https://luci-milo.appspot.com/buildbot/chromeos/winky-paladin/1598

The HWTest times out "normally":

  05-12-2017 [10:40:57] Suite job is finished.
  Suite timed out. Started on 05-12-2017 [09:05:25], timed out on 05-12-2017 [10:40:57]

But none of the tests ever got run.  The suite logs contain:

05/12 09:06:15.922 DEBUG|     dynamic_suite:0606| Waiting on suite.
05/12 09:11:48.501 INFO |        server_job:0184| START	----	winky-paladin/R60-9544.0.0-rc3/suite_attr_wrapper/platform_DMVerityBitCorruption	timestamp=1494605508	localtime=May 12 09:11:48	
05/12 09:11:48.501 INFO |        server_job:0184| 	ABORT	----	winky-paladin/R60-9544.0.0-rc3/suite_attr_wrapper/platform_DMVerityBitCorruption	timestamp=1494605508	localtime=May 12 09:11:48	
05/12 09:11:48.501 INFO |        server_job:0184| END ABORT	----	winky-paladin/R60-9544.0.0-rc3/suite_attr_wrapper/platform_DMVerityBitCorruption	timestamp=1494605508	localtime=May 12 09:11:48	
< ...snip... >
05/12 09:11:52.451 INFO |        server_job:0184| START	----	winky-paladin/R60-9544.0.0-rc3/suite_attr_wrapper/security_ptraceRestrictions	timestamp=1494605512	localtime=May 12 09:11:52	
05/12 09:11:52.452 INFO |        server_job:0184| 	ABORT	----	winky-paladin/R60-9544.0.0-rc3/suite_attr_wrapper/security_ptraceRestrictions	timestamp=1494605512	localtime=May 12 09:11:52	
05/12 09:11:52.453 INFO |        server_job:0184| END ABORT	----	winky-paladin/R60-9544.0.0-rc3/suite_attr_wrapper/security_ptraceRestrictions	timestamp=1494605512	localtime=May 12 09:11:52	
05/12 10:37:25.680 ERROR|                db:0024| 10:37:25 05/12/17: An operational error occurred during a database operation: (2006, 'MySQL server has gone away'); retrying, don't panic yet
05/12 10:37:58.147 INFO |        server_job:0184| START	----	winky-paladin/R60-9544.0.0-rc3/suite_attr_wrapper/security_SymlinkRestrictions	timestamp=1494610678	localtime=May 12 10:37:58	
05/12 10:37:58.147 INFO |        server_job:0184| 	ABORT	----	winky-paladin/R60-9544.0.0-rc3/suite_attr_wrapper/security_SymlinkRestrictions	timestamp=1494610678	localtime=May 12 10:37:58	
05/12 10:37:58.148 INFO |        server_job:0184| END ABORT	----	winky-paladin/R60-9544.0.0-rc3/suite_attr_wrapper/security_SymlinkRestrictions	timestamp=1494610678	localtime=May 12 10:37:58	

It looks like jobs were getting aborted almost immediately, and then the suite job hangs on the MySQL connection