Example build: https://build.chromium.org/p/chromium.linux/builders/Android%20Tests%20%28dbg%29/builds/35659

There are a couple of issues:

A. First, the step seems to be trying to run the stack tool on a blacklisted device (0cb844c5032fdbdb) and times out when trying to get properties from the device:


I  110.750s TimeoutThread-4-for-MainThread  [host]> /b/c/b/Android_Tests__dbg_/src/third_party/android_tools/sdk/platform-tools/adb -s 0cb844c5032fdbdb shell '( ( c=/data/local/tmp/cache_token;echo $EXTERNAL_STORAGE;cat $c 2>/dev/null||echo;echo "7f61c9c0-5ecb-11e6-bb7e-d4ae52ce4976">$c &&getprop )>/data/local/tmp/temp_file-ca1aee6de1f86 );echo %$?'
Exception in thread delete_temporary_file(0cb844c5032fdbdb):
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
    self.run()
<snip>
"/b/c/b/Android_Tests__dbg_/src/third_party/catapult/devil/devil/utils/cmd_helper.py", line 273, in GetCmdStatusAndOutputWithTimeout
    raise TimeoutError(output.getvalue())
CommandTimeoutError
https://build.chromium.org/p/chromium.linux/builders/Android%20Tests%20%28dbg%29/builds/35659/steps/stack_tool_for_tombstones/logs/stdio

B. Later, the script eventually dies because no resolved_tombstones were found:

Traceback (most recent call last):
  File "/b/c/b/Android_Tests__dbg_/src/build/android/tombstones.py", line 304, in <module>
    sys.exit(main())
  File "/b/c/b/Android_Tests__dbg_/src/build/android/tombstones.py", line 300, in main
    for line in resolved_tombstones:
TypeError: 'NoneType' object is not iterable

I filed issue 636281 about the blacklisted devices, and will try to send a fix for "B". Hopefully that will help get the bot green.

Not sure whether we should be running the stack tool on blacklisted devices at all. But let's deal with that second.