3857a7baebe8dd4e6fa9d16fdc
Author: Rahul Ravikumar <rahulrav@google.com>
Date:   Wed Jul 24 12:50:34 2019

    Ensure SerialExecutor has no more pending tasks.
   
    * We need to ensure this is the case because we might shutdown
      SystemAlarmService without actually completing all the tasks.
   
    Test: Existing unit tests pass. Ran integration tests.
    Fixes: b/138238197
    Change-Id: I72fe2ddb1607995721eae320ce41accad93fee8f

M       work/workmanager/src/main/java/androidx/work/impl/background/systemalarm/SystemAlarmDispatcher.java
M       work/workmanager/src/main/java/androidx/work/impl/utils/SerialExecutor.java

https://android-review.googlesource.com/1090758
https://goto.google.com/android-sha1/7db27318ea09ae3857a7baebe8dd4e6fa9d16fdc