ECM doesn't work on Android Jelly Bean when Hotpluged

Looks like ECM is in, but I'm getting an error on Origen (https://android-build.linaro.org/builds/~linaro-android/origen-jb-gcc47-samsunglt-stable-blob/#build=41)

Here's the error I see:

I/EthernetManager( 2919): Init Ethernet Manager, service:
android.net.ethernet.IEthernetManager$Stub$Proxy@a69527c0
D/dalvikvm( 2919): GC_CONCURRENT freed 135K, 9% free 5872K/6407K,
paused 14ms+22ms, total 75ms
W/ResourceType( 2919): getEntry failing because entryIndex 129 is
beyond type entryCount 3
I/EthenetEnabler( 2919): Show configuration dialog true1
D/AndroidRuntime( 2919): Shutting down VM
W/dalvikvm( 2919): threadid=1: thread exiting with uncaught exception
(group=0xa632d300)
E/AndroidRuntime( 2919): FATAL EXCEPTION: main
E/AndroidRuntime( 2919): java.lang.NullPointerException
E/AndroidRuntime( 2919): at
com.android.settings.ethernet.EthernetConfigDialog.handle_saveconf(EthernetConfigDialog.java:152)
E/AndroidRuntime( 2919): at
com.android.settings.ethernet.EthernetConfigDialog.onClick(EthernetConfigDialog.java:180)
E/AndroidRuntime( 2919): at
com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166)
E/AndroidRuntime( 2919): at
android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 2919): at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime( 2919): at
android.app.ActivityThread.main(ActivityThread.java:4745)
E/AndroidRuntime( 2919): at
java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 2919): at
java.lang.reflect.Method.invoke(Method.java:511)
E/AndroidRuntime( 2919): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
E/AndroidRuntime( 2919): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
E/AndroidRuntime( 2919): at dalvik.system.NativeStart.main(Native Method)
W/ActivityManager( 2534): Force finishing activity
com.android.settings/.Settings
W/ActivityManager( 2534): Activity pause timeout for
ActivityRecord{a6b78858 com.android.settings/.Settings}
I/Process ( 2919): Sending signal. PID: 2919 SIG: 9
W/InputDispatcher( 2534): channel 'a6aea190
com.android.settings/com.android.settings.Settings (server)' ~
Consumer closed input channel or an error occurred. events=0x9
E/InputDispatcher( 2534): channel 'a6aea190
com.android.settings/com.android.settings.Settings (server)' ~ Channel
is unrecoverably broken and will be disposed!
W/InputDispatcher( 2534): Attempted to unregister already unregistered
input channel 'a6aea190
com.android.settings/com.android.settings.Settings (server)'
I/WindowManager( 2534): WINDOW DIED Window{a6aea190
com.android.settings/com.android.settings.Settings paused=false}
I/ActivityManager( 2534): Process com.android.settings (pid 2919) has died.
W/InputDispatcher( 2534): channel 'a6b180b8 Configure Ethernet device
(server)' ~ Consumer closed input channel or an error occurred.
events=0xd
E/InputDispatcher( 2534): channel 'a6b180b8 Configure Ethernet device
(server)' ~ Channel is unrecoverably broken and will be disposed!
W/InputDispatcher( 2534): Attempted to unregister already unregistered
input channel 'a6b180b8 Configure Ethernet device (server)'
I/WindowManager( 2534): WINDOW DIED Window{a6b180b8 Configure Ethernet
device paused=false}
W/WindowManager( 2534): Failed looking up window
W/WindowManager( 2534): java.lang.IllegalArgumentException: Requested
window android.os.BinderProxy@a6a521d0 does not exist
W/WindowManager( 2534): at
com.android.server.wm.WindowManagerService.windowForClientLocked(WindowManagerService.java:7640)
W/WindowManager( 2534): at
com.android.server.wm.WindowManagerService.windowForClientLocked(WindowManagerService.java:7631)
W/WindowManager( 2534): at
com.android.server.wm.WindowState$DeathRecipient.binderDied(WindowState.java:854)
W/WindowManager( 2534): at
android.os.BinderProxy.sendDeathNotice(Binder.java:449)
W/WindowManager( 2534): at dalvik.system.NativeStart.run(Native Method)
I/WindowState( 2534): WIN DEATH: null
W/WindowManager( 2534): Failed looking up window
W/WindowManager( 2534): java.lang.IllegalArgumentException: Requested
window android.os.BinderProxy@a68a2b98 does not exist
W/WindowManager( 2534): at
com.android.server.wm.WindowManagerService.windowForClientLocked(WindowManagerService.java:7640)
W/WindowManager( 2534): at
com.android.server.wm.WindowManagerService.windowForClientLocked(WindowManagerService.java:7631)
W/WindowManager( 2534): at
com.android.server.wm.WindowState$DeathRecipient.binderDied(WindowState.java:854)
W/WindowManager( 2534): at
android.os.BinderProxy.sendDeathNotice(Binder.java:449)
W/WindowManager( 2534): at
com.android.server.SystemServer.init1(Native Method)
W/WindowManager( 2534): at
com.android.server.SystemServer.main(SystemServer.java:951)
W/WindowManager( 2534): at
java.lang.reflect.Method.invokeNative(Native Method)
W/WindowManager( 2534): at
java.lang.reflect.Method.invoke(Method.java:511)
W/WindowManager( 2534): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
W/WindowManager( 2534): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
W/WindowManager( 2534): at dalvik.system.NativeStart.main(Native Method)
I/WindowState( 2534): WIN DEATH: null
W/ActivityManager( 2534): Activity destroy timeout for
ActivityRecord{a6b78858 com.android.settings/.Settings}