Apparently it dies when it tries to start pd-gui.tcl in s_inter.c. Parent pd process continues while child process is trying to pull up the gui and eventually fails with the X Error.
/bin/sh -c 'TCL_LIBRARY="./lib/tcl/library" TK_LIBRARY="./lib/tk/library" /usr/local/bin/wish8.6 "./tcl/pd-gui.tcl" 1127'
X Error of failed request: BadLength (poly request too large or internal Xlib length error)
Major opcode of failed request: 18 (X_ChangeProperty)
Serial number of failed request: 68
Current serial number in output stream: 70
Note: The specified TCL_LIBRARY and TK_LIBRARY folders don't exist in my installation, but even when creating those links it fails. Noteworthy, the screenshot from IOhannes shows the same command line with -verbose execution.
Not sure what to make of it.