It seems that it's simply impossible to run too many things in parallel over ADB on a single device. Really weird stuff happening, like completely unrelated shell calls using files created by other shell calls. Switch back to serial implementation.

lib/roles/device/plugins/logcat.js

@@ -4,7 +4,7 @@ var logger = require('../../../util/logger')
 var wire = require('../../../wire')
 var wireutil = require('../../../wire/util')
 
-module.exports = syrup()
+module.exports = syrup.serial()
   .dependency(require('../support/adb'))
   .dependency(require('../support/router'))
   .dependency(require('../support/quit'))