IRAM-FA-004439+admin-local@IRAM-FA-004439 ~
$ gdb --args /usr/bin/XWin -multiwindow
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Reading symbols from /usr/bin/XWin...Reading symbols from /usr/lib/debug//usr/bi
n/XWin.exe.dbg...Can't read data for section '.debug_frame' in file '/usr/lib/de
bug/usr/bin/XWin.exe.dbg'
(gdb) handle SIGSYS nostop
Signal        Stop      Print   Pass to program Description
SIGSYS        No        Yes     Yes             Bad system call
(gdb) r
Starting program: /usr/bin/XWin -multiwindow
[New Thread 5852.0xc88]
[New Thread 5852.0x1a0c]
[New Thread 5852.0xcec]
[New Thread 5852.0x1548]
[New Thread 5852.0x50c]
[New Thread 5852.0x4e0]
[Thread 5852.0x4e0 exited with code 1]
[Thread 5852.0x1a0c exited with code 1]
[Thread 5852.0x50c exited with code 1]
[Thread 5852.0xcec exited with code 1]
[Inferior 1 (process 5852) exited with code 01]
(gdb) bt full
No stack.
(gdb) q

IRAM-FA-004439+admin-local@IRAM-FA-004439 ~
$ cat /var/log/xwin/XWin.0.log
Welcome to the XWin X Server
Vendor: The Cygwin/X Project
Release: 1.17.1.0
OS: CYGWIN_NT-6.1-WOW IRAM-FA-004439 1.7.35(0.287/5/3) 2015-03-04 12:07 i686
OS: Windows 7 Service Pack 1 [Windows NT 6.1 build 7601] (WoW64)
Package: version 1.17.1-2 built 2015-02-23

XWin was started with the following command line:

/usr/bin/XWin -multiwindow

ddxProcessArgument - Initializing default screens
winInitializeScreenDefaults - primary monitor w 1920 h 1200
winInitializeScreenDefaults - native DPI x 96 y 96
_XSERVTransSocketUNIXCreateListener: ...SocketCreateListener() failed
_XSERVTransMakeAllCOTSServerListeners: server already running
(EE) Fatal server error:
(EE) Cannot establish any listening sockets - Make sure an X server isn't alread
y running(EE)
[ 17451.691] (EE) Server terminated with error (1). Closing log file.