title: flutter run hangs on adb command
body: <p>I have these emulators in Flutter on linux:</p>
  
  <pre><code>$ flutter emulators
  2 available emulators:
  
  Nexus_5X_API_29_x86 • Nexus 5X API 29 x86 • Google • android
  flutter_emulator    • flutter emulator    • Google • android
  
  To run an emulator, run 'flutter emulators --launch &lt;emulator id&gt;'.
  To create a new emulator, run 'flutter emulators --create [--name xyz]'.
  
  You can find more information on managing emulators at the links below:
    https://developer.android.com/studio/run/managing-avds
    https://developer.android.com/studio/command-line/avdmanager
  </code></pre>
  
  <p>I'm trying to run my code in the <code>flutter_emulator</code>, but it just hangs on an <code>adb</code> command.</p>
  
  <p>When I run <code>flutter run -v</code>, it hangs.</p>
  
  <pre><code>[  +32 ms] executing: [/home/skuzzymiglet/flutter/] git -c log.showSignature=false log -n 1 --pretty=format:%H
  [  +42 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
  [        ] 0b8abb4724aa590dd0f429683339b1e045a1594d
  [        ] executing: [/home/skuzzymiglet/flutter/] git describe --match v*.*.* --first-parent --long --tags
  [   +7 ms] Exit code 0 from: git describe --match v*.*.* --first-parent --long --tags
  [        ] v1.12.13+hotfix.8-0-g0b8abb472
  [  +10 ms] executing: [/home/skuzzymiglet/flutter/] git rev-parse --abbrev-ref --symbolic @{u}
  [   +9 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
  [        ] origin/stable
  [        ] executing: [/home/skuzzymiglet/flutter/] git ls-remote --get-url origin
  [  +12 ms] Exit code 0 from: git ls-remote --get-url origin
  [        ] https://github.com/flutter/flutter.git
  [  +72 ms] executing: [/home/skuzzymiglet/flutter/] git rev-parse --abbrev-ref HEAD
  [  +10 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
  [        ] stable
  [ +173 ms] executing: /opt/android-sdk/platform-tools/adb devices -l
  [  +11 ms] Exit code 0 from: /opt/android-sdk/platform-tools/adb devices -l
  [        ] List of devices attached
             emulator-5554          device product:sdk_gphone_x86 model:Android_SDK_built_for_x86 device:generic_x86
             transport_id:1
  [  +27 ms] /opt/android-sdk/platform-tools/adb -s emulator-5554 shell getprop
  (hangs)
  </code></pre>
  
  <p>From <code>strace</code>, it just stops.</p>