[500] linux:~$ xeyes           
debug1: client_input_channel_open: ctype x11 rchan 3 win 65536 max 16384
debug1: client_request_x11: request from 127.0.0.1 42021
debug1: channel 1: new [x11]
debug1: confirm x11
X Error of failed request:  BadDrawable (invalid Pixmap or Window parameter)
  Major opcode of failed request:  55 (X_CreateGC)
debug1: channel 1: FORCE input drain
  Resource id in failed request:  0x75
  Serial number of failed request:  1
  Current serial number in output stream:  3
[501] linux:~$ debug1: channel 1: free: x11, nchannels 2