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/display.js

@@ -2,7 +2,7 @@ var syrup = require('syrup')
 
 var logger = require('../../../util/logger')
 
-module.exports = syrup()
+module.exports = syrup.serial()
   .dependency(require('./http'))
   .define(function(options, http) {
     var log = logger.createLogger('device:plugins:display')

lib/roles/device/plugins/heartbeat.js

@@ -3,7 +3,7 @@ var syrup = require('syrup')
 var wire = require('../../../wire')
 var wireutil = require('../../../wire/util')
 
-module.exports = syrup()
+module.exports = syrup.serial()
   .dependency(require('../support/push'))
   .define(function(options, push) {
     function heartbeat() {

lib/roles/device/plugins/http.js

@@ -11,7 +11,7 @@ var split = require('split')
 var logger = require('../../../util/logger')
 var devutil = require('../../../util/devutil')
 
-module.exports = syrup()
+module.exports = syrup.serial()
   .dependency(require('../support/adb'))
   .dependency(require('../support/quit'))
   .dependency(require('../resources/remote'))

lib/roles/device/plugins/identity.js

@@ -3,7 +3,7 @@ var syrup = require('syrup')
 var devutil = require('../../../util/devutil')
 var logger = require('../../../util/logger')
 
-module.exports = syrup()
+module.exports = syrup.serial()
   .dependency(require('../support/properties'))
   .dependency(require('./display'))
   .define(function(options, properties, display) {

lib/roles/device/plugins/input.js

@@ -11,7 +11,7 @@ var keyutil = require('../../../util/keyutil')
 var streamutil = require('../../../util/streamutil')
 var logger = require('../../../util/logger')
 
-module.exports = syrup()
+module.exports = syrup.serial()
   .dependency(require('../support/adb'))
   .dependency(require('../support/router'))
   .dependency(require('../support/push'))

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'))

lib/roles/device/plugins/logsender.js

@@ -5,7 +5,7 @@ var logger = require('../../../util/logger')
 var wire = require('../../../wire')
 var wireutil = require('../../../wire/util')
 
-module.exports = syrup()
+module.exports = syrup.serial()
   .dependency(require('../support/push'))
   .dependency(require('../support/quit'))
   .define(function(options, push, quit) {

lib/roles/device/plugins/owner.js

@@ -6,7 +6,7 @@ var wire = require('../../../wire')
 var wireutil = require('../../../wire/util')
 var devutil = require('../../../util/devutil')
 
-module.exports = syrup()
+module.exports = syrup.serial()
   .dependency(require('./identity'))
   .dependency(require('./input'))
   .dependency(require('../support/router'))

lib/roles/device/plugins/shell.js

@@ -5,7 +5,7 @@ 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/push'))

lib/roles/device/plugins/solo.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/sub'))
   .dependency(require('../support/push'))
   .dependency(require('../support/channels'))

lib/roles/device/plugins/stats.js

@@ -4,7 +4,7 @@ var split = require('split')
 var logger = require('../../../util/logger')
 var devutil = require('../../../util/devutil')
 
-module.exports = syrup()
+module.exports = syrup.serial()
   .dependency(require('../support/adb'))
   .dependency(require('../support/quit'))
   .dependency(require('../resources/remote'))

lib/roles/device/plugins/touch.js

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