[Logcat] Logcat terminated with code 0, signal null
[UiAutomator] UiAutomator exited unexpectedly with code 0, signal null
[debug] [UiAutomator] Moving to state 'stopped'
[debug] [AndroidDriver] Shutting down Android driver
[Appium] Closing session, cause was 'UiAUtomator shut down unexpectedly'
[Appium] Removing session 6ba02a58-410d-42b6-af05-9999781f3bc3 from our master session list
[debug] [ADB] Getting connected devices...
[MJSONWP] Encountered internal error running command: Error: UiAUtomator shut down unexpectedly
    at AndroidBootstrap.callee$2$0$ (../../lib/bootstrap.js:76:44)
    at tryCatch (/usr/local/lib/node_modules/appium/node_modules/._babel-runtime@5.8.24@babel-runtime/regenerator/runtime.js:67:40)
    at GeneratorFunctionPrototype.invoke [as _invoke] (/usr/local/lib/node_modules/appium/node_modules/._babel-runtime@5.8.24@babel-runtime/regenerator/runtime.js:315:22)
    at GeneratorFunctionPrototype.prototype.(anonymous function) [as next] (/usr/local/lib/node_modules/appium/node_modules/._babel-runtime@5.8.24@babel-runtime/regenerator/runtime.js:100:21)
    at invoke (/usr/local/lib/node_modules/appium/node_modules/._babel-runtime@5.8.24@babel-runtime/regenerator/runtime.js:136:37)
    at enqueueResult (/usr/local/lib/node_modules/appium/node_modules/._babel-runtime@5.8.24@babel-runtime/regenerator/runtime.js:185:17)
    at Promise.exports.(anonymous function).target.(anonymous function).function.target.(anonymous function).F (/usr/local/lib/node_modules/appium/node_modules/._core-js@1.2.7@core-js/library/modules/$.export.js:30:36)
    at AsyncIterator.enqueue (/usr/local/lib/node_modules/appium/node_modules/._babel-runtime@5.8.24@babel-runtime/regenerator/runtime.js:184:12)
    at AsyncIterator.prototype.(anonymous function) [as next] (/usr/local/lib/node_modules/appium/node_modules/._babel-runtime@5.8.24@babel-runtime/regenerator/runtime.js:100:21)
    at Object.runtime.async (/usr/local/lib/node_modules/appium/node_modules/._babel-runtime@5.8.24@babel-runtime/regenerator/runtime.js:209:12)
    at UiAutomator.callee$2$0 (../../lib/bootstrap.js:73:64)
    at emitOne (events.js:96:13)
    at UiAutomator.emit (events.js:188:7)
    at UiAutomator.changeState (../../lib/uiautomator.js:85:10)
    at SubProcess.<anonymous> (../../lib/uiautomator.js:47:14)
    at emitTwo (events.js:106:13)
    at SubProcess.emit (events.js:191:7)
    at ChildProcess.<anonymous> (../../lib/teen_process.js:205:14)
    at emitTwo (events.js:106:13)
    at ChildProcess.emit (events.js:191:7)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:204:12)

执行一段时间后设备 adb 服务中断，多次拔插数据线才能再连上，换了多个 appium 版本都有同样的问题

* daemon not running. starting it now on port 5037 *
adb E 43518 809114 usb_osx.cpp:322] Could not open interface: e00002c5
adb E 43518 809114 usb_osx.cpp:284] Could not find device interface
* daemon started successfully *
error: no devices/emulators found