Zuul trace obtained by sending `SIGUSR2` which write the dump to the debug.log file P8357
last events:
2019-04-05 20:39:40,514 DEBUG zuul.Scheduler: Run handler sleeping
2019-04-05 20:42:16,006 DEBUG zuul.Gearman: Looking for lost builds
2019-04-05 20:47:16,006 DEBUG zuul.Gearman: Looking for lost builds
2019-04-05 20:52:16,007 DEBUG zuul.Gearman: Looking for lost builds
2019-04-05 20:57:16,007 DEBUG zuul.Gearman: Looking for lost builds
2019-04-05 21:02:16,008 DEBUG zuul.Gearman: Looking for lost builds
2019-04-05 21:07:16,008 DEBUG zuul.Gearman: Looking for lost builds
2019-04-05 21:12:16,009 DEBUG zuul.Gearman: Looking for lost builds
2019-04-05 21:17:16,009 DEBUG zuul.Gearman: Looking for lost builds
2019-04-05 21:22:16,010 DEBUG zuul.Gearman: Looking for lost builds
2019-04-05 21:27:16,010 DEBUG zuul.Gearman: Looking for lost builds
2019-04-05 21:27:50,845 DEBUG zuul.stack_dump: Thread: 140422873605888