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Subject: Cygwin/X fails post Windows 10 version 1909
Thread-Topic: Cygwin/X fails post Windows 10 version 1909
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Date: Wed, 19 May 2021 18:03:55 +0000
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From: "Galbraith, Randy via Cygwin" <cygwin AT cygwin DOT com>
Reply-To: "Galbraith, Randy" <regalbraith AT cvshealth DOT com>
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Hi Everyone.

Following a Windows 10 version 1909 update Cygwin/X fails to start. It ends with:

(--) 16 mouse buttons found
(--) Setting autorepeat to delay=500, rate=31
xinit: giving up
xinit: unable to connect to X server: Connection refused
xinit: server error

[1]+  Exit 1                  startx -- :1 -multiwindow -clipboard

If I run XWin under gdb with xorg-server-debuginfo package installed I can see this stack trace:

Thread 1 "XWin" received signal ?, Unknown signal.
0x00007ffa99383b19 in RaiseException ()
   from /cygdrive/c/WINDOWS/System32/KERNELBASE.dll
(gdb) bt
#0  0x00007ffa99383b19 in RaiseException ()
   from /cygdrive/c/WINDOWS/System32/KERNELBASE.dll
#1  0x00007ffa97662086 in ?? ()
   from /cygdrive/c/Program Files/Citrix/ICAService/cxinjime64.dll
#2  0x00007ffa97661afd in ?? ()
   from /cygdrive/c/Program Files/Citrix/ICAService/cxinjime64.dll
#3  0x00007ffa97661695 in ?? ()
   from /cygdrive/c/Program Files/Citrix/ICAService/cxinjime64.dll
#4  0x000000010040df3e in winConfigKeyboard (pDevice=pDevice AT entry=0x80027d720)
    at ../hw/xwin/winconfig.c:274
#5  0x0000000100410f36 in winKeybdProc (pDeviceInt=0x80027d720,
    iState=<optimized out>) at ../hw/xwin/winkeybd.c:99
#6  0x0000000100469bc7 in ActivateDevice (dev=dev AT entry=0x80027d720,
    sendevent=sendevent AT entry=1 '\001') at ../dix/devices.c:576
#7  0x000000010046d8bd in InitAndStartDevices () at ../dix/devices.c:762
#8  0x0000000100479f8f in dix_main (argc=2, argv=0xffffcc50,
    envp=<optimized out>) at ../dix/main.c:251
#9  0x0000000180049efd in dll_crt0_1 ()
    at /usr/src/debug/cygwin-3.2.0-1/winsup/cygwin/dcrt0.cc:1028
#10 0x0000000180047856 in _cygtls::call2 (this=0xffffce00,
    func=0x180048d30 <dll_crt0_1(void*)>, arg=0x0, buf=buf AT entry=0xffffcdf0)
    at /usr/src/debug/cygwin-3.2.0-1/winsup/cygwin/cygtls.cc:40
#11 0x0000000180047904 in _cygtls::call (func=<optimized out>,
--Type <RET> for more, q to quit, c to continue without paging--
    arg=<optimized out>)
    at /usr/x86_64-pc-cygwin/sys-root/usr/include/w32api/psdk_inc/intrin-impl.h:790
#12 0x0000000000000000 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(gdb)

The ICA reference reflects my Citrix connection to a virtual Windows 10 desktop. I am working in a corporate setting however I do have admin rights to this virtual machine. Based on "connection refused" my hypothesis was our Windows 1909 push may have blocked ports Xwin is using. If there are specific Windows Defender Firewall rules that are required I would be happy to put them in. The bit of firewall setup I've tried thus far has not helped. This backtrace though makes me think this may be a keyboard configuration issue.

Any advice and guidance on how to debug this problem will be greatly appreciated. Several on our development team rely on Cygwin/X and are rather unhappy to now be restricted to command line tools until we can get this resolved.

Kind regards,
-Randy Galbraith


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