Android Studio 通过 git update 或者 pull 的时候出错,log 如下：

  Couldn't save uncommitted changes.

  Tried to save uncommitted changes in stash before Update, but failed with an error.

  stash file://D:/github/rxAndroid:       0 [main] us 0 init_cheap: VirtualAlloc pointer is null, Win32 error 487

  AllocationBase 0x0, BaseAddress 0x68570000, RegionSize 0x1A0000, State 0x10000

  C:\Program Files (x86)\Git\bin\sh.exe: *** Couldn't reserve space for cygwin's heap, Win32 error 0

* 相关问题：Git Extensions: Win32 error 487: Couldn't reserve space for cygwin's heap, Win32 error 0

解决办法： system reboot (系统重启)