[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