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.