means that the system_server process deadlocked or failed to make
> progress for one minute. When that happened, the watchdog also sent a
> SIGQUIT (signal 3) to the system process to cause it to write a stack
> dump of all Dalvik threads to the ANR trace file,
> /data/anr/traces.txt. If you pull that file [or get a bugreport; it's
> included in those] and look at what the system_server process was
> doing at the time that the watchdog fired, you can generally figure
> out why it locked up.
>
> The key thread in question is the system process's main looper thread.
> This is typically called something like "ServerThread" or another
> name including that string.
