android-x86 test job sometimes fails during startup

[jdm]

xcb_connection_has_error() returned true
pulseaudio: pa_context_connect() failed
pulseaudio: Reason: Connection refused
pulseaudio: Failed to initialize PA contextaudio: Could not init `pa' audio driver

command timed out: 1200 seconds without output running ['env', '--unset', 'ANDROID_NDK', '--unset', 'ANDROID_SDK', './mach', 'test-android-startup', '--release'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=1200.232570

[SimonSapin]

For comparison, this is the output of a successful run as it appears in http://build.servo.org/builders/android-x86/builds/63/steps/test/logs/stdio :

xcb_connection_has_error() returned true
pulseaudio: pa_context_connect() failed
pulseaudio: Reason: Connection refused
pulseaudio: Failed to initialize PA contextaudio: Could not init `pa' audio driver
Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.mozilla.servo/.MainActivity }
Assuming --target i686-linux-android
Success
--------- beginning of system
--------- beginning of main
Entering android_main
Creating application thread
JavaScript is running!
emulator: Requested console port 5580: Inferring adb port 5581.
emulator: Cold boot: requested by the user
emulator: INFO: boot completed
emulator: Discarding the changed state: command-line flag
emulator: WARNING: Discarding the changed state (command-line flag).

The relative order of stdout lines v.s. stderr lines is messed up, this is what it looks like when running through SSH:

Assuming --target i686-linux-android
emulator: Requested console port 5580: Inferring adb port 5581.
pulseaudio: pa_context_connect() failed
pulseaudio: Reason: Connection refused
pulseaudio: Failed to initialize PA contextaudio: Could not init `pa' audio driver
emulator: Cold boot: requested by the user
emulator: INFO: boot completed
Success
Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.mozilla.servo/.MainActivity }
--------- beginning of system
--------- beginning of main
Entering android_main
Creating application thread
JavaScript is running!
emulator: Discarding the changed state: command-line flag
emulator: WARNING: Discarding the changed state (command-line flag).

Either way, the PulseAudio-related error messages are present there too so they’re probably not relevant to this failure.

What’s notable in that failed run is the absence of INFO: boot completed or Cold boot: requested by the user. It looks like the emulator is starting, but the emulated system is not for some reason.