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Type: Bug
Resolution: Fixed
Priority: Critical
Component/s: android-emulator-plugin
Labels:
None
Environment:
Ubuntu 16.04 64bit
Android SDK revision 25.1.6
Jenkins 2.5 and 1.651.2
Android Emulator Plugin 2.14.1

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Android Emulator plugin fails to correctly shutdown the emulator started for the test, but this fact is not logged in console output:

[android] Starting Android emulator
[android] Erasing existing emulator data...
$ /var/lib/jenkins/tools/android-sdk/tools/emulator -engine classic -ports 5748,5749 -report-console tcp:5832,max=60 -prop persist.sys.language=en -prop persist.sys.country=US -avd hudson_en-US_160_HVGA_android-19 -no-snapshot-load -no-snapshot-save -wipe-data -no-window -no-audio -gpu off
[android] Emulator reported that the console is available on port 5,748
[android] Waiting for emulator to finish booting...
$ /var/lib/jenkins/tools/android-sdk/platform-tools/adb -s emulator-5748 wait-for-device shell getprop init.svc.bootanim
[android] Emulator reported that the startup process is 'stopped'
$ /var/lib/jenkins/tools/android-sdk/platform-tools/adb -s emulator-5748 logcat -v time
[android] Emulator is ready for use (took 23 seconds)
[test2-maremoto-studio] $ /bin/sh -xe /tmp/hudson1987499027468087201.sh
...
[android] Stopping Android emulator
[android] Archiving emulator log
$ /var/lib/jenkins/tools/android-sdk/platform-tools/adb kill-server
Finished: SUCCESS

This leads to

emulator processes continue consuming CPU and RAM

next emulator start fails due to resources remains locked

[android] Starting Android emulator
[android] Erasing existing emulator data...
$ /var/lib/jenkins/tools/android-sdk/tools/emulator -engine classic -ports 5726,5727 -report-console tcp:5861,max=60 -prop persist.sys.language=en -prop persist.sys.country=US -avd hudson_en-US_160_HVGA_android-19 -no-snapshot-load -no-snapshot-save -wipe-data -no-window -no-audio -gpu off
WARNING: SD Card image already in use: /var/lib/jenkins/.android/avd/hudson_en-US_160_HVGA_android-19.avd/sdcard.img
ko:Snapshot storage already in use: /var/lib/jenkins/.android/avd/hudson_en-US_160_HVGA_android-19.avd/snapshots.img
emulator: WARNING: Classic qemu does not support SMP. The hw.cpu.ncore option from your config file is ignored.
emulator: WARNING: userdata image already in use, changes will not persist!

emulator: WARNING: cache image already in use, changes will not persist!
...

The root cause is Google emulator console behavior change: now you MUST authenticate in emulator console before you can issue 'kill' command. This change was introduced about a week ago when Android SDK 25.1.6 was released.

But the Android Emulator plugin can't handle authentication required - it simply issues 'kill' command to the emulator console, and the emulator silently refuses this unauthorized command.

Talking to emulators leaved running by plugin "by-hands" via telnet(1) - shutdowns them successfully:

kaa@AGnb:~$ ps -augxw |grep ^jenkins |grep emulator
jenkins  23511 15.2  4.4 1144460 333832 ?      Sl   12:12   0:34 /var/lib/jenkins/tools/android-sdk/tools/emulator64-x86 -engine classic -ports 5698,5699 -report-console tcp:5839,max=60 -prop persist.sys.language=en -prop persist.sys.country=US -avd hudson_en-US_160_HVGA_android-19 -no-snapshot-load -no-snapshot-save -wipe-data -no-window -no-audio -gpu off
jenkins  23518  0.0  0.0      0     0 ?        Z    12:12   0:00 [emulator64-cras] <defunct>
kaa@AGnb:~$ 

kaa@AGnb:~$ sudo cat /var/lib/jenkins/.emulator_console_auth_token ; echo ""
JDKCEhwZ6jhmnIV3
kaa@AGnb:~$ 

AGnb:~$ 
kaa@AGnb:~$ telnet 127.1 5698
Trying 127.0.0.1...
Connected to 127.1.
Escape character is '^]'.
Android Console: Authentication required
Android Console: type 'auth <auth_token>' to authenticate
Android Console: you can find your <auth_token> in 
'/var/lib/jenkins/.emulator_console_auth_token'
OK
help
Android console command help:

    help|h|?         print a list of commands
    avd              control virtual device execution
    auth             user authentication for the emulator console
    quit|exit        quit control session

try 'help <command>' for command-specific help
OK
avd name
hudson_en-US_160_HVGA_android-19
OK
auth JDKCEhwZ6jhmnIV3
Android Console: type 'help' for a list of commands
OK
help
Android console command help:

    help|h|?         print a list of commands
    event            simulate hardware events
    geo              Geo-location commands
    gsm              GSM related commands
    cdma             CDMA related commands
    crash            crash the emulator instance
    kill             kill the emulator instance
    network          manage network settings
    power            power related commands
    quit|exit        quit control session
    redir            manage port redirections
    sms              SMS related commands
    avd              control virtual device execution
    qemu             QEMU-specific commands
    sensor           manage emulator sensors
    finger           manage emulator finger print

try 'help <command>' for command-specific help
OK
kill
OK: killing emulator, bye bye
Connection closed by foreign host.
kaa@AGnb:~$ ps -augxw |grep ^jenkins |grep emulator
kaa@AGnb:~$

As I can see, lines 584-586 of "src/main/java/hudson/plugins/android_emulator/AndroidEmulator.java" must be patched to issue 'auth' command before 'kill'

        // Stop emulator process
        log(emu.logger(), Messages.STOPPING_EMULATOR());
        boolean killed = emu.sendCommand("kill");

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